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Pre-10.0 Changelog

See the newer changelog for newer revisions.

9.6.8 (2022-10-31)

Full Changelog

We expect this release to ship in the DevTools of Chrome 109, and to PageSpeed Insights within 2 weeks.

Core

deprecations: use translated strings from devtools repo (#13961)
network-request: backport rendererStartTime (#14481)

9.6.7 (2022-09-01)

Full Changelog

This is an npm-only release. We have no plans to release this specific version to DevTools or PSI, but the changes will be rolled up into the next release in those clients.

Core

core(trace-elements): include LCP type in artifact (#14344)
core: add priority to network-requests debug audit (#14340)

9.6.6 (2022-08-16)

Full Changelog

We expect this release to ship in the DevTools of Chrome 106, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Steven @styfle

Core

unsized-images: ignore non-network SVGs (#13737)

Deps

upgrade csp-evaluator (#14281)

9.6.5 (2022-08-01)

Full Changelog

This is an npm-only release and affects only the raw JSON report. We have no plans to release this specific version to DevTools or PSI, but the changes will be rolled up into the next release in those clients.

Core

core(network-requests): include starting timestamp as debug data (#14253)
core: use trace time origin for main-thread-task time origin (#14252)

9.6.4 (2022-07-26)

Full Changelog

We expect this release to ship in the DevTools of Chrome 106, and to PageSpeed Insights within 2 weeks.

Deps

lighthouse-stack-packs: upgrade to 1.8.2 (#14218)

Clients

lr: expose listenForStatus (#14024)

Misc

misc: keep scripts package.json in npm (#14239)

9.6.3 (2022-06-28)

Full Changelog

Core

network-requests: add frame and preload debug data (#14161)
preload-lcp-image: enrich debugData (#14155)

9.6.2 (2022-06-01)

Full Changelog

We expect this release to ship in the DevTools of Chrome 104, and to PageSpeed Insights within 2 weeks.

Core

driver: fix legacy runner hanging oopifs in some cases (#14074)

Report

avoid really slow regexes for data urls (#13791)

Clients

psi: expose the swapLocale types (#14062)

Tests

smoke: fix ToT node id failures (#14077)
devtools: sync web tests (#14061)

Misc

build: fix lightrider report generator bundle (#14031)

9.6.1 (2022-05-11)

Full Changelog

We expect this release to ship in the DevTools of Chrome 103, and to PageSpeed Insights within 2 weeks.

Core

fps: run at the end of timespan/snapshot (#13989)
responsiveness: add element screenshot to INP diagnostic (#13984)
responsiveness: add better INP fallback for old Chrome versions (#13985)

Report

devtools: use absolute positioning for overlay (#13988)

Tests

use origin-agent-cluster to actually test oopifs (#13777)

9.6.0 (2022-05-09)

Full Changelog

We expect this release to ship in the DevTools of Chrome 103, and to PageSpeed Insights within 2 weeks.

New Audits

The new performance metric Interaction to Next Paint (INP) assesses responsiveness by measuring the latency of interactions throughout the page lifecycle. INP can be measured using Lighthouse timespan mode accessible through user flows or the new DevTools panel. (#13917, #13917

Core

extract BootupTime task summary methods (#13971)
css-usage: fetch stylesheet contents immediately after discovery (#13887)
installability-errors: add url scheme error (#13846)
installable-manifest: always run InstallabilityErrors in legacy mode (#13622)
responsiveness: use new EventTiming trace event format (#13979)
responsiveness: use raw trace event (#13970)
trace: use tracing-started event for frame tree info (#13913)
trace: add PrePaint event, renamed from UpdateLayerTree (#13950)
trace-processor: ignore navigationStart with falsy document url (#13848)
resolve redirected script records (#13751)
deprecations: drop compat for ConsoleMessages (#13893)
deprecations: hard-code english strings (1883f7)

Report

hide disclaimer text in timespan (#13931)
psi: stub out locale swapping (#13885)
report: render notApplicable metrics with double dash (#13981)

Deps

upgrade third-party-web (#13873)
update to third-party-web 0.15.0 (#13804)
axe-core: upgrade to 4.4.1 (#13814)
js-library-detector: upgrade to 6.5.0 (#13969)
lighthouse-stack-packs: upgrade to 1.8.1 (#13862)
snyk: update snyk snapshot (#13823, #13880)
lodash: use individual lodash modules to reduce bundle size (#13914)
puppeteer: upgrade to 13.7.0 (#13657)

Tests

upgrade devtools web tests deps, use python3 (#13782)
update create-test-trace utility (#13942)
rebaseline webtests (#13963)
smoke: remove old chrome version checks (#13903)
smoke: support full chrome version for pruning (#13896)

9.5.0 (2022-03-09)

Full Changelog

We expect this release to ship in the DevTools of Chrome 101, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Marc Hassan @mhassan1

Core

full-page-screenshot: leave emulated width unchanged (#13643)
inspector-issues: update sameSiteCookie to cookie (#13708)
script-treemap-data: correct value for size (#13716)
lighthouse-logger: convert to ES modules (#13720)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

separate audit phase for flows (#13623)
use frame url in gather context (#13699)
add logLevel to config context (#13681)
user-flow: audit flow from artifacts json (#13715)

Report

fix timespan/snapshot sticky header (#13732)

Deps

lodash: replace lodash per-method packages with full lodash (#13695)
snyk: update snyk snapshot (#13731 #13712)

Clients

convert devtools and lightrider entries to ES modules (#13722)

Tests

add more cases for oopif smoke test (#13705)
devtools: add yarn install timeout (#13717)
devtools: update Lighthouse sniffer for smokes (#13693)
devtools: navigation web test (#13673)
smoke: enable more devtools smoke tests (#13624)
smoke: add _excludes and _runner (#13707)

Misc

support --chrome-flags in run devtools script (#13625)

9.4.0 (2022-02-16)

Full Changelog

We expect this release to ship in the DevTools of Chrome 100, and to PageSpeed Insights within 2 weeks.

Notable Changes

Allow auditing of navigations triggered by user interactions in user flows. See our user flow docs for more info. (#13496)

Core

a11y: change link in category description to web.dev (#13638)
full-page-screenshot: wait for doubleraf, network quiet (#13663)
hreflang: remove eval, import axe valid-langs.js directly (#13385)
inputs: refactor form-elements gatherer (#13662, #13671)
page-functions: set style in getOuterHTMLSnippet without violating CSP (#13636)
runner: independent gather and audit functions (#13569)
uses-long-cache-ttl: ignore stale-while-revalidate (#13612)

Report

add options onPrintOverride and onSaveFileOverride (#13529)
add options disableFireworks and disableDarkMode (#13649)
add onViewTrace to renderer options (#13528)
remove pausing fireworks on click (#13650)
fix fireworks (#13635)

Deps

sentry: move from raven to @sentry/node (#9325)
snyk: update snyk snapshot (#13669, #13644, #13616)

Tests

use simpler assertion in report-renderer-axe-test.js (#13658)
fix single node a11y tests (#13626)
devtools: sync (#13656)
devtools: update report resource names (#13615)
smoke: test array _includes and lhr.timing (#13619)

Misc

temporarily remove brendan from triage rotation (#13618)

9.3.1 (2022-01-31)

Full Changelog

Report

disable fireworks with flag (#13610)

9.3.0 (2022-01-31)

Full Changelog

We expect this release to ship in the DevTools of Chrome 100, and to PageSpeed Insights within 2 weeks.

Core

preload-lcp-image: enable audit (#13599)
ensure good and average scores start exactly at control points (#13559)
fr: don't throw on unknown --only-categories value (#13499)
inspector-issues: collect all issue types (#13462, #13603, #13595)
object-alt: remove md syntax around "alt" (#13517)
runner: asset manager helper (#13519)

CLI

remove update-notifier (#13588)
asset-saver: end devtoolsLog with a newline (#13566)

Report

allow client to configure how save-html is implemented (#13518)

Deps

update various runtime deps (#13483)
update various devDeps (#13485)
update robots-parser to latest (#13554)
update transitive deps to quiet vulnerability alerts (#13538)
lighthouse-stack-packs: upgrade to 1.7.0 (#13604)
snyk: update snyk snapshot (#13498, #13598)
yargs: upgrade to 17.3.1 (#13590)
yargs-parser: upgrade to 21.0.0 (#13597)

Clients

use minimal 'url' polyfil instead of url-shim (#13545)
devtools: add FR runners to DevTools entry (#13593)

I18n

import (#13602)

Docs

update devtools panel throttling details (#13504)

Tests

add snapshot tests for cli-flags.js (#13596)
tweak some CI job names for clarity (#13549)
split devtools ci into build, web-tests and smoke jobs (#13546)
more targeted caching for devtools build (#13540)
run most smoke tests on devtools (#13456)
clean up and add comments to cdt layout test scripts (#13471)
devtools: ensure WebSQL table is populated (#13579)

Misc

add web.dev and other option to bug template (#13537)
use codemod for optional chaining (#13503)
build: fix build-smokehouse-bundle build (#13500)
build: remove empty devtools report resources (#13601)
build: set correct exit code when build scripts fail (#13459)
git3po: only install latest git3po if out of date (#13515)

9.2.0 (2021-12-15)

Full Changelog

We expect this release to ship in the DevTools of Chrome 99, and to PageSpeed Insights within 2 weeks.

Notable Changes

move no-unload-listeners to perf category (#13497)

Core

font-size: fix CSS selector regex (#13455)
fcp: handle negative request endTime (#13452)
legacy-javascript: update polyfilling, drop some signals (#13482, #13442)
cache fetch to avoid bad polyfills (#13476)
check equality of computed artifacts using dependency keys (#13430)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

compute timespan saving with observed throughput (#13478)
option to skip about:blank jumps (#13375)

Report

psi: update styles for tighter fit in narrow viewports (#13355)

Deps

bump eslint and related items (#13484)
axe-core: upgrade to 4.3.5 (#13441)

Tests

smoke: fix chromestatus url (#13475)
split smoke tests into one test per file (#13461)
fix devtools build command (#13457)
move sharding higher so smokehouse-bundle can also shard (#13387)
port axe test to pptr (#13450)

Misc

build: build test flow report to same path as sample-reports (#13324)
treemap: add lang to html tag (#13454)

9.1.0 (2021-11-24)

Full Changelog

We expect this release to ship in the DevTools of Chrome 98, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

@whitep4nth3r
Adam Read @adamread

Notable Changes

If using Next.js, you will now see advice specific to it in some audits (#13424)

Core

canonical: remove cross-origin check (#13412)
add original location to most usages of source-location (#13393)
mindfully order properties in the lhr (#13418)
ensure log-normal score is always in correct range (#13392)
installable-manifest: pipeline-restarted check (#13365)

Report

remove margin when saving html in standalone report (#13409)
consistent red display text (#13391)
treemap: correct percentages when 0 bytes JS (#13382)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

rebaseline sample (#13358)
report api (#13374)

Deps

remove browserify (#13417)
update to typescript 4.5 (#13399)
snyk: update snyk snapshot (#13388)

Clients

devtools: remove report.css (#13377)
viewer: add support for flow reports (#13260)

I18n

import (#13427)

Docs

example to save flow as json (#13415)
throttling: clarify throttle npm name (#13371)

Tests

fix undefined HTMLInputElement in bundle-test (#13421)
make inline-fs-test not reliant on cwd (#13420)
increase timeout for axe test (#13386)

Misc

build: replace browserify with rollup (#13416, #13406, #13407, #13408)
build: prevent over optimization of computeBenchmarkIndex (#13366)
treemap: remove postMessage. refactor options input (#13356)

9.0.0 (2021-11-15)

Full Changelog

We expect this release to ship in the DevTools of Chrome 98, and to PageSpeed Insights within 2 weeks.

See the What's new in Lighthouse 9.0 blog post. Continue for the changelog.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Sergii Bondarenko @BR0kEN-
Prerana Nawar @prerana1821

Notable Changes

[BREAKING] move to minimum Node 14 (#13243)
a11y: add relatedNodes to accessibility audits (#13193)

Removed Audits

[BREAKING] appcache-manifest: remove audit (#13287)
[BREAKING] external-anchors-use-rel-noopener: remove audit (#13298)
[BREAKING] remove the redirect pass and redirects-http audit (#12643)

Preview: Audit User Flows

Report of a Lighthouse User Flow. Shows the overivew page, with summaries of 4 subreports.

Lighthouse now offers auditing user flows, scripted with Puppeteer, via the Node CLI. This means you can now audit a page beyond its initial load. See the Lighthouse user flows blog post for more.

Core

fix launching chrome in node 17 (#13301)
reduce image hotlinking in the report (#13185)
emulation: set client-hints metadata when spoofing the UA (#13341)
emulation: bump chrome version to m98 (#13340)
config: use abbreviation for pwa category title (#13270)
deprecations: use inspector issues (#13342)
avoid fatal errors when collecting base artifacts (#13312)
[BREAKING] errors-in-console: remove url property from items (#13286)
[BREAKING] image-size-responsive: remove elidedUrl, elide url property instead (#13226)
[BREAKING] image-elements: remove mimeType from artifact (#13265)

Report

introduce the new report api, add dom.rootEl (#13277, #13279, #13361)
make denser. changes to typography, group descriptions, more (#13249)
display final screenshot prominently (#13123)
redesign runtime settings (#13125, #13350)
help-dialog: remove timespan SEO (#13354)
order metrics by row (#13328)
sort audits by weight (#13053)
translate newly added report strings (#13308)
[BREAKING] group perf audits by details type. change the meaning of an audit whose group is not defined–before no group implied an audit would not be renderered, but now an explicit hidden group is used (#13241, #13310)
[BREAKING] pwa: remove renderScoreGauge, replaced with renderCategoryScore (#13269)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

handle 0 throughput in timespan (#13323)
clone default categories to avoid modification (#13337)
add timespan support to h2 (#12814)
report: remove smooth scrolling (#13317)
report: network throttling settings (#13305)
report: use filmstrip thumbnail in navigation (#13283)
report: fix report anchors (#13233)
report: full page screenshot renderer (#13276)
report: category tooltip highest impact (#13230)
report: import lhr strings (#13215)
report: i18n formatter (#13190)
report: mock styles (#13220)

Deps

bump lighthouse-plugin-publisher-ads (#13339)
deps: update chrome-launcher to 0.15.0 (#13353)

Clients

devtools: only use locales that have locale files to download (#13214)
psi: retire prepareLabData, reuse standard report rendering (#13229)

I18n

import (#13360)
add better support for the default locale in bundles (#13211)

Tests

eslint: add export rule (#13282)
longer timeout for installability errors check (#13297)
ignore .tmp directory in jest modules (#13285)
add cdt folders to devtools test cache buster (#13268)
update devtools default branch to 'main' (#13266)
ci tests should include all files (#13235)
report: throw on axe error (#13234)
flow: puppeteer test (#13281)

Misc

publish: include the report bundle in npm package (#13349)
build: create inline-fs rollup plugin to replace brfs (#13232, #13240, #13248, #13272, #13275, #13278, #13280)
build: use rollup to build lighthouse-core bundles (#12771)
build: call close method on rollup builds (#13307)
build: use prepack script to build report (#13261)
build: do not assign runBundledLighthouse in devtools bundle (#13311)
build: use cross platform sed for devtools script (#13242)
preserve error stack when using promise timeout (#13333)
support old devtools in yarn run-devtools (#13284)
add report bundles to nightly build (#13222)
rename lighthouse-treemap to treemap (#13246)
rename lighthouse-viewer to viewer (#13247)
simplify release process, run package-test in CI (#13212)
add os to bug report template (#13245)
proto: add throttling and throttling_method (#13309)
revert missing bundle tests (#13289)
fix typo (#13224)

8.6.0 (2021-10-13)

Full Changelog

We expect this release to ship in the DevTools of Chrome 97, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

meehawk @meehawk
Edwin Gustafson @edwingustafson
Yorkie Liu @yorkie

Core

crawlable-anchors: ignore event listeners, validate url (#13105)
full-page-screenshot: fix emulation reset (#13175)
response-compression: add x-content-encoding-over-network (#13176)
share localization between core and report (#13146)
update cdt SourceMap to latest devtools frontend (#13095)
stack-packs: simplify i18n filename lookup (#13133)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

add UserFlow usability improvements (#13139)
add supportedModes filter to categories (#13161)
handle cached timespan records (#13181)
add parity logging (#13114)
animate timespan thumbnail (#13178)
refine snapshot and timespan performance (#13184)
topbar save button (#13109)
elide step name (#13171)
localized sample (#13143)
timeline header (#13128)
add help dialog to explain flows (#13159)
collect i18n strings (#13152)

CLI

add list-locales flag (#12983)
always return correct version (#13130)

Report

move logger styles into js (#13204)
remove href from category score gauge (#13180)
inject report/assets/styles.css via components.js (#13057)
remove smooth scrolling css (#13102)
add lh- prefix to remaining show class (#13203)
handle gauge fragment links in script (#13186)

Clients

psi: include global reports styles in legacy psi rendering (#13151)
viewer: swap locale (#10148, #13192)
viewer: remove devtools disclaimer (#13145)
viewer: add body styles (#13144)
viewer: upgrade to firebase 9 (#13115)
viewer: use access token regardless of firebase auth (#13116)
viewer: use new firebase credentials (#13110)

I18n

import (#13206)

Docs

correct the Node.js version base (#13099)
add user flow docs (#13134)

Tests

smoke: make specific assertions about deprecations (#13191)
update deprecations smoke for M96 (#13179)
make yarn unit run all available unit tests (#13148)
centralize running of docs tests (#13150)
split out axe test (#13142)

Misc

convert lighthouse-core/scripts to ES modules (#13121)
remove patrick from issue assigner (#13194)
set predictable order for sample json timing entries (#13162)
scripts: fix run-devtools sniffing, add error checking (#13163)
ensure psi.espanol sample-report es en espanol (#13160)
add notes about software versions in issue template (#13089)
build: fix smokehouse bundle (#13135)
build: fix vercel deployment by adopting stricter engines grammar (#13183)
build: create rollup-plugins.js helper module (#13122)
build: don't build flow if only --standalone is requested (#13124)

8.5.1 (2021-09-22)

Full Changelog

This is a patch release to fix an issue in the CLI when error reporting has been enabled.

New Contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Yorkie Liu @yorkie

CLI

fix crash with Sentry init (#13104)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

add API for constructing flow result (#13034)
add category tooltips to flow report (#13043)

8.5.0 (2021-09-21)

Full Changelog

We expect this release to ship in the DevTools of Chrome 96, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Konstantin Popov @KonstHardy
Can Umay @canumay

Core

lazy-lcp: fix failureTitle in lcp-lazy-loaded (#13049)
tracing: remove cpu_profiler.hires (#13056)
tsc: add base tsconfig for config inheritance (#13072)
make main tsc compile cacheable (#13069)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

cleanup driver on run completion (#13062)
setup emulation and throttling for timespans (#13058)
support additionalTraceCategories (#13030)
add support for plugins (#13028)
move GatherContext to baseArtifacts (#13033)
preserve traces on failed page load (#13027)
move HostUserAgent/FormFactor back to base artifacts (#12969)
use devtools throttling by default in timespan mode (#13013)
collect OOPIF network data (#12992)
flow: summary sections (#13086)
flow: topbar (#13065)

CLI

convert to ES modules (#13045)

Report

make metric value more prominent in table (#13036)
3p-filter: drop for/id as elements are already nested (#13067)
add gatherMode option to category score (#13029)
add fractional category scores (#13009)

Deps

update to latest @rollup/plugin-typescript (#13075)
snyk: update snyk snapshot (#13019)

Clients

lr: bundle smokehouse as commonjs (#13074)
add canonical link to viewer and treemap (#13032)

Docs

readme: add Peyk to the list of integrations (#13055)

Tests

add FR integration scenarios (#13092)
update SVGOMG expectations (#13088)
restore use of latest node 16 in CI (#13079)
eslint: trailing commas for import/export (#13059)
smokehouse: add flag for test sharding (#13047)
smokehouse: convert to ES modules (#13046)
fix flaky robots smoke failure (#13031)
smoke: upload smokehouse artifacts on failure (#13010)

Misc

build: fix minifyFileTransform stream bug in Node 16 (#13073)
fix typo in lighthouse-treemap/app/src/main.js (#13076)
proto: add i18n.icuMessagePaths (#13068)
remove all FR-COMPAT todos (#13023)

8.4.0 (2021-09-08)

Full Changelog

We expect this release to ship in the DevTools of Chrome 95, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Emmanouil Zoumpoulakis @emzoumpo
Milutin Kristofic @milutin
Bjørn Erik Pedersen @bep
Jerome Cukier @jckr
Saurav Kumar @svkrclg

New Audits

Detect when the LCP element is lazy-loaded. Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint. Learn more (#12838)

Core

network-request: identify filesystem resources as non-network (#12970)
viewport: add viewport audit as perf diagnostic (#12972)
csp-evaluator: bump package version (#12990)
config: keep full-page-screenshot in skipAudits case (#12645)
large-javascript-libraries: delete (#12941)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

collect devtoolsLogs on pageLoadError (#12980)
add config validation (#12945)
align navigation failure behavior (#12862)
add protocol timeout to session (#12913)
parity on Stacks and FullPageSnapshot gatherers (#12907)
http-status-code: navigation only (#13005)
add --debugNavigation setting (#12902)
flow: sidebar mocks (#13002)
flow: embedded lighthouse report (#12989)
flow: summary page (#12973)
flow: navigation sidebar (#12929)
flow: standalone shell report with preact (#12850)

Report

accessible n/a icon (#12984)
split topbar features (#12926)
prefix all classnames with lh- (#12985)
isolate type checking (#12953, #12952, #12951)
use postMessage to open viewer outside devtools (#12927)
better deduping of warnings (#12355)

Deps

snyk: update snyk snapshot (#13001, #12982)
update to typescript 4.4.2 (#12909, #12999)

Clients

lightrider: use iframe fetcher (#13006)
treemap: convert to ES modules (#12892)
viewer: make entire directory use modules (#12975)

Docs

auth: add missing build step in README (#12911)
changelog: fix typo in changelog.md (#12997)
hacking: add links to buildtracker/pr-tracking (#12922)

Tests

avoid node 16.9.0 (#13012)
ci: restore ToT Chromium download (#12943, #12950)
dom: fix node 16 createObjectURL bug (#12935)
eslint: add import/order rule (#12998)
fr: convert screenshot expectations (#12912)
smoke: check for passing robots-txt (#13007)
smoke: fix dbw console error expectation (#13011)
smoke: print command to rerun failures (#12924)
devtools: sync (#12899)
devtools: tsc type override bug workaround (#12933)
create faux psi report (#12815)

Misc

the great sample rebaseline (#12932)
restructure types to use project references (#12914, #12946, #12940)
build: sample flow report (#12930)
build: do not include locales in devtools bundle (#12921)
build: remove template.html from devtools report resources (#12891)
build: create UMD bundle build (#12898)
build: normalize sample-report build naming (#12901)
build: prefer paths when using gh-pages-app (#12905)
build: refactor devtools bundle tweaking (#12974)
tweak folder used for vercel deployment (#12879)
cli: improve error if invalid value for --output argument is passed (#12836)
exit collect-strings script with error code on failure (#12971)

8.3.0 (2021-08-10)

Full Changelog

We expect this release to ship in the DevTools of Chrome 94, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Haruaki OTAKE @aaharu
Georgi Yonchev @g-yonchev
Kartike Bansal @kraten

Core

fix resource size calculation of cached images (#12612)
convert core .d.ts files to modules (#12870, #12880, #12888)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

override quiet windows for observed performance (#12873)

Report

autogenerate components.js from templates.html (#12803)
reword SEO category description (#12877)
dom: handle undefined link url from proto roundtrip (#12872)

Deps

csp-evaluator: upgrade to exactly 1.0.4 (#12858)

Clients

viewer: convert to ES modules (#12878)

I18n

import (#12893)

Docs

readme: add SpeedVitals to the list of integrations (#12866)

Misc

remove nyc config (#12876)
npmignore all of dist/ except standalone report (#12855)

8.2.0 (2021-08-03)

Full Changelog

We expect this release to ship in the DevTools of Chrome 94, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Krzysztof Szarlej @kszarlej

Core

csp-xss: make n/a with empty results (#12801)
css-usage: ignore removed stylesheets (#12827)
emulation: bump chrome versions (#12849)
traces: disable cpu-profiler trace category (#12843)
byte-efficiency: mark n/a if no network records in timespan (#12839)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

add --fraggle-rock flag (#12805)
add config extension support (#12832)
add snapshot and timespan support to no-unload-listeners audit (#12830)
support config filtering via only/skip settings (#12808)
add timespan support to css-usage (#12728)

Report

convert to ES modules (#12702)
metric-filter: handle multiple reports in the same DOM (#12817)
dom: introduce safelySetHref (#12796)

Deps

update third-party-web to 0.12.4 (#12753)
update lighthouse-logger to 1.3.0 (#12812)

Clients

viewer: add disclaimer regarding devtools bug (#12846)
viewer: accept lhr from fragment (#12557)

Docs

readme: list dtekt.io in web perf services (#12831)

Tests

add fraggle rock smoke tests (#12834)
add report/ to tsconfig (#12822)
devtools: sync tests, fix cache action (#12807)
page-functions: remove segfault workaround (#12847)
smoke: convert to single LH run per test (#12818)
smoke: convert core tests to single-expectations format (#12819)

Misc

build: ensure distDir is present before emptying it (#12829)
types: fix null return on querySelector (#12848)
read locale files without using require (#12721)
add prefix to lighthouse-logger debug scope (#12806)

8.1.0 (2021-07-13)

Full Changelog

We expect this release to ship in the DevTools of Chrome 93, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Todor Totev @todortotev
Tanner Dolby @tannerdolby
Victor Porof @victorporof
Gareth Jones @G-Rath

Core

modern-images: update to include AVIF estimates (#12682)
preload: temporarily disable all preload advice (#12661)
network-request: consider HSTS redirects secure (#12681)
total-byte-weight: count partially finished requests (#12665)
canonical: proper explanation for url misuse (#12676)
fallback to selector, not tagName for nodeLabel (#12727)
csp-xss: update learn more link (#12672)
installable-manifest: align descriptions with applicatons panel (#12678)
trace: include additional perf categories (#12692)
tap-targets: add stylesheet over protocol (#12634)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

fr: uses-responsive-images-snapshot (#12714)
fr: limit scope of audits to applicable modes (#12764)
fr: split timespan support for server-response-time (#12758)
fr: enable traces artifact in timespan mode (#12695)
fr: add lighthouseMarker timeOrigin support (#12688)
fr: add timespan support to viewport-dimensions (#12680)
fr: add snapshot support to ImageElements gatherer (#12663)
fr: convert service-worker gatherer (#12662)
fr: add audit mode filter (#12649)
fr: split traceOfTab into timespan/navigation types (#12633)
fr: fix main-document-content (#12632)
fr: more precise AnyFRInterface types (#12622)
fr: convert script-elements gatherer (#12621)
fr: convert additional base artifacts (#12594)
fr: align base artifacts with legacy gather-runner (#12510)

Report

move renderer code to report/ (#12690)

Deps

bump axe-core to 4.2.3 (#12706)
update ws to latest (#12638)
jest: upgrade to 27.0.3 (#12454)
snyk: update snyk snapshot (#12599)
webtreemap: bump to fix focus traversal bug (#12625)

I18n

import (#12783)
allow strings with duplicate message and descriptions (#12723)

Tests

devtools: fix after renaming standalone-template.html (#12765)
don't double count server network requests on retry (#12779)
add explicit small-icu detection for i18n (#12696)
tweak variability assertion for load-things transferSize (#12701)
renderer: reduce console output about unknown types (#12644)
report: increase timeout for running axe on report renderer (#12610)
smoke: relative source map hash (#12607)
treemap: add test for node coverage shading (#12609)
fix flaky cache test (#12606)

Misc

treemap: elide origin from url if same as requestedUrl (#12598)
treemap: fix node coverage shading (#12603)
build: add build step for report (#12707)
npmignore larger unnecessary files (#12627)
run build-report for vercel deployment and lhci (#12782)
fix common "typos" (#12742)
get LH_ROOT via new file root.js (#12724)
scripts: improve collision check in collect-strings (#12697)
add GitHub bug report form (#12694)
scripts: error handling for pptr-run-devtools.js (#12679)
fix typos and update faq answer (#12605)
reference chromium main instead of master (#12757)

Scripts

i18n: support es modules in collect-strings (#12741)

8.0.0 (2021-06-02)

Full Changelog

We expect this release to ship in the DevTools of Chrome 93, and is already in PageSpeed Insights!

Notable changes

The Performance Category had a number of scoring changes to align with other performance tools and to better reflect the state of the web.
- The Performance Score has been reweighted (#12577)
- The TBT and FCP score curves have been updated (#12576, #12556)
- CLS has been updated to its new, windowed definition (#12554)
See the v8.0 Performance FAQ for more detail.
The report includes a new metric filter. Pick a metric to focus on the opportunities and diagnostics most relevant to improving just that metric:
The Lighthouse Treemap is now available across all the major Lighthouse clients. If your site exposes source maps to Lighthouse, look for the "View Treemap" button to see a breakdown of your shipped JavaScript, filterable by size and coverage on load.

🆕 New audits

The new audit csp-xss has been added to Best Practices to evaluate Content Security Policies and suggest ways of making them more secure. This can be a challenging audit to pass depending on hosting environment and page content, so for now it is unscored (#12514, #12551)

🤖💥 Breaking changes for programmatic users

Legacy metrics estimated-input-latency and first-cpu-idle have been deprecated, unweighted, and hidden since Lighthouse 6. They have now been removed (#12553)
Starting with Node 13, Node is built with full-icu by default, so the very large intl polyfill has been removed from Lighthouse's dependencies. See the readme FAQ if you're stuck with small-icu but need localization support (#12426)
Long-time audit uses-webp-images has a new ID, modern-image-formats. WebP is now rather mainstream, and this frees the audit to start including details on other cutting-edge image formats in the future (#12535)
The image-elements artifact has been restructured for clarity (#12568)

🧱 Core

navigate: only observe longtasks in PerfObserver (#12545)
script-treemap-data: do not create nodes with blank names (#12569)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

add settings to gather context (#12574)
fix usage of distributed conditional type (#12565)
support inspector-issues gatherer (#12530)
support tags-blocking-first-paint gatherer (#12527)
support response-compression gatherer (#12508)
align navigation-runner with legacy gather-runner (#12478)

📔 Report

improve accessibility of metric filter (#12552)
treemap: add placeholder, gist, and file upload features (#12511)
treemap: support passing gzipped data in url (#12509, #12519)
viewer: fix gist icon (#12505)

👥 Clients

fix main session OOPIF checks for devtools (#12533)
render treemap button in all clients (#12516, #12570, #12590)
backport proto formatting fixes (#12566)

🌍 i18n

import new strings (#12515, #12591)

📋 Tests

run unit tests on all active node versions in CI (#12513)
sync devtools webtests (#12578)
treemap: reduce debug.json (#12555)

🕸️ Deps

update lighthouse-plugin-publisher-ads to 1.4.1 (#12592)
update axe-core to 4.2.1 (#12575)
update puppeteer to 9.1.1 (#12284)
update chrome-launcher to 0.14.0 (#12507)

7.5.0 (2021-05-18)

Full Changelog

We expect this release to ship in the DevTools of Chrome 92, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Johannes Weber @johannes-weber

Notable Changes

We are releasing the Lighthouse Treemap!

You may already be familiar with treemaps thanks to webtreemap (which we use!) or source-map-explorer. With Lighthouse Treemap, you'll be able to view all the JavaScript bundles on your page easily from a Lighthouse report, in addition to some insights that may help reduce the amount of JavaScript on a page. The only requirement is that source maps are accessible (either publicly, or securely from the same computer that is running the Lighthouse audit).

We even collect code coverage data from Chrome, and extrapolate the coverage of individual modules in a bundle. Note: this only takes into account a cold-load: code only used after user interaction will be marked as unused. Stay tuned for a future release, which will enable you to configure user flows and capture even more accurate performance insights.

If we detect a large module included by multiple bundles, we'll alert you of that too.

You can access Lighthouse Treemap from the report:

Currently, only reports generated with the Lighthouse Node CLI will connect to the Lighthouse Treemap App. This functionality will be in DevTools and PageSpeed Insights as of Lighthouse v8.0.

Demo

Core

add new CLS (all frames) to hidden metrics audit (#12476)
script-treemap-data: default config (#12494)
script-treemap-data: include unmapped bytes (#12452)
driver: extract gotoURL to navigation module (#12421)
responsive-images: ignore images larger than viewport (#12414)
robots: use new fetcher to get robots.txt (#12423)

Fraggle Rock

Support for auditing user flows (#11313)

computed-artifact: remove settings and options from context (#12435)
convert optimized-images gatherer (#12491)
convert image-elements gatherer (#12474)
convert source-maps gatherer (#12467)
convert js-usage gatherer (#12450)
convert main-document-content gatherer (#12470)
convert css-usage gatherer (#12460)
convert trace-elements gatherer (#12442)
extract warnings from gather-runner (#12469)
extract driver preparation methods (#12445)
extract navigation errors from gather-runner (#12461)
split out DOM utilities from legacy driver (#12431)
separate phase from gatherMode (#12370)
add fetcher to transitional driver (#12419)
add computed cache to pass context (#12427)

Report

map metrics to audits, add metric filter (#11732, #12477)
add treemap button, refactor icon styles (#12392)

Deps

snyk: update snyk snapshot (#12443, #12468)
update transitive dependencies (#12466)
update marky to latest (#12440)

I18n

import new strings (#12492)

Docs

remove AMP Plugin example (#12390)
add python requests install to webtests (#12436)

Tests

update chromium installable source path (#12364)
i18n: only accept IcuMessages in toBeDisplayString (#12487)
add smokehouse to bin for downstream use (#12446)
split CI into unit and smoke workflows (#12422)
smoke: verify CSP violations caused by lighthouse (#12391)
add organic TTI savings case to byte efficieny audit (#12418)

Misc

treemap: esc to zoom out (#12498)
treemap: remove too similar color hues (#12497)
treemap: shade background for unused bytes (#12486)
treemap: update colors on enter keypress (#12496)
treemap: set focus-visible styles for view mode buttons (#12495)
treemap: tweak styles for mobile (#12493)
treemap: highlight treemap node on mouse hover table row (#12483)
treemap: upgrade to 3.2.0 for keyboard navigation (#12488)
treemap: use 0.1 for default granularity (#12485)
treemap: remove byte size from title (#12484)
treemap: add GA snippet for new property (#12481)
treemap: i18n (#12441)
treemap: fix colors (#12462)
treemap: duplicate-modules view mode (#12424)
treemap: add data table (#12363)
cli: destructure args in import (#12398)
move predictive-perf off renderer i18n (#12482)
do not publish lighthouse-cli/test except smokehouse (#12415)

7.4.0 (2021-04-27)

Full Changelog

We expect this release to ship in the DevTools of Chrome 92, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

kasperadk @kasperadk
Milutin Kristofic @milutin
Takeshi Kurosawa @takenspc

Notable Changes

Add element screenshots to PSI (#12288)

Core

csp-xss: hidden severity (#12240)
deprecations: ignore warning for ::-webkit-details-marker (#12341)
driver: move evaluateOnNewDocument to executionContext (#12381)
fetcher: fetch over protocol (#12199)
fetcher: disable auto-attaching for injected iframe (#12347)
hreflang: use Audit.makeNodeItem (#12273)
meta-elements: add NodeDetails (#12274)
unsized-images: pass with explicit aspect-ratio (#12377)

Fraggle Rock

Support for auditing user flows (#11313)

extract storage and service worker driver methods (#12400)
prepare emulation utilities for shared use (#12375)
filter out manual-only categories (#12367)
colocate PerformanceObserver installation with wait logic (#12365)

CLI

asset-saver: print one devtoolsLog event per line (#12348)

Report

tweak summary marker styles (#12267)
move budgets after diagnostics (#12334)

Deps

remove details-element-polyfill and rimraf (#12369)
snyk: update snyk snapshot (#12385, #12361, #12336, #12315, #12289)
update jsonld to latest (#12338)
replace inquirer with enquirer (#12317)
update eslint to latest (#12333)

I18n

import new strings (#12411)

Docs

architecture: augment gathering & artifacts descriptions (#12368)
readme: add Alertdesk to the list of integrations (#12356)

Tests

smoke request count assertion (#12325)
remove flaky Chrome launch from unit-cli (#12359)
retry some jest tests on failure (#12298)
cron to check for relevant chromium changes (#11763)
devtools: sync webtests (#12310)
smoke: remove html imports from dbw_tester (#12354)
smoke: update CLS-AF expectation (#12353)
fix split of smoke tests across jobs (#12323)
smoke: temporarily disable offline-warning check (#12312)
smoke: remove max chrome for lantern script attribution (#12270)

Misc

ci: increase yarn network timeout (#12376)
treemap: root node selector (#12360)
tweak unused-audits strings (remove -> reduce) (#12281)
puppeteer script to test a page from devtools (#12145)
treemap: tweak styles for logo spacing and text colors (#12342)
fix path check for roll-devtools script (#12358)
add patrickhulce back to issue assignment (#12357)
fix open-devtools script (#12313)
include SVG elements by default in typed querySelector (#12307)
fix PhaseArtifact type to include Stacks (#12280)
sentry: tag protocol method (#12268)

7.3.0 (2021-03-18)

Full Changelog

We expect this release to ship in the DevTools of Chrome 91, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Ryuichi Watanabe @ryuichi1208

New Audits

new_audit: csp-xss (experimental config) (#12044)

Core

csp-xss: csp evaluator npm module (#12221)
driver: remove unused goOffline/goOnline methods (#12135)
errors-in-console: properly define default options (#12200)
fr: convert base artifacts to gatherer artifacts (#12129)

CLI

correctly parse screenEmulation boolean flags (#12250)
only launch Chrome when running against localhost (#12140)

Report

use css var for element screenshots, move overlay to container (#12201)

Deps

update jsonld to latest (#12257)
update typescript and axe-core to latest (#12207)

I18n

import (#12255)

Docs

fixed typo in documentation throttling.md (#12154)

Tests

devtools: dynamically fetch chromium version (#12232)
devtools: fix webserver (#12236)
devtools: update chromium dependencies (#12130)
fr: update test artifact (#12202)
legacy-javascript: pin to specific versions of core-js (#12265)
smoke: ignore lantern script attribution in ToT (#12256)

Misc

treemap: unused-bytes view mode (#12142)
remove patrickhulce from issue assigner (#12220)
reorganize accessibility gatherer (#12076)

7.2.0 (2021-02-24)

Full Changelog

We expect this release to ship in the DevTools of Chrome 90, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

@1d0n7kn0w
Benajmin Franz @BennyAlex

Core

emulation: bump chrome versions (#12104)
unsized-images: ignore non-network SVGs (#12120)
preload: do not warn for cache loads (#12122)
be more lenient for some audits on localhost (#11766)

Fraggle Rock

Support for auditing user flows (#11313)

fr: add navigation phase + trace gatherer (#12098)
fr: add DevtoolsLog artifact (#12074)

Deps

update snyk snapshot (#12132)

Clients

lr: skip uses-http2 audit for mobile (#12115)

Docs

auth: correct path in readme (#12112)
throttling: retitle devtools panel h2 (#12126)

Tests

sync devtools tests (#12127)

Misc

treemap: first pass (#11832)
add LIGHTHOUSE_FLAGS to gcp script. tweak extract script (#12100)
rename lantern baseline values (#10950)
fixed typos More => more (#12092)
ci: update GH actions commit SHAs (#12099)

7.1.0 (2021-02-11)

Full Changelog

We expect this release to ship in the DevTools of Chrome 90, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

EEEEEEYHN @EYHN

Core

add hidden layout-shift variant metrics (#12046)
cls: refactor CLS and CLS-AF (#12069, #12034)
image-elements: set 5s time budget, add _privateCssSizing (#12065)
unsized-images: skip images that are zero-sized (#12054)
tap-targets: drop custom node rect creation (#12005)
alias element.currentSrc to element.src in node snippet (#12007)
fix js edge case in minification estimator (#12067)

Fraggle Rock

Support for auditing user flows (#11313)

fr: eliminate driver delegate from internal invocations (#12015)
fr: add more gatherers to config (#12016)
fr: add artifact dependency support (#12045)
fr: extract network monitor class (#12006)
fr: initial gatherer migration for snapshot, navigation (#11993)
fr: add session.onAnyProtocolMessage listener (#11995)

CLI

do not set AutofillShowTypePredictions (#12038)

Deps

axe-core: upgrade to 4.1.2 (#12075)
snyk: update snyk snapshot (#12071)

Tests

smoke: tweak expectations based on feedback from LR (#11962)
trace-elements: test node eviction with unit rather than smoke (#12056)

Misc

ci: increase fetch-depth for codecov SHA (#12079)
git3po: merge when green for unstable state too (#12078)
add issue assigner bot (#12052)
tighten querySelector types (#12013)

7.0.1 (2021-01-26)

Full Changelog

We expect this release to ship in the DevTools of Chrome 90, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Tyler Kindy @tkindy

Core

handle timer throttling in DevTools to avoid timeouts (#11987)
console-messages: use source-location (#11899)
errors-in-console: ignore BLOCKED_BY_CLIENT.Inspector errors (#11901)
font-size: handle valueless attributes for inline styles (#11934)
full-page-screenshot: get the MAX_TEXTURE_SIZE from the browser (#11847)
metrics: support FCP for all frames with devtools throttling (#11874)
normalize creation of NodeValue (#11877)
full-page-screenshot: do not render zero size rects (#11853)
replace most usages of evaluateAsync with structured evaluate (#11754)
trace: compute trace for main frame and any child frames (#11760)

Fraggle Rock

Support for auditing user flows (#11313)

add navigation runner (#11975)
config: refactor config cloning for fraggle rock (#11759)
add navigations to config (#11957)
add timespan runner (#11944)
filter configs by gather mode (#11941)
add base config (#11915)
add base gatherer class (#11917)

Report

remove title from audit clump expand (#11989)
use source maps to show original file name (#10930)
convert v6 emulatedFormFactor to v7 formFactor (#11876)

Deps

snyk: update snyk snapshot (#11979, #11952)

I18n

prevent strings with identical message and description (#11976)
import (#11947)

Docs

chromium-web-tests: add debugging tips (#11684)
readme: add plugin: lighthouse-plugin-crux (#11868)

Tests

legacy-javascript: sync results (#11980)
smoke: add category to run some perf tests in parallel (#11932)
revert mistaken change to yarn unit-core (#11955)
run code coverage in github actions (#11770)
remove travis (#11902)
increase treemap pptr timeouts (#11916)
add missing arrays to InspectorIssues sample artifact (#11871)
add more files in lighthouse-core/tests to tsconfig (#11728)
add warn-not-offline-capable smoketest (#11842)

Misc

add type checking to page functions (#11958)
proto: clarify deprecated state of EmulatedFormFactor enum (#11946)
fix "fast" npm script (#11997)
use typed-query-selector for native querySelector (#11990)
return specific html element type for dom.find (#11526)
build: extract 'yarn link…' rigamarole to own npm script (#11977)
proto: backport proto formatting fixes (#11978)
scripts: fix unbound variable in open-devtools (#11845)
update-report-fixtures: use a consistent server port (#11848)
add type checking to TagsBlockingFirstPaint (#11841)

7.0.0 (2020-12-16)

Full Changelog

Lighthouse 7.0 includes a number of programmatic breaking changes and new audits in the Accessibility and PWA categories. There were some improvements in the accuracy of metric calculations, but it is not expected that Performance scores will change significantly for almost all sites. There may be larger changes in Accessibility and PWA scores due to the new audits.

This release is expected to ship in the DevTools of Chrome 89, and to PageSpeed Insights within 2 weeks.

Notable changes

A full-page screenshot is taken and used to improve the experience of viewing DOM element details. Now a thumbnail will be shown and clicking reveals a lightbox showing where in the page the DOM node lived. This screenshot increases the size of the Lighthouse JSON by ~33%. (#11769, #11768, #11829, #11846, #11852)
The PWA Category changed fairly significantly.
- The Installable group is powered entirely by the capability checks that enable Chrome's installable criteria. These are the same signals seen in the Manifest pane in Chrome DevTools. As such, the "Registers a service worker…" audit moves to the PWA Optimized group, and the "Uses HTTPS" audit is now included as part of the key "installability requirements" audit.
- The Fast and reliable group has evaporated into thin air. 🌬 Now that revamped "installability requirements" audit includes offline-capability checking, we've removed the dedicated audits for checking if the current page and start_url respond with 200 when offline. Separately, the "Page load is fast enough on mobile network" audit was removed—while it's no longer part of the PWA section, we encourage folks building a PWA to consult the Performance category to ensure their web app is speedy and delightful.
A nightly Lighthouse build is now available as lighthouse@next on npm. Note that while automated tests pass before publishing, it's expected that this version will be more unstable than the regular releases (#11792, #11805, #11810)
The accessibility-testing library axe-core has been updated to the latest 4.1.1 release. The accessibility audits are now faster, more robust, and include multiple new checks (#11661)
Lighthouse runs a small benchmark at startup, and will now include a warning if the test machine appears underpowered and may be affecting the accuracy of the Lighthouse metrics (#11350)
Joomla and October CMS detection has been added, so pages on those platforms will now get customized advice on some Lighthouse audits (#11788)

New contributors

Thanks to Kohta Ito (@koh110) and Sam Stoelinga (@samos123) for their first contributions!

🆕 New audits

The new installable-manifest PWA audit, mentioned above, uses Chrome's own installability criteria so it will always stay in sync with installability requirements (#11745)
third-party-facades looks for third-party embeds in the test page that can be lazy loaded with a static "facade". If the embed isn't necessary for immediate interaction by a user, consider using one of the facades to speed up page load (#11290)
With the axe version upgrade comes new audits ensuring accessible naming: aria-treeitem-name, aria-command-name, aria-tooltip-name, aria-meter-name, and aria-progressbar-name (#11661)

♻️ Removed audits

The update to latest axe-core also removes two audits that weren't checking much: layout-table and video-description (#11661)
works-offline and offline-start-url audits were removed as their checks are now covered by the new installable-manifest implementation (#11806)
The load-fast-enough-for-pwa audit has also been removed since Lighthouse's existing performance metrics more than cover the needs there (#11764)
without-javascript has been removed (#11711)

💥 Breaking changes

Device-emulation config settings and CLI flags have changed to be clearer and have less overlap. If you've used --emulated-form-factor or other emulation-related configuration, you'll need to make changes. The new settings should be considerably simpler to use with custom Lighthouse runners using real devices, Puppeteer, or system-level throttling. See the emulation docs for migration guidance. (#11779)
When waiting for the page to be fully loaded, Lighthouse will now wait if there are active high-priority network requests. In rare cases, like where the app initialization is dependent on a single, slow-returning XHR, some performance metrics may worsen; however, the new measurements are now accurate. (#11738, #11851)
Support for Node 10 has been dropped. The minimum required Node version is now 12 (#11656)

🤖💥 Breaking changes for programmatic users

These changes are unlikely to affect end users, but may be important if you are writing custom configs, plugins, or processing the Lighthouse JSON output.

ConsoleMessages is a new artifact that is a combination of the old ConsoleMessages and RuntimeExceptions artifacts, with some expanded data on items logged to the console. RuntimeExceptions has been removed (#11663)
DOM "node details" data formerly spread throughout existing artifacts are now gathered in a NodeDetails property on each element (#11474, #11695, #11752)
The ImageElements artifact has been streamlined to better represent the data collected and how it's used (#11703, #11707, #11733)
Previously, extends: true was allowed as an alias for extends: 'lighthouse:default' to extend a config from the default Lighthouse config file. The boolean option has been removed to prepare the way for extending from any valid config file (#11835)
A never-used feature to pass options from the config to gatherers has been removed to be compatible with future changes (#11743)

🧱 Core

Improvements, bug fixes, clarifications

lantern: allow non-XHRs to depend on CPU Nodes (#11767)
lantern: maximize throughput under HTTP/2 (#11666)
properly split node labels in the report around unicode surrogate pairs (#11698)
move the service-worker audit to the pwa-optimized group; its path in the JSON and metadata on scope URLs are unchanged (#11798)
support local plugins from a globally-installed Lighthouse (#11696)

Internal refactors and improvements

driver: create typed Runtime.evaluate from function code (#10816)
gather-runner: remove <M82 compat for InstallabilityErrors (#11782)
simulator: clearer intermediate timing types (#11744)
types: remove unneeded casts (#11753)
lightrider: skip uses-http2 audit (again) (#11777)
script-treemap-data: fix sourceRoot and missing coverage bugs (#11825)
fraggle-rock: add base snapshot runner (#11748)
fraggle-rock: add driver (#11742)

Tests

re-enable change-related tests in github actions (#11801)
smoke: use font-size for a non-composited animation in tests (#11808, #11836)
smoke: handle warn-not-offline-capable in test (#11799)
smoke: fix failureReasonsMask flake (#11791)
smoke: update flaky third-party-facades test (#11786)
make devtools webtests stable and reliable (#11717, #11731, #11751, #11789, #11790, #11804, #11809, 6ad47fa)

Misc

uses-http2: remove mention of h2 push in docs (#11834)
readme: add integration (#11775)
add log files to GCP run results (#11833)
temporarily allow css in redirectPass to work around crbug (#11813)
eslintignore *.d.ts files (#11793)
buildtracker: skip git --deepen if no token (#11785)
build: quiet the npm pack command (#11783)
build: fix bundling lighthouse-plugin-publisher-ads in Lightrider (#11648)
release: add print-contributors.js script (#11736)

Deps

update yargs to latest (#11794)
update old transitive deps (#11811)

6.5.0 (2020-11-30)

Full Changelog

We expect this release to ship in the DevTools of Chrome 89, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Ashley Claymore @acutmore
Brad Frost @bradfrosty
Daniel Arthur Gallagher @DanArthurGallagher
Stephen @stephenyu
Vladimir Makhaev @vmakhaev

New Audits

preload an image if it is the LCP element (#11486)
issues logged in the Devtools Issues panel (#11409, #11710)

Core

metrics: support CLS for all frames (#11713)
metrics: support LCP in all frames for devtools throttling (#11701)
stacks: update to support october cms and joomla (#11729)
artifacts: encapsulate node details in an object (#11474)
critical-requests: refactor to use lantern graph (#11533)
hidpr-images: never recommend more than 2x (#11518)
driver: resume on debugger statements (#11727)
is-crawlable: always ignore mailto anchors (#11554)
error: add dedicated error string for NO_FCP (#11579)
dom-size: remove formatNumber (#11563)
gather-runner: use final document when reporting non-HTML error (#11620)
preload-lcp-image: properly calculate the potential savings (#11612)
tracehouse: improve CPU profiler timing refinement (#11608)
add devtools path to DOMStats (#11578)
tracehouse: split timeOrigin determination out of computeTraceOfTab (#11253)
tracehouse: use tasks to improve profiler timing data (#11446)
unsized-images: respect CSS rules from stylesheets (#11590)
runner: abstract gather phase out of runner (#11623)
driver: extract waitFor methods (#11685)
driver: extract evaluateAsync logic for FR driver (#11633)
lantern: traverse generator method (#11636)
js-bundles: return error object when sizes cannot be determined (#10449)
add timing instrumentation for base artifacts (#11672)

Experimental

full-page-screenshot: resolve node rects during emulation (#11536)
full-page-screenshot: drop max datauri size constraints (#11689)
full-page-screenshot: use dpr 1 (#11688)
full-page-screenshot: use layoutViewport width (#11402)
do not show element screenshot if out of bounds (#11538)
add script-treemap-data to experimental (#11271)
treemap: initialize app structure (#11635)
treemap opener, ?dev for localhost viewer and treemap (#11667)

Deps

remove cz-customizable as local dep (#11719)
update to typescript 4.1.2 (#11690)
bump various dependencies to quiet security alerts (#11693)
update brfs to fix build in node 15 (#11676)
upgrade lighthouse-plugin-publisher-ads to 1.3.0 (#11660)
add @types/yargs-parser (#11517)

Clients

viewer: extract the LHR from PSI json (#11650)

I18n

format bytes with consistent fractional width (#11489)
import (#11715)

Docs

readme: add Apdex to integrations (#11655)
update throttling reference (#11645)
configuration: update description of extends property (#11488)
releasing: update release process (#11502)

Tests

rebaseline devtools test, print each .lh-audit id (#11702)
smoke: attempt to fix cls-elements flake (#11426)
update github actions to use env files (#11674)
remove unnecessary jest babel transform (#11664)
use setup-protoc bugfix branch (#11665)
update static content shell version (#11634)
limit LCP element audit to m87 and earlier (#11625)
update MixedContent test to match ToT (#11584)
add devtools test for important data warning (#11544)
reset smoke transferSize expectations to reality (#11534)
add tests for networkRecordsToDevtoolsLog (#11523)
mock saveLhr and assert no unit test source changes (#11519)

Misc

build: give build-tracker a shared git history on PRs (#11449)
build: refactor viewer bundler into reusable GhPagesApp (#11564)
add script to automatically test lighthouse on a page from devtools (#11539)
add save latest run script (#11516)
remove compile-against-devtools.sh (#11520)

6.4.1 (2020-10-02)

Full Changelog

This is a minor release to fix an issue in the npm package where v6.4.0 was published with a lot of unncessary files.

New Contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Csaba Palfi @csabapalfi

Core

prevent attribute truncation side-effects (#11503)
save lhr on -A (#11509)

Tests

run every smoke test (except forms) for bundle (#11493)

Misc

add chromium webtests to npmignore (#11512)

6.4.0 (2020-09-30)

Full Changelog

We expect this release to ship in the DevTools of Chrome 88, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Denis Seleznev @hcodes
Irfan Maulana @mazipan
James Garbutt @43081j
Matt Hobbs @Nooshu
Mohammed J. Razem @moerazem
Pujitha.E @pujitha7
Quentin @qwright10
andreizet @andreizet

Notable Changes

large-javascript-libraries: move to experimental (#11484)
driver: don't clear indexedb, websql, or localstorage before run (#11438)

New Audits

unsized-images reland (#11340): This audit confirms users' images are explicitly sized; ultimately preventing layout shift and improving CLS.

Core

tracehouse: add CPU trace profiler model (#11072)
stack-packs: add Drupal pack (#10522)
stack-packs: move to lighthouse-stack-packs npm package (#11370)
axe: use our html snippet rather than axe's (#11362)
benchmarkindex: add workaround for Intel microcode fixes (#11483)
config: correct typo on throttling profile name (#11355)
image-elements: do not set untrusted natural dimensions (#11457)
installable-manifest: expose app manifest url (#11330)
is-on-https: add missing space in description (#11466)
is-on-https: remove <M84 codepaths (#11373)
js-usage: normalize url key (#11302)
password-inputs-can-be-pasted-into: add devtoolsNodePath (#11416)
normalize node information in gathering (#11405)
traverse shadow hosts in getNodePath (#10956)
minification-estimator: minify nested template literals in JavaScript (#11395)
expose service worker url on service worker audit (#11329)
preconnect: ignore unimportant origins (#11306)
autocomplete: add chrome suggestions, invalid warning (#11342)

Report

let fireworks eligibility ignore PWA category (#11200)
csv: add overall category scores (#11404)
normalize -0 to 0 (#11353)
set min-width on code table column (#11359)

Deps

lighthouse-stack-packs: update (#11492)
update third-party-web (#11469)
chrome-launcher to v0.13.4 (#11434)
update transitive lodash (#11448)
inquirer: upgrade to 7.3.3 (#11441)
snyk: update snyk snapshot (#11347)

Clients

devtools: update report-generator.js to match DevTools changes (#11411)
lr: enable uses-http2, add protocol override header (#11439)

I18n

import (#11494)
remove incorrect aliases (#11487)
use placeholders more for html terms (#11406)
use IcuMessage objects instead of string IDs (#10630)
code-escape in preconnect and preload (#11401)
accept array of locales in lookupLocale (#11349)
add more translator strings to font-size (#11338)

Docs

auth: add setCookie example (#11473)
variability: expand on lighthouse-ci usage (#11377)
remove PageSpeed Green from integrations (#11390)
add microlink to integrations (#11048)
releasing: align 2 days before branch. update managers (#11333)
add CPU throttling guide (#11325)

Tests

page-functions: add test for getNodePath (#11433)
check for dependencies when setting up blink tools (#11437)
hash more files for devtools test cache (#11417)
smoke: fix preconnect flake w/ a non-locally installed font (#11425)
add markdown link checker (#11358)
webtests: test pub ads plugin (#11364)
rebaseline webtests (#11351)
devtools: fail on unset/unbound env variable (#11331)

Misc

build: fix mangling for tap-targets gatherer (#11463)
script for analyzing results from gcp data collection (#11296)
make FormElements not a public artifact (#11476)
yarn open-devtools (#11445)
build: use terser on inline assets (#11461)
tweak typescript jsdoc for list format (#11447)
build: minify bundles with terser (#9605)
add score shapes to legend (#11440)
axe: rename axe types (#11432)
update stack packs, remove duplicated stack pack files (#11396)
build: fix devtools tests by making empty type files (#11418)
hide locale files by default in PRs (#11363)
fix typos in jsdoc types (#11367)
build: include publisher ads plugin in lightrider bundle (#11366)
flatten new service-worker audit details (#11361)
fix run-web-tests.sh (#11346)

6.3.0 (2020-08-26)

Full Changelog

We expect this release to ship in the DevTools of Chrome 87, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Adriana Ixba @adrianaixba
Daniel Hollas @danielhollas
Danilo Velasquez Urrutia @dvelasquez
Jivthesh M R @jivthesh
Pete Nykänen @petetnt
Radu Micu @radum
ryo @ryoAccount
Saavan Nanavati @saavannanavati
Stanislav Popov @popstas
Wicked @Wicked7000

Notable Changes

revert: move unsized-images to experimental due to perf impact (#11317)

New Audits

add preload-fonts audit (#11255)
add large-javascript-libraries audit (#11096)
add valid-source-maps audit (#11236)
add autocomplete to experimental config (#11186)

Core

global-listeners: dedupe duplicate events in GlobalListener gatherer (#11303)
module-duplication: ignore smaller modules (#11277)
non-composited-animations: add unsupported css properties (#11246)
non-composited-animations: add more actionable failure reasons (#11268)
non-composited-animations: update the "learn more" link (#11258)
renderer: improve the unknown timezone checks in util.js (#9822)
response-time: add time spent to details (#11307)
trace-elements: do not break on unresolvable node id (#11298)
font-size: remove deprecated DOM.getFlattenedDocument (#11248)

Report

third-party-summary: show resources for entity (#11219)
handle invalid urls for source location items (#11299)
show axe version in runtime settings (#10729)
use dash gauge for categories with entirely n/a audits (#11024)

Deps

update lighthouse-plugin-publisher-ads to 1.2.0 (#11301)

I18n

import (#11324)
translate remaining strings in font-size (#11327)
make double dollar validation less strict (#10299)

Docs

add Code of Conduct to project (#11212)
add audit naming guide (#11308)
throttling: replace comcast with throttle and add more windows options (#11143)
readme: add related projects: site-audit-seo (#11305, #11250)
readme: align headings with table of contents (#11288)

Tests

run chromium webtests for devtools integration (#11176, #11328)

Misc

benchmark: update BenchmarkIndex for m86 changes (#11304)
add benchmark script with octane and speedometer (#11247)
add gcp fleet creation scripts (#11257, #11233)
rephrase comments to be more inclusive (#11228)
fix types in duplicated-javascript (#11278)
fix typo in method name (#11239)
move doc link (#11300)

6.2.0 (2020-08-06)

Full Changelog

We expect this release to ship in the DevTools of Chrome 86, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Adam Raine @adamraine
Saavan Nanavati @saavannanavati
lemcardenas @lemcardenas
George Makunde Martin @gMakunde
David Gilman @dgilman
Emilio Garza @emiliogarza
LukasAuerMstage @LukasAuerMstage
Mustafa Aydemir @mstfydmr
Pramod Mali @malipramod
Robin Tom @robintom
Stacey Tay @staceytay
Wojciech Maj @wojtekmaj
moli @phpmoli
Муравьёв Семён @Zulcom

New Audits

move duplicated-javascript and legacy-javascript audits to default config (#10881, #11103)
report animations not run on compositor (#11138, #11168, #11105)
add unsized-images audit (#11188, #11115, #11217)
add no-unload-listeners audit (#11085)

Core

uses-http2: convert into opportunity (#10626)
lantern: fallback to FCP in 0-weight SI situations (#11174)
stacks: timeout stack detection (#11172)
add FormElements gatherer (#11062)
cls: add back early shift events if they were ignored (#11079)
critical-request-chains: prune requests without an initiator (#11151)
error if chrome version does not support lcp metric (#11016)
font-display: dedupe warnings by font origin (#11068)
gather-runner: error on non-HTML (#11042)
hreflang: assert that the href is fully qualified (#11022)
image-elements: gather correct natural size for srcset (#11101)
is-on-https: add mixed-content resolution (#10975)
lantern: ignore circular initiators (#11148)
link-elements: add devtoolsNodePath (#11061)
link-text: removing inicio from blocklist resolves #11026 (#11073)
page-functions: expose simulated throttling requestIdleCallback shim (#11032)
redirects: surface client-side redirects (#11027)
tracehouse: expose navigationStart only as timeOrigin (#11034)
add cap to amp stylesheet links for simulated throttling (#11069)
remove uses of deprecated extendedInfo field (#10779)
config: remove typo in a11y tables lists group (#11099)

CLI

clearTimeout for faster exit (#11170)
warn if Chrome died on its own instead of exit (#11139)

Report

correctly display CLS in budget table (#11209)
add full-page-screenshot to experimental config (#10716)
vertically center thumbnails (#11220)
truncate long attribute values in HTML snippets (#10984)
unused-javascript: update "learn more" link (#10985)

Deps

snyk: update script to prune <0.0.0 and update snapshot (#11223)
snyk: update snyk snapshot (#11046)
update dot-prop secondary dependency (#11198)
update jpeg-js to 0.4.x (#11167)
update third-party-web (#11137)

I18n

import strings (#11082, #11225)
disallow invalid text outside complex ICU arguments (#11135)
update AMP Optimizer URLs (#11088)
log the percentage of translated messages (#11149)

Docs

configuration: updates and tweaks (#11141)
update architecture.md (#11040, #11089)
readme: add Screpy to list of integrations (#11126)
readme: fix logging in programmatic use code example (#11116)
update devtools screenshot (#11092)
fix typo in viewer readme for loading json from url (#11080)
readme: update Foo integration (#11050)

Tests

istanbul ignore inpage function (#11229)
update chromestatus expecatations (#11221)
minification-est: add testcase with pre-minified bundle (#11191)
update to typescript 3.9.7 (#11158)
smoke: skip expectation with _chromeMajorVersion (#10976)
smoke: use caltrainschedule instead of polymer shop (#11052)
relax requestIdleCallback smoke expectation (#11041)
parallelize all the tests (#11009)
upgrade codecov to 3.7.0 (#11039)
update minor version of angular fixture redux (#11192)
run GitHub Actions on master and PRs (#11035)
run test-viewer in github actions (#11195)
add windows to GitHub actions CI (#11087)
use latest windows image on appveyor (#11083)
remove appveyor (#11171)

Misc

remove last extendedInfo in LH.Audit.Product (#11067)
add GCP collection scripts (#11189)
tighten RecursivePartial type (#11175)
release: tweaks (#11021)
compare-runs: fix error when no lh-flags arg passed (#11015)
annotate version-specific logic with COMPAT comments (#11019)
add tools to track issue response time (#11020)
tweak naming in element-screenshot renderer (#11152)
ignore coverage of page-functions (#11136)

6.1.1 (2020-07-07)

Full Changelog

This is a patch release to fix an issue that only occurred in 6.1.0 for Node environments. It will only be released to npm.

Core

fetcher: ensure fetch doesn't cause unhandled promise (#11036)

6.1.0 (2020-06-25)

Full Changelog

We expect this release to ship to DevTools in Chrome 85, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Loftie Ellis @lpellis
Marvin Frachet @mfrachet
Matt Hobbs @Nooshu
Peter Marshall @psmarshall

Notable Changes

If a page has publicly-accessible JavaScript source maps, Lighthouse will collect them to enhance the unused-javascript audit. In future versions of Lighthouse, source maps will be used for entirely new audits (#10990).
The report now uses KiB instead of KB. This is simply a label change; the value was and still is equal to 1024 bytes (#10870).

New Audits

long-tasks: a new performance diagnostic that shows the longest main-thread-blocking tasks during load (#10736)
crawlable-anchors: a new SEO audit that checks that anchors link to resolvable URLs (#10662)

Core

unused-javascript: increase threshold to 20KiB (#10906)
layout-shift-elements: surface CLS contribution per shifted element (#10968)
emulation: bump chrome versions (#10787)
image-size-responsive: quantize DPRs (#10801)
long-tasks: add startTime property (#10942)
improve resilience of nodeId-dependent gatherers (#10877)
median-run: add computeMedianRun to lib (#10859)
preload: ignore cross-frame requests (#10847)
new inspector issues gatherer for Audit.IssueAdded events (#10664)
subRow refactor, rename to subItem (#10867, #10978)

Experimental

Features hidden behind the --preset=experimental flag.

legacy-javascript: reduce polyfills, fix core-js import in test (#10937)
legacy-javascript: use prescriptive language in title (#10850)
legacy-javascript: fix core-js 3 detection (#10852)
legacy-javascript: use third-party-web for scoring (#10849)
duplicated-javascript: display transfer size (#10701)

Deps

axe-core: upgrade to 3.5.5 (#10986)
upgrade chrome-launcher@0.13.3 (#10911)
snyk: update snyk snapshot (#10840, #10940, #10980, #11010)
remove bundlesize (#10999)
update to lhci 0.4.0 (#10828)

Report

metrics: use css grid so metrics are aligned (#10789)
don't dim disclaimer anchor links (#10981)
use acronyms and round metrics for shorter calc url (#10954)
update link for budgets audit (#10944)
add trailing slash to web.dev links (#10967)
fix the width of the 3-dots menu in topbar (#10855)
updated method signature typing to remove focusevent cast (#10858)
adjust LCP element description (#11018)
renderer: fix null Util.i18n in PSI renderer (#10822)
psi: show disclaimer and calclink (#10936)

Docs

add note about git repo required for @lhci/cli usage (#11006)
contributing: add tips for audit and gatherer PRs (#10690)
readme: update programmatic usage recipe (#10878)
readme: add new and updated integrations (#10838, #10901, #10826, #10818)

Tests

move proto roundtrip json to .tmp/ (#10995)
add heading key tests (#10746)
run ToT and stable Chrome for smoke tests in github workflow (#10989)
legacy-javascript: exit code 1 on failure (#10946)
smoke: use --debug in github action (#10919)
smokehouse: do not assert on flaky node path (#10827)

Misc

rename subHeading to subItemsHeading (#10979, #10983)
viewer: expose LHR as __LIGHTHOUSE_JSON__ (#10879)
use more inclusive and descriptive language (#10949)
update changelog for v6.0.0 (#10821, #10807)

6.0.0 (2020-05-19)

Raw commit changelog

We expect this release to ship in the DevTools of Chrome 84.

Notable changes

So many! See the Lighthouse 6.0: What's New blog post for an in-depth look.

🆕 New audits

Largest Contentful Paint (LCP) is a new metric that measures the time from navigation until the largest content element in the viewport is rendered (#9905, #10213, #10452, #10529).
- largest-contentful-paint-element is a companion audit that gives information about which element triggered the LCP (#10517, #10713).
Cumulative Layout Shift (CLS) is a new metric that measures the amount of unexpected movement of content as a page loads (#9037, #10427, #10495, #10570, #10728).
- layout-shift-elements is another companion diagnostic that gives information about the elements that shifted as the page loaded (#10702).
unused-javascript is an audit that has been kicking around for some time but is only now turned on by default. It accounts for what JavaScript was loaded but never executed during page load and estimates the load time that could be saved via code splitting, dead code elimination, or judicious use of the delete key (#9854).
A PWA maskable-icon just looks better on your homescreen, so this new audit encourages you to have at least one available in your manifest (#10370).
timing-budget expands budget assertions to now be settable on all the performance metrics (#9901, #9925).
The new charset audit ensures a proper character encoding for page content (#10284, #10389, #10689).
image-size-responsive checks that images have an aspect ratio and resolution that match well with how they are displayed on a page (#10460).
Updating to the latest version of axe-core has unlocked a number of new accessibility audits: aria-hidden-body, aria-hidden-focus, aria-input-field-name, aria-toggle-field-name, duplicate-id-active, duplicate-id-aria, form-field-multiple-labels, heading-order (#9798).

⚗️ Experimental audits

These audits are not yet part of the default Lighthouse experience, but they will provide performance advice based on analysis of a page's JavaScript bundles. They can be tested today on the command line with the --preset=experimental flag.

legacy-javascript rummages through your bundles looking for polyfills and bundler transforms that aren't necessary or are outdated (#10303, #10568, #10564).
duplicated-javascript also takes a dive through a page's JavaScript looking for code that has ended up duplicated within bundles or across multiple bundles (#10314).
unused-javascript now runs by default (as mentioned above), but when run under experimental, the audit can use source maps to show what original source code was never run and could be postponed or eliminated (#10090).

New contributors!

Thanks to @TGiles, @roelfjan, @chruxin, @warrengm, @alexgreencode, @mikedijkstra, @egsweeny, @johnsampson, @jazyan, @b3none, @mattjared, @Malvoz, @Beytoven, @Munter, @jayaddison, @msomji, @piotrzarycki, @awdltd, @mathiasbynens, @Carr1005, @staabm, @SphinxKnight, @sk-, @AndreasKubasa, @jantimon, @kmanuel, @Kikobeats, @RolandBurrows, @nxqamar, @catalinred, and @baseeee for their first contributions! So many!

💥 Breaking changes

Performance metric scores have been reweighted to better reflect a user's loading experience (#9949).
Metric score curves have been updated when running a desktop Lighthouse test to account for the faster connection and CPU (#9911, #10756).
frameNavigated events are now used to track redirects, which means JS redirects are now accounted for when determining the run's finalUrl (#10339).
The emulated mobile device has moved from the Nexus 5x to the Moto G4 (but the existing DPR has been left unchanged) (#10191, #10749).
The mixed-content preset has been removed as it was not widely used and takes too long to be added to the default Lighthouse experience (#10159, #10750).
The full preset has been renamed experimental to signify that the code there may not be ready for running by default (#9930, #10311, #10333, #10585).
The emulated Chrome UA string has been updated to Chrome 80 (#9967).
installable-manifest: icons in the Web app manifest must be fetchable to be considered installable (#10168, #10320)

🤖💥 Breaking Changes for programmatic users

These changes are unlikely to affect end users, but may be important if you are writing custom configs, plugins, or processing the Lighthouse JSON output.

LH.Audit.Context passed into audits is now treated as immutable. If code previously pushed to context.LighthouseRunWarnings to get a top-level warning, it should now pass that back in runWarnings on the audit's product (#10555).
Audit.computeLogNormalScore has been redefined to specify log-normal curves with median and p10 points (dropping the "point of diminishing returns"). Existing audits have been moved to this new definition so that no score changes should occur (#10715).
A loadFailureMode setting has been added to Config passes to control behavior in case of page load failure. Previously this was implicitly controlled (e.g. no offline page available did not cause an error) (#9987)
time-to-first-byte has been renamed server-response-time to better reflect what is being measured by the audit (#10735).
resource-summary: details.items.size has been renamed to transferSize for clarity (#10700, #10743).

🧱 Core

Improvements, bug fixes, clarifications

The following changes are considered to be bug fixes or updates to better match what was intended to be audited, but the changes may cause adjustments in audit scores or behavior.

add top-level warning if Lighthouse hit a timeout before load was complete (#10538)
add top-level warning if tested URL was redirected (#10157)
FCP + 5 seconds is now included as a minimum time that must be reached before the test page is considered loaded (#10505, #10516)
load simulation: add edges from initiatorRequest when there are duplicate records (#10097)
load simulation: keep first layout/paint/parse events regardless of duration (#9922)
load simulation: do not create self-dependencies via timers (#10280)
load simulation: remove min task duration on CPU nodes (#9910)
load simulation: use fixed times for data URLs since they've already been loaded (#9932)
load simulation: link layout nodes to root frame request (#9727)
tracehouse: improved attribution for XHRs + paint/layout/HTML (#10001)
offscreen-images: look outside three viewports for possible images to defer (#10643)
uses-responsive-images: include offscreen images larger than viewport (#10506, #10561)
accessibility: include axe-core 'incomplete' results in artifact to include even partial a11y results (#10072, #10270)
audio-caption: remove check that has been disabled by axe-core (#10453)
link-text: Add more keywords to blocklist (#9986)
font-size: don't allow a deleted node to fail gatherer (#9928)
installable-manifest: lower required icon size from 192px to 144px (#10175)
is-on-https: add filesystem to secure schemes (#10073)
offscreen-images: exclude lazy or eager loading images (#10117)
resource-summary: don't include favicon.ico in summary (#10190)
uses-rel-preconnect: warn if more than three preconnects found (#9903, #10293)
third-party-summary: don't include main resource if origin in third-party list (#10006)
js-lib-detector: handle new fast lib detection entries, version heterogeneity (#9888, #10295, #10176)
is-on-https: update description to reference mixed content (#10712)
definition-list: mention <div> is allowed to group content in <dl> (#10479)
offline-start-url: improve failure messages (#9982)
update and fix links to docs in audit and stack-pack descriptions (#9850, #9863, #10019, #10069, #10246, #10496, #10714)

New things for programmatic users

audit results now have a numericUnit property to specify the units for their numericResult (#9979)
ImageElements: add usesPixelArtScaling and usesSrcSetDensityDescriptor properties (#10481)
MetaElements: include property attribute (#9978)
add new base artifact HostFormFactor (#9923)
refactor to share unused-javascript-summary as a computed artifact (#10387, #10634)
add new source-map computed artifact, js-bundles (#10078)
refactor to share unused-css as a computed artifact (#10160)
refactor to share metric timing as a computed artifact (#9814)
budgets: add support for CLS and LCP budgets (#10579, #10625)
budgets: add firstPartyHostnames to the API (#10105, #10324)
budgets: remove unused tolerance property from API (#9770)

Internal refactors and improvements

ensure axe-core errors are properly serialized (#10646)
cleanup of audit-details type names (#10603)
include finished state on hidden network-requests audit (#10530)
fetch source maps outside of test page so not blocked by CORS (#9459)
driver: dead code cleanup (#10491, #10571)
add internal-only __internalOptionalArtifacts for experimental artifacts (#10355)
font-size: use DOMSnapshot.captureSnapshot for better performance (#10200)
use isolated evaluateAsync when fetching content from the test page (#10130)
budgets: centralize path-matching logic (#9895)
script-elements: fetch script content in parallel (#9713)
include GatherRunner.runPass in internal perf timing numbers (#10205)
rename GatherRunner.isPerfPass for clarity (#9896)
migrate to flattened Chrome DevTools Protocol (#9783)

💻 CLI

add support for multiple --chrome-flags (#10607)
allow comma-separated values for --output (#10188)
add --chrome-ignore-default-flags (#10184)
allow --extra-headers as object (#9962)

📔 Report

add "Trust and Safety" group in the Best Practices category (#10623)
add link to score calculator populated with current metric scores (#10754, #10763, #10773, #10767)
improve display of top-level warnings (#10636, #10765)
external-anchors-use-rel-noopener: use node audit details type (#10242)
is-crawlable: include robots.txt line number that blocks crawling (#10154)
temporary test of css grid for metrics (#10695, #10778)
define monospace font-size relative to report-font-size (#10761)
link to updated scoring documentation (#10725)
add non-null jsdoc type annotations for internal linter (#10454)
clarify "size" as either transfer or resource size (#10420)
update table and inline code formatting (#10437)
fix link contrast in dark mode (#10364)
add channel to runtime settings (#10099)
align audit warnings (#10232)
close drop-down menu when focus is lost (#10208)
hide drop-down menu when printing (#10216)
move Util.UIStrings to Util.i18n (#10153)
add initial support for subrows within a table (#10084)
adjust score gauge's arc length to account for rounded linecap (#9913)
fix header-shifting flicker during scrolling (#9955)
add source-location details for linking to source code (#9354)
CSV report: add tested URLs to entries (#10656, #10675)
viewer: add option for loading JSON from any URL (#10608)
viewer: mention other lighthouse channels (#10384)
viewer: add page and cursor styling to signal loading (#10305, #10348)
viewer: use new logo (#9991, #9999, #10002)

👥 Clients

retire extension; replace with PSI launcher (#9193, #9988, #9989)
extension: add firefox support (#10332)
extension: remove content security policy (#10380)
devtools: share desktop throttling settings with lightrider (#10322)
devtools: split up runLighthouseInWorker and expose to worker (#10005)
devtools: add settings.internalDisableDeviceScreenEmulation (#9377)
devtools: include lighthouse-plugin-publisher-ads in bundle (#9924, #10583, #10682)
devtools: update roll-to-devtools and track upstream changes (#9942, #10310, #10036, #10758, #10762)

🌍 i18n

new strings: audits, stack packs, headings, and corrections (#9940, #10244, #10245, #10645)
localize runtime settings and tools in report (#9166)
don't give unused arguments for localized protocol errors (#9935)
use log.verbose() for outdated-strings warning (#9931)
centralize strings for metric names (#9871)

Docs

plugins: update recipe and docs to use NODE_PATH (#9997, #10028)
plugins: update example list (#9917)
scoring: update for v6, defer to web.dev for performance (#10223, #10633, #10676)
lantern: add deep-dive video (#10546)
new-audits: emphasize what makes a good audit (#10376)
hacking-tips: link to gist on using audit results directly (#10480)
variability: expand on hardware recommendations (#10483)
throttling: add devtools-throttling deprecation notice (#9933)
auth: use --disable-storage-reset in recipe (#10189)
tweak authenticated-pages and puppeteer docs (#10277)
add integration-test recipe for using Lighthouse and Jest (#9722)
add performance-budgets doc (#10542)
add recipe for using puppeteer in a custom gatherer (#10253, #10447)
add readme for build/ directory (#10004)
readme: add variability and throttling to FAQ (#10631)
readme: add a table of contents (#10283)
readme: add note about yarn test-docs (#10263)
readme: fix typos (#10179, #10694)
readme: add protobuf install directions (#10250)
readme: separate free and paid integrations (#10027)
readme: add new and updated integrations (#9954, #9984, #10018, #9985, #10156, #9836, #10385, #10466, #10475, #10609, #10745)

Tests

remove protobuf roundtrip check (and local protobuf dev requirement) from yarn update:sample-json (#10557, #10661)
run CI tests on new github action (#10418, #10551, #10620, #10622, #10627)
report to buildtracker on commit via CI github action (#10550, #10718)
lantern: update golden trace collection script and recollect them (#9662, #10129, #10209, #10279, #10663)
smokehouse: refactor to be able to integration test all lighthouse clients (#9843, #10158)
smokehouse: add bundle.js runner for driving bundled lighthouse tests (#9943)
bundle smokehouse + bundle.js runner + bundled lighthouse for integration testing in a browser (#9873, #10727)
smokehouse: use ranges for some expectations to work in varying environments (#10227, #10473)
smokehouse: add static-server hook to modify response body (#9872)
smokehouse: adjust expectation handling and logging for compatibility (#10361)
smokehouse: commit copy of pwa.rocks for testing (#10648)
add type checking to driver-test (#10135, #10123)
add type checking to gather-runner-test (#10136, #10215, #10230)
fix i18n-test.js bugs in Node 13 (#10595)
i18n: add check of locale files for strings that are probably wrong (#9847)
use assert in strict assertion mode (#10606, #10733)
report-ui-features: add tests and remove interdependencies (#10199, #10201)
update coveragePathIgnore jest configuration (#10448)
speedline: remove flaky test (#10181)
remove global.URL for jsdom tests (#10186)
viewer-test: don't override puppeteer's chromium (#9877)
fix appveyor cache failures (#10281)
use lighthouse tarball for recipe tests (#10254)
stage viewer per PR with yarn now-build (#10151)

Misc

update license headers to credit Lighthouse Authors (#10469)
add timings-data/ to .npmignore (#10584)
update commitlint config to latest, loosen subject-case (#10371)
tweak CODEOWNERS for codereview assignment (#10265, #10274, #10282)
release script push tag (#10193)
add a bump-versions.js release script (#9998)
add comment about minimum chrome version for LCP (#9889)
update changelog order and add chrome note placeholder (#9859)
add .mailmap file (#10766)
add chrome version field to bug report template (#9866)
upgrade Lighthouse CI dogfood script (#9879, #9951, #9972, #10482)
updates and new features for internal compare-runs script (#10296, #10519, #10526, #10652)
add git3po scripts for managing Github issues and PRs (#10231, #10266, #10255, #10271, #10338, #10256, #10304, #10658, #10257)

Deps

lighthouse-plugin-publisher-ads: upgrade to 1.1.0-beta.0 (#10544, #10776)
chrome-launcher: upgrade to 0.13.2 (#9904, #10535, #10724)
yargs-parser: upgrade to 18.1.3 (#10723)
third-party-web: upgrade to 0.11.1 (#10711)
axe-core: upgrade to 3.5.3 (#10056, #10344, #10637)
typescript: upgrade to 3.8.3 (#10461)
puppeteer: upgrade to 1.20.0 (#10275)
bundlesize: upgrade to to 0.18.0 (#10272)
devtools-protocol: upgrade to 0.0.729809 (#10207)
check angular test fixture into repo (#10086)
remove mkdirp and make-dir for fs.mkdir (#9858)
update snyk snapshot (#10771, #10670, #10621, #10559, #10066, #9929, #10531, #10478, #10423, #10163, #9965)

6.0.0-beta.0 (2020-03-11)

Full Changelog

This beta release will not ship in Chrome DevTools, but we'll ship the final 6.0 release.

Notable Changes

Brand new metrics and performance score calculation (seeking feedback)
Lots more, complete release notes brewing..

See the 6.0.0 release notes for full changelog.

5.6.0 (2019-10-17)

Full Changelog

We expect this release to ship in the DevTools of Chrome 79.

New contributors!

Thanks to @dpacassi, @lirantal and @yeonjuan for their first contributions!

Notable

gather: add new MainDocumentContent public artifact (#9781)
stack-packs: add angular, react, amp, and magento packs (#9797)

Core

tracehouse: allow child to start <1ms before parent (#9786)
driver: fix error handling for Runtime.evaluate (#9831)
errors-in-console: add ignoredPatterns option (#9480, #9829)
image-elements: cache naturalSize results (#9818)
link-elements: ignore non-HTMLLinkElements (#9765)
optimized-images: log errors (#9782)
seo: support korean in link-text audit (#9804)
tracehouse: allow nested trace events without an end (#9785)
rename Element to LHElement (#9832)

Deps

update third-party-web to 0.11.0 (#9849)
snyk: update snyk snapshot (#9793)

Report

rephrase titles for 3rdparty & crc (#9419)
rewrite dom-size description (#9821)
update logo in top bar (#9728)
remove some dead code (#9800)

Clients

lr: don't include html report assets in bundle (#9828)
viewer: minify inlined report-generator bundle (#9596)

I18n

import: web.dev links and small corrections (#9846)
import translations (#9802)

Docs

related-projects: add lighthouse-check (#9753)
related-projects: add the is-website-vulnerable CLI tool (#9810)
related-projects: add the gradle lighthouse plugin (#9789)
document 'meaning' field in i18n readme (#9787)
update stale references to audits (#9760)

Tests

use firehouse smoke test runner to test bundle (#9791)
attempt bundle test three times in CI (#9830)
smokehouse: fix tmp directory creation (#9855)
smokehouse: use static requires for test definitions (#9501)

Misc

build: minify report javascript for lightrider report generator (#9823)
more releasing tweaks (#9772)
add compare-timings script (#9723, #9776)

5.5.0 (2019-10-02)

Notable changes

Preliminary implementation of the Largest Contentful Paint metric has landed (devtools and provided throttling only) and can be found in the hidden metrics audit in the raw LHR JSON (#9706)
The creation of main-thread tasks from a trace is now more robust. This should significantly reduce the occurrence of Issue #7764, "Fatal trace logic error - expected start event, got X" (#9491)
<script> element id has been added to the ScriptElements artifact (#9718)

New contributors!

Thanks to @LarsKumbier, @TimvdLippe, and @uchoudh for their first contributions!

Core

network-recorder: remove quic-request-finished workaround (#9744)
network-recorder: optimize network idle detection (#9712)
unused-css-rules: no more infinity savings (#9731)

Clients

devtools: expose registerLocaleData to worker (#9645)
devtools: update references to Runtime.cachedResources (#9758)

Docs

new documentation for running Lighthouse on authenticated pages (#9628, #9705)
point more docs links to web.dev (#9540, #9711, #9761)
readme: add more related projects (#9716, #9743)
releasing: add schedule, more integration testing (#9695)
add links to more info about throttling and variability (#9734)
update scoring calculator link to v5 (#9729)

Tests

add Lighthouse CI dogfood script to travis (#9677, #9745)
report: update utm_medium check for web.dev links (#9737)
smokehouse: add check for any runWarnings (#9732)
attempt to download lantern test trace set a few times (#9766)

Misc

devtools: remove version replacement for expectations (#9702)
remove unnecessary return in Promise (#9703)
assets: update logo (#9694)

Full Changelog

5.4.0 (2019-09-18)

Expected DevTools release in Chrome 79 (December 2019)

Core

iframe-elements: Include new IFrameElements gatherer (#8979)

Report

update favicon (#9688)

Docs

plugins: update recipe's lighthouse peerDependency version (#9653)

I18n

treat Infinity and NaN as numeric values (#9687)

Tests

smokehouse: fix unintentional 404, relax max-len (#9665)

5.3.0 (2019-09-13)

Expected DevTools release in Chrome 79 (December 2019)

New contributors!

Thanks to our new contributors @alabiaga, @olore, @letanure, and @mfriesenhahn!

Core

point audit descriptions to new web.dev Lighthouse docs (#9538, #9539, #9084, #9537)
constants: increase default maxWaitForFcp to 30s (#9509)
font-size: gather style declaration of type attributes (#9414)
gather-runner: only fail on interstitials interrupting the mainRecord (#9576)
lightwallet: add path property to budget.json (#9453)
seo: support portuguese in link-text audit (#9446)
start-url: stay offline for entirety of offlinePass (#9451)
third-party-summary: add blocking-time impact (#9486)
tracehouse: sort trace events by nesting order (#9230)
add source-maps gatherer (#9101)
unused-css: allow up to 10KB of unused CSS per file (#9479)

CLI

list audit categories in help text (#9399)

Clients

devtools: fix collapsing-width svg in flexbox (#9602)
devtools: update test command to run only .js files (#9532)
proto: don't filter channel from configSettings (#9554)
viewer: remove obsolete polyfills (#9553)
proto: update import hooks, obey line length (#9595)

Deps

chrome-launcher: update to 0.11.2 (#9515)
details-element-polyfill: update to 2.4.0 (#9552)
jsonlint-mod: update to 1.7.5 (#9465)
update transitive deps (#9670)

Docs

fix broken plugin example link (#9524)
lightwallet: add link to budget.json repo (#9579)

I18n

import translations from tc/ (#9577, #9620, #9454)
add registerLocaleData() method (#9638)
rewrite aria-required-children titles (#9590)
reword pwa-page-transitions description (#9615)
throw on excess placeholder replacement values (#9580)
remove translated messages when ICU arguments change (#9598)
use better types for intl-messageformat (#9570)
add code spans to uses-rel-preconnect description (#9568)
fix bugs in locale-importing scripts (#9621)
fix custom formatted ICU within plurals (#9460)
capitalize robots.txt displayValue (#9567)
add link to cldr parentLocales (#9520)
move pwa audits to i18n system (#9105)
use TypeScript compiler to collect UIStrings (#9487)
align type names with docs (#9461)
expand placeholder support (#9114)
rewrite td-headers-attr titles (#9587)
improve Intl polyfill and use it in Util (#9584)

Report

make dropdown match ARIA action menu button pattern (#9433)
move drop-down logic into a separate class (#9564)
topbar: fix overflowing url (#9497)
viewer: add option for loading from the PSI API (#9546)
viewer: fix favicon typo (#9629)
don't use unnessary monospace (#9626)
remove PWA badge flicker workaround for Chrome (#9636)
add utm params to web.dev links (#9555)
update favicon to new logo (#9591)
render unstyled json (rather than throwing) when LHR contains unknown details type (#9557)

Tests

migrate travis to xenial for modern Chrome support (#9654)
fixtures: use relative path in static server 404 page (d0e5c58)
report: add axe-core validation of report output (#9421)
add index page for static server (#9541)
smokehouse: use mime-types + proper encoding for response write (#9542)
retry cli tests up to 3 times in appveyor (#9512)
simplify serving of zone.js (#9672)

Misc

add comment on diff between document.write() audit and intervention (#9644)
refactor collect-strings to use glob and work on windows (#9406)
trim missed yarn.lock cruft & deduplicate dependencies (#9603, #9600)
replace deprecated uglify-es with terser (#9594)
share markdown parsing in collect-strings and the report (#9514)
add note about global.URL in node 10 (#9449)
build: include locale files in devtools roll (#9639)

5.2.0 (2019-07-24)

Expected DevTools release in Chrome 77 (September 2019)

New contributors!

Thanks to @AngeloGulina, @jamesgeorge007, @johnemau, @kaushikchaubal, @mitchellsimoens, @NickolasBenakis, @noelyoo, @PatOnTheBack, @rishichawda, and @Remexllee for their first contributions!

New Audits

Third-Party Usage, a new performance diagnostic that shows a breakdown of third-party resources in the page and the time/bytes needed to load them (#9067)
Total Blocking Time an experimental new metric that serves as a companion to TTI to help prioritize unblocking the main thread. Since it is currently experimental, it is unscored and appears only in the raw LHR JSON, not in the HTML report. (#8975, #9409)

Notable changes

tracehouse: performance trace processing has been moved to its own directory in lib/tracehouse/ to serve as a more standalone library (9f80524, 1af2edd, 7ba6776, ddff3d6)
certificate security errors are no longer a fatal Lighthouse error, though the Chrome error page will still return few results in the report by default. See the docs for testing a page in this situation. (#8865)

Core

support saving and loading errors in artifacts (#9397)
config: assert all audit requiredArtifacts will be gathered (#9284)
domstats: support an empty html body (#9340)
font-display: limit false positives (#9148)
font-size: calculate accurate line/column for styles (#9356)
font-size: comment why source 'Other' occurs (#9363)
localize invalid-URL error message (#9334)
gather-runner: add PageLoadError base artifact (#9236)
gather-runner: don't save trace on pass with pageLoadError (#9198)
gather-runner: treat Chrome interstitials as pageLoadErrors (#9176)
gather-runner: always reset scroll position (#9060)
gather-runner: convert PAGE_HUNG to non-fatal runtimeError (#9121)
manifest-parser: handle blob manifests (#9088)
page-functions: don't try to clone a ShadowRoot (#9079)
perf: speed up tap-target's isVisible() (#9056)
tracehouse: allow missing FCP (#9174)

CLI

accept flags from a file (#9109)

Clients

devtools: audits2->audits and defer reading resources (#8985, #9344)
devtools: unset overflow in print (#9274)
lightrider: update processForProto method signature, string -> LH.Result (#9016)
lightrider: serialize errors in artifacts (#9410)

Deps

update axe-core to 3.3.0 (#9343)
update typescript to 3.5.3 (#9357)
update chrome-launcher to 0.11.1 (#9339)
intl: move from devDep to dep (#9309)
update debug to 2.6.9 (#9398)
update to open from opn (#9267)
update outdated transitive deps (#9347)
update brfs to 2.0.2 (#9312)
remove commitizen as local dep (#9246)
update extend to 3.0.2 (#9184)
bump transitive dep js-yaml (#9131)
update bundlesize, add more budgets (#9089)

Docs

add i18n overview and authoring documentation (#9361)
link to good first issues (#9440)
add instructions for testing with self-signed certificate (#9112)
update understanding-results.md (#9226)
change score type from 'string' to 'number' (#9225)
readme: add Exthouse to related projects (#9243)
readme: add lighthouse-jest-example to related projects (#9172)
readme: add lighthouse-persist to related projects(#9161)
readme: add gimbal integration to related projects (#9083)
readme: update lighthouse-mocha-example related project (#9158)
readme: alphabetize related projects (#9110)
fix various typos (#9411)

I18n

introduce script to swap in new locale to LHR (#8755)
enable local debug locale, en-XL (#9192)
begin localization of audits in best-practices (#9092)
add es-419 (#9171)
localize column headers of budget audits (#9127)

Report

fix audit explanation rendering (#9439)
accessibility: add heading role to report category gauge (#9422)
add link to docs on performance scoring (#9355)
use full-bleed image thumbnails (#9238)
show disabled checkbox when all/no urls are third party (#9299)
remove unnecessary attribute in svg (#9301)
make urls clickable (#9224)
use css grid for metrics (#9273)
center and style top-level runtimeError (#9271)
create naming convention for css variables (#9149, 37f7261, ece89ec)
add aria-labels to tools button and metric toggle (#9201)
update permalink calculations for correct hash nav scroll position (#9188)
devtools: enable report UI features (#9157)
position sticky-header highlighter with css grid (#9186)
ensure SVG elements in <defs> have unique ids (#9151)
only print light theme (#9173)
make 'tools' menu focus-able (#9169)
rename 'exports' to 'tools' (#9135)
remove unused css vars (#9144)

Tests

relax contrast font size expectation (#9441)
font-size: assert on source (#9400, #9413)
assert vulnerable-library ranges have upper bounds (#9308)
i18n: update canonical locale test for node 12.6 (#9396)
i18n: throw when no ICU replacement value is given (#9384)
run CI with a frozen yarn.lock (#9362)
smokehouse: assert on expected array length (#9292)
smokehouse: always assert lhr.runtimeError (#9130)
tags-blocking-first-paint: make alternate stylesheets not blocking (#9248)
improve drag-and-drop test coverage (#9314)
clean up crufty gather-runner tests (#9227)

Misc

fix yarn.lock and translations master drift (#9404)
build: adjust deployment filenames (#9338, #9434)
build: create error-y LHR for the deploy (#9283)
network-server-latency: fix serverResponseTime typo (#9388)
localize logged GatherRunner error (#9291)
remove duplicate colon from regex (#9295)
runner: add assertion for devtoolsLog as requiredArtifact (#9290)
add yarn static-server script (#9293)
fix typo in performance-budget smoke test (#9244)
add .idea to .gitignore for WebStorm developers (#9275)
build: generate report variants in deployment (#9280)
suggest uploading issue repro (#9217)
use CHROME_PATH variable in CI and scripts (#9202)
update broken tracing-processor require (#9123)
address release script feedback (#9111)
release script should commit with format vX.Y.Z (#9090)

Full 5.2.0 Changelog

5.1.0 (2019-05-30)

Full Changelog

New contributors!

Thanks to our new contributors 👽🐷🐰🐯🐻! @thebengeu @boyney123

Core

gather-runner: treat NO_FCP as a pageLoadError (#8340)
logging: change log messages for gathering and trace retrieval (#9029)
tap-targets: don't exclude visible position absolute elements from audit (#7778)
budget: throw error on duplicate budget types (#8915)
config: split out config helpers (#9003)
gather-runner: always reset scroll position (reverted) (#8625)
image-elements: drop spritesheet logic (#8940)
refactor gather-runner control flow (#8964)
perf: speed up getNodePath (#9055)
performance-budget: add MP-FID as budget metric (#8905)
runner: fix missing timing properties in the browser (#9072)

Report

two rows for filmstrip on mobile (#8563)
move gauge styles to main stylesheet (#8893)
show metric descriptions by default when errors exist (#9054)
show fireworks only if all core categories score 100 (#9073)
make gauge font size and positioning dynamic (#9057)
hide 3rd party filter checkbox if all rows are 3rd party (#8966)
fix word breaking of display text, move metric disclaimer (#9030)
show nodeLabel for DOM nodes in addition to snippet (#8961)

Clients

devtools: move topbar out of scrollable container (#9077)
devtools: enable sticky header, top bar, and report ui features (#9023)
devtools: ignore dark mode media query (#9082)
devtools: update version in tests on lh roll (#8819)
lr: insert assets in lhr for logging purposes (#9002)

CLI

flags: accept comma-separated array values (#8933)

Docs

plugins: add link to field-performance plugin (#9051)
plugins: rename Google AdSpeed Insights to Publisher Ads Audit (#8906)
add lighthouse-plugin-field-performance to plugins (#9049)
add performance-budgets to related projects (#8971)

I18n

minor fr and ta translation updates (#8999)

Misc

assets: remove outdated extension screenshots (#9015)
dot-js require() everywhere (#9006)
remove unneeded reportCategories from LH.ReportResult (#9001)
update minify-trace scripts; extract to lib/ (#8968)
fix master: tmp revert of scroll change in #8625 (#9059)

Tests

lint: require file extension in require() (#9017)
update a11y sample artifacts (#9010)
remove compile-devtools on travis (#8988)
smoke: re-enable dialog prompt (#8894)

5.0.0 (2019-05-07)

Full Changelog

Major new features

Stack packs are a new way to present stack-specific advice wihin the Lighthouse report. This initial version detects if a site is running on WordPress and adds additional information to the report on how to take advantage of Wordpress plugins and configuration to improve performance. (#7243, #8169, #8633, #8536, #8778)
Performance budgets are a new feature of Lighthouse to help prevent your site performance from regressing over time. Set budgets for the resources a page should load and have Lighthouse alert if the budgets aren't met. (#8539, #8522, #8727, #8709, #8427, #8708)
The HTML report has been redesigned!

New Audits

apple-touch-icon PWA audit (#8857)
max-potential-fid (new in HTML report) (#8729, #8817)
performance-budget (#8539)
resource-summary (#8522)

Breaking changes

Node 10 (LTS) or later is now required. (#8117)
rawValue has been removed from audit results. If the audit had a meaningful numeric result (like a metric), this result will now be on numericValue. (#8343, #8385, #8421)
The accessibility category scoring has been reweighted based on severity. (#8823)
FCP accuracy has improved (in 'simulation' throttling) and may noticeably affect scores. (#7513)
The deprecated --disable-device-emulation flag has been removed. Use --emulated-form-factor. (#8289, #8334)
The dom-size now ignores elements in <head> and limits scoring to only DOM nodes in the body. (#7241)
The diagnostics audit details have had their type value changed to debugdata (#8298)
The format of the screenshot-thumbnails screenshots has changed. They are now a full image data URL. (#8299)

New contributors!

Thanks to @arnabsen, @housseindjirdeh, @MarkelFe, @muuvmuuv, and @Meggin for their first contributions!

Core

a11y: disable unused axe rules (#8373)
artifacts: create a PublicGathererArtifacts type (#8382)
runner: only pass requiredArtifacts to audits (#8760)
crc: redirects leading to iframe shouldn't be marked as critical (#6704)
driver: enable async stacks (#5504)
font-display: do not use invalid sourceURLs (#8535)
jsonld: structured data validation updates (#8137)
rect-helpers: make getBoundingRect take an array of rects (#8789)
seo: support spanish in link-text audit (#7547)
filter blob urls from more audits (#8724)
reword insecure error message (#8530)
seo: add image-alt to SEO category (#8407)
add devtoolsNodePath property to ScriptElements artifact (#8133)
always run axe gatherer last (#8216)

Report

redesign: three dots for export button (#8629)
redesign: design review feedback (#8785)
redesign: whitespace, font weights (#8820, #8891, #8592, #8591, #8531, #8528)
make v5 renderer compatible with v3 and v4 LHRs (#8822)
redesign: fireworks (#8660)
redesign: add toggle control to show metric descriptions (#8661, #8844)
add table filter for third-party urls (#6351)
redesign: remove units from table column headings (#8658))
redesign: hide sparkline in mobile (#8562)
redesign: add dark theme (#8425, #8843, #8845, #8842)
redesign: add sticky scores header (#8524, #8883)
redesign: runtime settings footer (#8229)
add missing (#8240)
redesign: new gauges, score scale, category headers, variables (#8121, #8300, #8329, #8307, #8222, #8529, #8532, #8590, #8653, #8720, #8722, #8763, #8872)
extract init() function from report-template (#8228)

Clients

devtools: remove ascii-encoded asset requirement (#8456, #8637)
lr: increase Page.getAppManifest timeout to 10s (#8350)
lr: apply, revert Lightrider timings to NetworkRequests (#8109, #8752)
psi: pass score scale element to psi (#8827)
lr: build report-generator-bundle (#8197)

Docs

update throttling (#8854)
add plugin guide (#8728)
readme: add mention of free tier of Foo integration (#8160)
readme: remove link to archived lighthouse-security project (#8141)

CLI

always handle chrome connection errors (#8583)
document that CSV is output to file (#8520)

Deps

chrome-launcher@0.10.7 (#8781)
axe-core@3.2.2 (#8370)

Tests

lightwallet: add perf-budget smoke test (#8853)
lightwallet: add budget to sample artifacts config (#8783, #8870)
add tap targets to dobetterweb sample page (#8803)
make update:sample-artifacts work for a single artifact type (#8802)
smokehouse: capture microtask regression (#8379)
smokehouse: support artifacts assertions in smoke tests (#8044)
smokehouse: fix tests from sharing artifacts (#8897)
smokehouse: change metric assertions from score to numericValue (#8805)
fix sample_v2 generation, proto errors (#8605)

I18n

import tamil translated strings (#8886)
SEO group titles and descriptions (#8719)
stack pack translations (#8154, #8415)
update seo group titles and descriptions (#8378)

Misc

proto: require protobuf 3.7.1, add stricter audit details test (#8863, #8867)
proto: remove trailing whitespace; add contributing help (#8818)
fix roundtrip sample_v2.json (#8815)
rename release scripts properly (#8751)
simplify LH.Config settings types (#8630)
add correct listitem.js @fileoverview (#8586)
update sample_v2 artifacts (#8243)
ci: build report and deploy to now.sh on every commit (#8194)
fix bad auto-merge (#8201)
update collected i18n string (#8158)
--help: remove screenshots mention from --save-assets (#8263)
lightwallet: update budget link (#8871)
fix common typos (#8726)

4.3.1 (2019-04-30)

Full Changelog

Core

support traces missing TracingStartedInBrowser (#7122)
driver: only fail security state if scheme is not cryptographic (#8338)

Clients

extension: remove github link in favor of copy to clipboard (#8294)

Deps

snyk: update snyk snapshot (#8354)

Misc

add releasing scripts (#8387)

4.3.0 (2019-04-08)

Full Changelog

New contributors!

Thanks to @rdlabo and @yashrajbharti for their first contributions!

Report

include utm params in links to docs (#7441)
fix PWA badge from disappearing on scroll (#7512)

Core

artifacts: rename Scripts to ScriptElements artifact (#7920)
canonical: move canonical audit to LinkElements (#7080)
font-display: handle carriage returns (#7712)
font-display: ignore data URLs (#7684)
image-aspect-ratio: ignore css background images (#7516)
jsonld: add structured data validation (#6750)
lhr: truncate measure timings to hundredths (#7748)
logging: don't log when closing already closed page (#7576)
main-thread-tasks: improve event-order error messages (#7745)
main-thread-tasks: handle last task not finishing (#7728)
main-thread-tasks: use toplevel tasks in main thread audit (#7711)
oopif: attach to all descendants (#7608)
oopif: skip OOPIF network records in some gatherers (#7640)
optimized-images: cap execution to 5 seconds (#7237)
settings: add lighthouse channel (#7312)
remove hreflang gatherer (#7477)
tap-targets: exclude sticky elements from tap targets audit (#7603)
vuln-libs: match against all semver ranges provided by snyk (#7402)
uses-http2: ignore requests from service-worker (#7197)

Docs

add plugin recipe (#6965)
readme: Foo integration (#8035)
url-shim: add comment about public suffix lst (#7671)

Clients

devtools: refactor build script (#7421, #7567)
lr: always use transferSize from X-TotalFetchedSize header (#7478)
lr: gather network timing numbers from headers (#7888)
lr: add custom config support (#7613)

Tests

better fatal trace logic error coverage (#7959)
fix test coverage generation (#7475)
finish removing mocha (#7429)
upgrade jest to fix current node 11 build (#7413)
smoke: remove trivial uses of rawValue from expectations (#7780)
smoke: set Content-Type for files served by static-server.js (#7612, #8015, #8078)

Misc

chore: remove old dep postinstall-prepare (#7647)
remove unused typedef (#8075)
specify types for some dependency-graph options objects (#7962)
simplifications in simulator/connection-pool (#7894)
drive-by code cleanup in BaseNode (#7723)
remove lhr-lite.d.ts (#7991)
remove obsolete Util.formatDisplayValue (#7628)
various spelling fixes (#7370, #7492, #7427)
fix unit-viewer command for windows (#7624)
remove obsolete unused files (#7476)
cli: add --plugins flag to load from the command line (#7407)
gather: update comment re: ClientRect copying (#7785)

Deps

update nyc to latest (#7431)
snyk: update snyk snapshot (#7392, #7589, #7943)

I18n

Hindi for seo and a11y (#7786, #8070)
add new translations for SEO; updates for a11y and perf (#7720)

4.2.0 (2019-03-06)

Full Changelog

New contributors!

@pra85, @tgfjt, @gidztech and @jburger424. Thank ya!

New Audits

tap-targets: verify tap targets are well sized and distinct (#5846)

CLI

write report in runLighthouse before quitting Chrome (#7339)

Core

fid: add Max Potential FID to JSON (#5842)
artifacts: unify AnchorElements into single gatherer (#7101)
artifacts: include inline scripts in Scripts artifact (#7065)
artifacts: create ViewportMeta computed artifact (#7264)
artifacts: add TestedAsMobileDevice base artifact (#7280)
bootup-time: better attribution (#7059)
byte-efficiency: use more optimistic GZIP ratios (#7210)
cache-headers: fix typo in must-revalidate (#7189)
details-renderer: add snippet details renderer (#6999)
diagnostics: add diagnostic audits (#7052)
driver: add waitForFCP timeout (#7356)
driver: collect network requests from out-of-process iframes (#6922)
driver: add ' Chrome-Lighthouse' to useragent (#7297)
emulation: bump chrome useragent to m74 (#7211)
fcp-3g: remove unused i18n for LR compatibility (#7103)
font-display: more accurately follow CSS spec (#7191)
image-elements: cap natural-size fetch time (#7274)
lantern: add configuration for precomputed network analysis (#7239)
lhr: include resourceSize in network-requests audit (#7056)
manifest: remove Manifest artifact in favor of new WebAppManifest (#7078)
metrics: do not fail if TTI fails (#7132)
network-analysis: set additional RTT to 0 not NaN (#7156)
network-recorder: redirects started by script are set as initiators (#7352)
plugins: add support for groups (#7304)
seo: remove manual mobile-friendly audit (#7223)
seo: add rel=canonical test for auditing a domain root (#7228)
tap-targets: disable font size and tap targets audit on desktop (#7393)
tap-targets: make tap targets failures more visible (#7373)
tsc: fix audit details type hierarchy (#7177, #7154, #7285)
unused-css: change title Defer -> Remove (#7235)
give sort fallback for broken test details in node 11 (#7216)
suppress protocol timeout for app manifest bug in LR (#7184)
optimize tap-targets audit (#7130)
remove NO_ERROR runtimeError when no error (#7358)

Deps

snyk: update snyk snapshot (#7277, #7233, #7167, #7116)
updates to weed out transitive vulnerabilities (#7319)
update cssstyle to parse more named colors, CSS4 colors (#7283)

Docs

contributing.md: fix typos (#7170)
fix throttling rate comment and tweak comcast bandwidth (#7374)
improve explanations of extending and using config files (#7354)
update throttling docs to public version (#7332)
readme: add lighthouse-keeper to integrations (#7399)
docs(related-projects) add react-lighthouse-viewer (#7262)
readme: Add Fluxguard to the list of integrations (#7249)
variability: add dedicated variance doc (#7175)

I18n

fix max potential FID description (#7353)
ICU syntax correction (#7320)
seo strings prepped for i18n (#6860)
translate strings in the tap-targets audit (#7111)
a11y category title and description (#7113)
import translated accessibility and lh-error messages (#7008)

Report

reorganize a11y audit groups (#7129)
clip exceptionally long URLs in the header (#6858)
details-renderer: use new audit-details types (#7192)

Tests

refactor driver, more gotoURL tests (#7270, #7242, #7212)
run node 11 in CI (#7230)
replace non-volatile snapshots with inline literals (#7217)
smokehouse: refactor to enable Smokerider (#7284)
smokehouse: +/- operator (#7343)
smokehouse: gzip test to assert transfer and resource sizes (#7286)
smokehouse: fail on finalUrl/errorCode mismatches (#7227)

Misc

tap-targets: remove lines with trailing whitespace (#7105)
clean node_modules/.cache before travis builds its cache (#7388)
convert Flags comments to jsdoc for better intellisense (#7359)
export UA strings from emulation.js (#7318)
fix typo in comment (#7296)

4.1.0 (2019-01-28)

Full Changelog

New contributors!

@castilloandres you da man, man.

Core

font-size audit: count code points for text length (#6973)
cache headers audit: ignore private, must-validate, no-cache (#6835)
introduce Lighthouse plugins (#6959)
new audit: add FCP on 3G (#7062)

Refactor

refactor meta element artifacts to single meta-elements artifact (#7025)
images: cleanup ImageUsage to match other *Elements artifacts (#7030)
add baseArtifacts (with new WebAppManifest) to passContext (#6957)
use async/await in evaluateAsync (#7038)

Report / Viewer

renderer: do not attempt fireworks for devtools (#7090)
viewer: allow loading RunnerResult json (#7031)

Misc

readme: Add DebugBear to the list of integrations (#7036)
snyk: update snyk snapshot (#7079)
viewer: fix types to reference LH.Result (#7051)
replace TODOs with github issue links (#7049)
fix extension package path and viewer comments (#7032)

4.0.0 (2019-01-16)

New contributors!

@mattzeunert, @dima74, @jeffbcross, @knoxmic, and @shogunsea. Thanks!

Major changes

A bevy of bug fixes and performance improvements.
A special reward for getting a perfect score.
A new layout for the PWA category, emphasizing speed, installability, and polish.

Breaking changes

New PWA category, organization, and scoring (#6395)
- the PWA section of the report has a set of badges instead of a numeric score gauge (#6526, #6670)
- the webapp-install-banner audit is now installable-manifest (#6630)
- the offline check formerly in webapp-install-banner is the new audit offline-start-url (#6397)
audits' scoreDisplayMode 'not-applicable' is now 'notApplicable' (#6783)
no-websql audit removed due to performance cost (#6293)
speed-index scoring now scales based on throttling (#7007)
empty children arrays are now removed from critical-request-chain audit result (#6211)
the correct Nexus 5X screen height of 660 now used instead of 732 (#6932)
throttling constants under mobile3G renamed to the more accurate mobileSlow4G with no change in values (#6163)
typescript definition files are now located under types/ (#6617)
computed artifact files are now located under lighthouse-core/computed/ (#6618)

Full Changelog (in addition to the changes in 4.0.0-beta, 4.0.0-alpha.1, and 4.0.0-alpha.0)

Core

config: reorder categories to match new score gauge order (#6848)
driver: handle navigation rejections within Driver.gotoURL (#6739)
driver: exit early when testing page with insecure certificate (#6608)
driver: waitForFCP when tracing (#6944)
handle invalid network timing data (#6780)
fix usesObjectFit property for ImageElement (#6761)
fonts: resolve URLs relative to stylesheet (#6782)
lantern: remove unnecessary sort calls (#6900)
lantern: drop node id from error message (#6774)
minification: properly handle regex character classes (#6745)
preconnect: add warning if preconnect link is not used (#6694)
preload: warn when duplicate requests issued (#6849)
scoreDisplayMode: change 'not-applicable' to 'notApplicable' (#6783)
service-worker: check that start_url is within SW's scope (#6678)
speedindex: scale scoring coefficients based on throttling (#7007)
tap-targets: helper functions for working with ClientRects (#6703)
url: add intent protocol to NON_NETWORK_PROTOCOLS (#6711)
user-timings: move into computed artifact (#6719)
change displayValue to be string only (#6767)
add type checking to pwmetrics-events (#6980)
stricter LR-desktop metric scoring (#6969)
in-page functions refactor (#6702)

Deps

update axe-core to latest (#7020)
update details-element-polyfill to 2.2.0 (#6928)
update tsc to 3.2.2 (#6684)
snyk: update snyk snapshot (#6888, #6842)

Docs

readme: add speedrank to integrations list (#6987)
readme: added simple guidance on install options (#6810)
configuration.md: update link to pwmetrics (#6816)
scoring: update TTI references (#6865)
--help: use HTTPS link to bit.ly/chrome-flags (#6692)
ask people to test a11y issues upstream first (#6764)

Extension

return runnerResult from runLighthouseInExtension() (#6839)

I18n

localize LighthouseError messages (#6457, #6812)

Report

pwa: add tooltip to badge gauge (#6689)
add top-level section for passed audits that had warnings (#6989)
celebrate all 100s (#5455)
expand groups within "Passed Audits" by default (#6930)
fix margin on score gauge wrappers (#6948, #6972)
support narrow screens (#6857)
larger margins for audit group summaries (#6688)
clean up more clump/group/expandable cruft (#6982)

Tests

smokehouse: assert errorCode in expectations (#6851)
smokehouse: use node's native URLSearchParams (#6929)
add type checking to cli/tests/ (#6874)
report: restore old, disabled failed grouping test (#7006)

Misc

descriptions: more accurate metric descriptions (#6508)
emulation: use correct Nexus 5X screen size (#6932)
snyk: only keep vuln data for detectable libs (#6919)
clean up local names within Config (#6950)

4.0.0-beta (2018-11-29)

Full Changelog

Core

service-worker: check that test page is in SW scope (#6609)
throw fatally on page hang (#6497)
define new DNS failure LH Error (#6579)
assert securityIssues before getPageLoadError (#6578)
remove protocol timeout for Page.navigate (#6413)
rename webapp-install-banner audit to installable-manifest (#6630)
computed-artifacts: fix cache and add perf timing (#6619)

Report

add PWA category badge gauge (#6526, #6670)
give passed-opportunities group an icon (#6594)
safari: fix dropdown overlap translateZ (#6546)
use details-element-polyfill from node_modules (#6593, #6607)

CLI

exit and kill Chrome on unhandledRejection (#6394)

Tests

add smoketest for slow service worker (#6648)

Misc

tsc: infer dom.createElement type from tag name (#6637)
rename core/gather/computed/ to core/computed/ (#6618)
rename typings/ to types/ (#6617)
bump extension version (#6569)

4.0.0-alpha.1 (2018-11-15)

Full Changelog

Core

skip h2 audit in LR (#6564)
config: faster category validation (#6445)
driver: wait for Page.frameNavigated for about:blank (#6446)
lib: add chrome-extension to URL allowedProtocols and add test (#6447)
pwa: audit and report group renames (#6494)
seo: properly handle anchors in SVG (#6483)
increase protocol timeout to 30s (#6505, #6531)

Report

pwa: give badges to groups with all passing audits (#6504)
pwa: add pwa-category-renderer (#6486)
compat: add details-element polyfill for Edge (#6465)
compat: fix support for edge (#6459)
compat: ignore Edge's Invalid Argument error (#6456)
compat: fix summary rendering in FF (#6448)
handle underscored not_applicable scoreDisplayMode (#6549)
css: make performance category more compact (#6437)
rename clump classes; give classes to all audit groups (#6482)
refactor rendering of top-level failed/passing/etc clumps (#6460)

Misc

build: fix viewer deploy (#6449)
timing: move timing-trace to async events (#6440)
update puppeteer to version 1.10.0 (#6493)
readme: use official appveyor badge (#6443)
i18n: convert accessibility audits (#6229)

4.0.0-alpha.0 (2018-10-31)

Full Changelog

New Contributors!

Thanks to @carlesnunez and @justin0022 for their first contributions!

Thanks to @CodeDem for improving how the image-aspect-ratio audit handles small images!

Huge thanks to myself (@Hoten) for joining Lighthouse! Go me!

New Audits

offline-start-url (#6397)

Core

aspectratio: ignore placeholder images (#6305)
audit: add utm parameters when calling snyk (#6172)
audits: clarify diff between load-fast-enough-for-pwa's TTI and perf TTI (#6286)
axe: disable unused audits (#6180)
computed: fix new computed artifact interface (#6151)
config: add new PWA category groups (#6396)
critical-request-chain: remove empty children from LHR (#6211)
driver: save performance.now() to avoid conflict (#6387)
driver: request smaller trace in m71+ (#6117)
driver: stringify protocol error messages (#6302)
driver: address bckenny feedback on #6117 (#6285)
driver: reduce required traceCategories again (54baf91)
driver: recover from rejection on handleJavaScriptDialog (#6327)
emulation: fix missing space in mobile UA (#6161)
icons: defer to manifest-icon type hint for image type (#6230)
network: handle invalid NetworkRequests (#6157)
network-analyzer: move throughput to NetworkAnalyzer (#5900)
perf: add timing instrumentation to measure runtime perf (#3745)
proto: add proto definition for LHR (#6183)
simulator: start nodes in observed order (#5362)
unminified-javascript: replace esprima with custom tokenizer (#5925)
remove recoverOrThrow / err.fatal (#6343)
convert computed artifact loading to regular require() (#6204)
remove no-websql audit (#6293)
bail on run if insecure ssl certification (#6300)
make throttled offscreen-images work without TTI (#6039)
save HTMLElement.p.matches function to avoid conflict (#6283)
remove fonts gatherer, move font-display to use CSSUsage artifact (#6166)
remove last dependency on WebInspector (#6209)
add timeout to all protocol commands (#6347)
don't load blank page twice in first pass (#6369)
refactor finding of trace start (#6370)
increase Page.navigate timeout (#6412)

Report

fix tooltip hover animation (#6288)
reframe Fast 3G as Slow 4G (#6163)
fix html report viewing bugs for Safari (#6143)
dom-size: right-align the value column (#6372)

Clients

simplify viewer build process (#6426)
reorganize file structure and build process (#6344)
build: ignore all locales from devtools & extension build (#6170)
lr: skip early emulation now that lr-desktop is defined (#6158)
split browserifying and extension packaging into separate scripts (#6295)
simplify bundle building (#6282)
stop report bug prompt for file:// urls (#6278)

Deps

update typescript to latest patch release (#6235)
update to tsc 3.1.1 (#6126)
jsdom: upgrade to support Element.prototype.closest (#6411)
snyk: update snyk snapshot (#6377)

Docs

contributing: consistent capitalization (#6174)
new-audits: revise issue template (#6233)
readme: Add new related project, lighthouse-github-reporter (#6307)
readme: change image references be commit hash raw gh urls (#6116)
add primer on viewing the timing data (#6393)
typo fix (#6335)
Remove "sh" format for CLI --help output (#6311)
update docs for --output-path re: multiple output types (#6339)

I18n

roll latest messages from TC (#6388)
update test for new canonical locale codes (#6360)

Tests

use predictable numbers in golden LHR (#6404)
add basic sentry tests (#6308)
restore lr-entry test (#6214)
remove more mock computed artifacts (#6195)
add trace creator (#6196)
add networkRecord-to-devtoolsLog mocking utility (#6171)
add angular test for JS minification (#6138)
run node 10 on Travis (#6361)

Misc

tweaks for devtools client (#6127)
simplify proto npm scripts (#6406)
add cli module diagram (#6129)
keep download-chrome script in npm package (#6153)
lantern script path resolution fix (#6380)
add integrity data to yarn.lock (#6212)
add yarn integrity hashes for extension/viewer (#6277)
only allow 1 error from each audit/gatherer (#6215)
Revert "core(driver): stringify protocol error messages (#6302)" (#6328)
fix typo in feature request template (#6431)
remove plots/ (#6346)
build: cleanup extension package zip using gulp (#6210)
build: rename bundled files (devtools/ext/lr) (#6179)
eslint: enforce infix-op spacing (#6382)
logger: isVerbose(), getTimeEntries() (#6383)
logging: add hanging request logging in driver (#6297)
proto: made default LighthouseError enum 'UNDEFINED' (#6334)
proto: align proto whitespace (#6374)
proto: convert int32's into DoubleValue in proto (#6332)
proto: adjust configSetting.output in preprocessor (#6310)
proto: add audit_mode and timings (#6363)
proto: fix linting and add LR hook (#6373)
proto: make NO_ERROR default in proto (#6358)
proto: reduce configSettings in proto to minimum (88b2829)
yarn: update lockfile for micromatch (#6384)

3.2.1 (2018-10-01)

Full Changelog

Core

emulation: set desktop viewport to 1350x940 (#6131)
await js-libraries detection (#6141)

3.2.0 (2018-09-27)

Full Changelog

New Audits

add js-libraries audit, just listing detected js libs (#6081)

Faster

driver: deliver trace as events rather than a stream (#6056)
network-recorder: consider iframe responses finished. helps avoid pageload timeout (#6078)
replace WebInspector traceparser with native JSON.parse (#6099)

Core

add emulatedFormFactor setting (#6098)
remove some trivial uses of WebInspector (#6090)
use cssstyle to parse CSS colors instead of WebInspector (#6091)
initial refactor of computedArtifact import/caching (#5907)
asset-saver: stop creating screenshot files during --save-assets (#6066)
content-width: not applicable on desktop (#5893)
driver: add check to make sure Runtime.evaluate result exists (#6089)
icons: Add PNG check to manifest icon validation (#6024)
lhr: add top-level runtimeError (#6014)
- gather-runner: include error status codes in pageLoadError (#6051)
- smooth rough edges of pageLoadError display and reporting (#6083)
net-request: transferSize now shared via 'X-TotalFetchedSize' (#6050)
don't allow analysis of file:// urls (#5936)

Report

dont show zero ms savings in preconnect, preload audits (#5983)
align table headings & columns left/right (#6063)
audit: make dom-size table prettier (#6065)
cursor:pointer on Passed Audits, etc (#5977)
psi: remove redundant varience disclaimer (#6110)
util: ✅ audits should be in Passed Audits (#5963)
vulnerable-jslibs: tweak snyk link for highlighted matches (#6096)
xbrowser: replace Typed OM getComputedStyle() with CSSOM equivalent (#5984)

CLI

add --print-config flag (#6107)

Deps

snyk: update snyk snapshot (#6074)
chrome-launcher@0.10.5 (#6106)
js-library-detector@5.1.0 (#6102)
speedline@1.4.2 (faster sort) (#6073)
chrome-devtools-frontend@latest (#6101)

Docs

readme: add lighthouse4u (#6008)
readme: updated report screenshot to 3.1.0 (#6042)
readme: add lighthouse-badges to related projects (#5969)
recipes: update custom-audit package.json (#6007)
releasing: minor updates (#5345)

i18n

roll latest strings from TC (#6109)
mv locale files (#5981)
speed up replacement regex (#6072)

Misc

bump bundlesize threshold a little more (#6055)
runner: added locale to settings that can change between -G and -A (#6080)
tsc: add type checking to sentry usage (#5993)

3.1.1 (2018-09-07)

Full Changelog

update report score legend to match updated color buckets (#5985)

3.1.0 (2018-09-06)

Full Changelog

New Contributors!

Huge thanks to @midzer and @justinribeiro for being so darn helpful. Great stuff. :D

And thanks to @mettamatt for some helpful documentation. Who doesn't love better docs?!

Notable changes

red/orange/green color buckets for scores are tougher now. (#5831)

	Previously	Now
Red (bad)	0-44	0-49
Orange (average)	45-74	50-89
Green (good)	75-100	90-100

Scoring itself hasn't changed; only what color is used to decorate a score.

trace-processor: fix bug where top-level events weren't being found in the trace (#5841)

Core

normalize URL before checking equality (#5960)
expose LighthouseRunWarnings on audit context (#5684)
adjust audit titles for consistency (#5717)
export any page-functions as string (#5902)
all ByteEfficiency audits require a trace (#5840)
enhanced noopener output (#5857)
errors: class rename and re-source page load errors (#5972)
fix defaultConfig UIStrings and exit code for test (#5884)
remove last debugString references (#5856)
redirects: update redirects to use OpportunityDetails (#5791)
warn when extensions affected perf (#5666)
driver: handle when page redefines global.URL (#5748)
gather-runner: call clearDataForOrigin on teardown (#5933)
lhr: expose environment info (#5871)
lr: add LR presets for desktop and mobile (#5886)
lr: drop maxWaitForLoad 45 -> 35 (#5938)
network: handle LR transferSize (#5895)
network-analyzer: infer RTT from receiveHeadersEnd (#5694)
optimized-images: support non-standard mime types (#5688)
preload: remove CRC dependency (#5901)
screenshot-thumbnails: improve caching (#5976)
ttfb: reuse requestMainResource (#5657)
trace-of-tab: only use navstart of chrome/http documents (#5917)
tracing-processor: throw on no top level events (#5878)
uses-long-cache-ttl: handle multiple cache-control headers (#5745)

Extension

access core through module instead of Runner (#5855)
tweak runLighthouseAsInCLI jsdoc (#5812)
refactor option/flag passing (breaking change) (#5769)
remove X-UA-Compatible meta (#5739)
popup: keep feedback class (#5872)

i18n

add i18n 'type' for prlint (#5880)
minor message and description changes based on translator feedback (#5829)
reframe the ICU message descriptions with placeholders (#5737)
export rendererFormattedStrings (#5713)
extract performance category strings to UIStrings (#5716)
always use english for status logs (#5727)
add 'ln' locale which maps to 'fr' (#5879)
support descriptions (#5718)
add [ICU Syntax] label to relevant message descriptions (#5736)
import psuedo-locale json from TC (#5726)
incorporate 52 languages into messages pipeline (#5781)
add descriptions to UI strings (#5743)
add strings of the opportunity group split (first paint, overall) (#5744)
add locale fallback when language not supported (#5746)
localize strings at end of run (#5655)
always use formatted strings for extension popup (#5761)
add strings for user timing entries table (#5806)
sort the ICU messages when saved (#5771)
roll latest TC messages (#5802)
add localized messages for 52 locales (#5780)
add assertion script (#5686)
report: use LHR locale for toLocaleString (#5734)
report: localize CRC renderer strings (#5730)

Types

don't use index signature in LHErrors (#5896)
type check config files (#5858)
don't use index signature in simulator.js (#5897)
update debugger protocol type checking (#5836)
remove more reliance on implicit index signatures (#5874)
update types in emulation.js (#5830)
tighten traceOfTab timing types (#5887)
update to ts 3.1 to support new protocol defs (#5942)
update to latest tsc (#5581)
NetworkRequest.RESOURCE_TYPES type fix (#5851)
add explicit index signature in mainthread-work-breakdown (#5859)
cli: make LH.Flags type correct and consistent (#5849)

Report

link to our own "unused css" reference doc (#5698)
expose prepareLabData directly as a fn (#5818)
responsive styles (#5706)
add PSI.prepareLabData() (#5804)
adopt 80-char line-length license (#5757)
add method to get the final screenshot (#5673)
metrics: display metrics in seconds (#5914)
psi: add Util.prepareReportResult method (#5766)
psi: reset template styles on every call of prepareLabData (#5877)
psi: add lab data summary sentence (#5961)

New Audits

a11y: add manual audit for interactive element affordance (#5764)

Tests

quiet down collect-scripts during CI (#5801)
better display value tests with i18n (#5720)
dbw: remove createShadowRoot call (#5906)
jest: disable coverage collection by default (#5772)
smokehouse: update expectations for HTML Imports deprecation (#5943)
smokehouse: update passive listener expectations (#5899)

Deps

snyk: update snyk snapshot (#5774), (#5773), (#5762), (#5691)
depend on speedline-core, rather than the cli (#5800)

Docs

headless: Require Node 8 and apt install chromium (#5974)
headless: example script to post report as gist (#5975)\
integrations: Add SpeedCurve to "Lighthouse Integrations" (#5732)
link FCP audit description to lighthouse docs (#5850)
puppeteer: remove appMode mention (#5923)
readme: mention chrome-flags troubleshooting in getting started (#5916)
report: add a renderer readme (#5725)
scoring: http2 redirect PWA score issue (#5929)

Misc

cli: enableErrorReporting must be undefined by default (#5854)
asset-saver: tweak output format of logAssets (#5696)
logger: add time/timeEnd methods (#5905)
fix grocers apostrophe typo (API's v APIs) (#5948)

3.0.3 (2018-07-17)

Full Changelog

Core

emulation: use setTouchEmulationEnabled (#5661)
response-compression: graceful recovery (#5578)
simulator: add DNS timing (#5607)

Misc

convert strings to NetworkRequest.TYPES (#5674)
sentry: lower "could not load stylesheet" sampling to 0.01 (#5677)

3.0.2 (2018-07-11)

Full Changelog

New Contributors!

Thanks to @schalkneethling and @eduardosada for their first contributions!

New Audits

assert a present and valid doctype (#5274)

Core

fonts: bump gatherer timeout to 5s (#5643)
network-request: cleanup DevTools property names (#5606)
preload: remove blob protocol from preload audit (#5409)
without-javascript: allow noscript pages (#5571)

Docs

architecture: add diagram of module dependencies (#5615)
custom-audit: update custom-audit to 3.0.0 api (#5612)
[minor] issue template tweaks (#5641)

Extension

fix "extension Error: couldn't resolve current tab" (#5591)
3.0.0 as well (#5584)

Tests

[minor] rename robots.txt test file (#5610)
run the golden LHR check earlier (#5609)

Misc

scripts: more succinct lantern output (#5523)

3.0.1 (2018-07-02)

Full Changelog

Core

fonts: handle CORS cssRules (#5592)

Tests

adopt jest (leaving mocha) for core & cli (#5386)

3.0.0 Final (2018-06-29)

Changelog of v3.0.0-beta.0 to 3.0 final

New Contributors!

Thanks to @underbyte, @nourikhalass and @ernstmul for their first contributions! Awesome stuff.

Core

a11y: add back html/tags/impact (#5439)
audit: align meta properties with LHR (#5540)
audit-mode: do not require a URL (#5495)
driver: [minor] fix spelling of evaluate (#5553)
fcp: fix scoring curve (#5507)
image-aspect-ratio: loosen ratio check (#5358)
lhr: migrate opportunity details to new format (#5296)
main-resource: work with hash URLs (#5422)
multi-check: expose manifest checks in details (#5405)
network-requests: handle negative endTime (#5530)
offscreen-images: add lantern filter (#5361)
opportunities: more granular score (#5331)
preload: only allow same origin (domain + subdomains) (#5065)
pwa: revamp and move short_name_length audit (#4860)
pwa: adjust score weights (#5233)
faster saveTrace by streaming 500 events at a time (#5387)
convert requestIds before sending to backend (#5580)
remove dependency on DevtoolsTimelineModel (#5533)
remove no-mutation-events audit (#5509)
remove WebInspector.resourceTypes references (#5556)
[minor] migrate remaining .description -> .title (cee9d55)
support traces with TracingStartedInBrowser event (#5271)
remove dependency on devtools-frontend NetworkRequest (#5451)
convert gather-runner.js to async/await (#5462)
handle DOM.resolveNode errors (#5427)
split out BaseArtifacts, those always provided by LH itself (#5506)
simulator: convert node timings to trace (#5350)
simulator: improved timing typedef (#5347)
trace-of-tab: remove DevTools stableSort dependency (#5532)
traces: move findTracingStartedEvt to tracingProcessor (4826a77)
tsc: make CPUNode and NetworkNode a discriminated union (#5548)
tsc: use Config class to define Config type (#5525)
tsc: add initial trivial type info to config.js (#5481)
tsc: refactor config.js (and add type checking) (#5486)
tsc: migrate renderer & viewer off typedefs to .d.ts (#5342)
user-timings: add back startTime (#5442)

Deps

bump gulp's natives dep for node 10.4 compat (#5497)

Docs

update required chrome version (#5425)
update docs for v3 (#5357)
audit: add jsdoc descriptions to the audit meta properties (#5567)
readme: lighthouse-ci (#5410)
scoring: update metric explanations (#5528)

Extension

popup: integration test for popup (#5412)
tsc: add type checking to extension entry points (#5346)
expose devtools hooks reliably (#5579)
allow use of ES2018 features (#5377)
update minimum Chrome version to 66 (#5403)
close the popup once the report has opened (#5341)

Tests

lantern: add lantern regression test scripts (#5435)
fix golden LHR (#5529)
smoke: remove console.timeline() call (#5560)

Misc

externs: import crdp from root node_modules (#5366)
golden-lhr: exclude audit descriptions (#5538)
scripts: more useful lantern debugging output (#5517)
viewer: load *.json if no *.lighthouse.report.json (#5343)
update codeowners file (#5564)
move metrics into dedicated metrics/ folder (9def0a6)
needs NPM as well as Node installed (114ebf5)
add links to lighthouse docs (c7304a7)

3.0.0-beta.0 (2018-05-24)

Full Changelog

Core

lantern: handle disk cache simulation (#5221)
network-recorder: handle QUIC requests (#5256)
tsc: add type checking to viewer (#5258)
tsc: add tsc type checking to report (#5195)

Deps

snyk: prettify snyk snapshot (#5080)

Docs

readme: add Garie to related projects (#5272)

Extension

expose URL shim (#5293)
another speculative fix for getCurrentTabURL; more logging (#5323)

Report

updates for devtools roll (#5326)
audit warnings are no longer top-level (#5270)
move runtime settings to footer (#5295)
avoid paint storms on scrolly header (#5207)
restore missing non-applicable icon (#5267)
animated chevrons (#5137)
DRY up audit & opportunity rendering (#5136)

Misc

github: add github PR and issue templates (#5163)
plots: extend default config (#5309)
scripts: add lantern evaluation scripts (#5257)
scripts: add trace/devtoolslog minification scripts (#5237)
viewer: fix saving as gist (#5251)
remove checkboxes from bug report template (#5330)

3.0.0-alpha.2 (2018-05-16)

Full Changelog

Core

lhr: audit id, title, description (#5190)
lhr: revert default wait bump (06205ef)
uses-preload: prevent infinite loop (#5184)
violation-audit: de-dupe items by URL and label (#5219)

Docs

readme: add lighthouse-lambda to related projects (#5227)

Report

dom-size: use correct learn more link (#5192)
header: fix stacking contexts within header (#5185)
minimum time scale for opportunities & filmstrip (#5183)

Tests

compile: fix broken compile-devtools script (#5234)
viewer: upgrade pptr to handle new CSSOM use in the report (#5191)

Misc

npmignore: include chrome launcher script (aa0e089)
viewer: switch to 2x viewer within the same tab (#5231)
viewer: support legacy 2.x reports in viewer (#5204)
closure cleanup in viewer from #5231 (#5235)
3.0.0-alpha.1 (c7c0044)

3.0.0-alpha (2018-05-09)

Full Changelog

New Audits

robots-txt: /robots.txt validation (#4845)
efficient-animated-content, use videos instead of gifs (#4885)
add preconnect audit (avoid costly origin roundtrips) (#4362)

CLI

chore: remove chrome-launcher stubs (#4945)
output: Add ability to export results to CSV (#4912)
update documented throttling flags (#5000)

Core

byte-efficiency: use lantern for opportunity estimates (#4601)
canonical-audit: allow multiple identical canonical links (#4973)
category: add manualDescription (#5100)
computed-artifact: remove requiredNumberOfArtifacts (#4764)
config: add support for audit/gatherer options (#4394)
config: remove config.artifacts; always use auditMode (#4986)
config: clean flags for config settings (#4960)
config: augment settings/passes with defaults (#4894)
config: switch to throttling settings object (#4879)
config: switch to lantern by default, add presets (#5041)
critical-request-chains: exclude preloaded requests from crc (#5011)
displayValue: fancier displayValue type (#5111)
domstats: useIsolation within domstats (#4811)
driver: add timeout to getRequestContent (#4718)
emulation: update Chrome userAgent to 66 (#4779)
estimated-input-latency: use a 5s rolling window (#4989)
fast-config: bring back a11y & SEO categories (#4932)
font-size: recalibrate the legible font sizes (#4550)
http-redirect: drop use of getSecurityState() to gain Android support (#4661)
image-usage: use min of resourceSize/transferSize (#4968)
img-usage: handle invalid images within determineNaturalSize (#4812)
is-crawlable: fix empty row in the details table (#4820)
is-crawlable: determine if page indexing is blocked by robots.txt (#4548)
is-on-https: consider about:* secure (#4749)
lantern: cleanup Simulator construction (#4910)
lantern: more flexible graph edge creation (#4933)
lantern: move metrics to computed artifacts (#4766)
lantern: improve RTT estimates (#4552)
lantern: use securityOrigin on record (#5071)
lantern: never exclude main document from graphs (#5124)
lantern: rename Simulation.Result.nodeTiming to be plural (#5038)
lhr: eliminate cards and list details (#4789)
lhr: convert reportCategories to categories object (#5155)
lhr: support printf displayValues (#5099)
lhr: rename perf-hint, perf-info, etc (#5102)
lhr: make reportCategories shallow; move audit scores to AuditResult (#4711)
lhr: support null scores (#5128)
lhr: s/initialUrl/requestedUrl, s/url/finalUrl (#5127)
lhr: s/audits/auditRefs, s/category.name/category.title/ (#5157)
lhr: strictly numeric scores, add scoreDisplayMode (#4690)
lhr: move runtime config to report => lhr.configSettings (#5122)
lhr: remove extendedInfo (#5160)
lhr: drop informative/manual, moving them to scoreDisplayMode (#5105)
lhr: overhaul LHR details, introduce details.summary (#4616)
lhr: remove debugString, add explantion/errorMessage (#5132)
lhr: s/fetchedAt/fetchTime (#5112)
lhr: lhr-lite type declaration (#4983)
lhr: overallSavingsMs, overallSavingsBytes (#5035)
load-fast-4-pwa: use computed artifacts (#4981)
main-resource: adjust main resource identification logic (#4475)
mainthreadwork: multiply by cpuSlowdownMultiplier (#5126)
metrics: consumable metrics audit output (#5101)
metrics: move TTCI to computed artifact (#4943)
metrics: switch to speedIndex from perceptualSpeedIndex (#4980)
metrics: add lantern speed index (#4695)
metrics: update lantern coefficients (#5120)
metrics: move first-interactive to first-cpu-idle (#4982)
metrics: rename ConsistentlyInteractive -> Interactive (#5068)
metrics: add lantern EIL (#5024)
metrics: add FCP metric (#4948)
metrics: add first CPU idle lantern metric (#4966)
metrics: move FMP to computed artifact (#4951)
network-analyzer: more distrustful of chrome connection info (#4828)
network-recorder: fix typo in once() call on super (#4926)
response-compression: also check x-original-content-encoding (#4607)
unify config and CLI settings (#4849)
network-requests: add resource type (#4743)
network-requests: add network requests audit (#4631)
noopener-audit: allow noreferrer as well (#4920)
opportunities: take max of savings on TTI, load (#5084)
preconnect: use lantern to compute savings (#5070)
preload: use lantern to compute savings (#5062)
redirects: use lantern to compute savings (#5081)
render-blocking: address followup feedback (#5039)
render-blocking: handle amp-style stylesheets (#4555)
runner: split lhr, artifacts return, respect output type (#4999)
runner: support multiple output modes (#5154)
runner: add custom folder support to -G/-A (#4792)
runner: rename generatedTime to fetchedAt (#4783)
scoring: tweak performance weights (#5083)
scoring: loosen metric thresholds (#5092)
scoring: tweak scoring thresholds based on HTTPArchive data (#5022)
screenshots: align filmstrip to observed metrics (#4965)
seo: link to "meta description" reference (#4566)
start_url: fix start_url audit while offline (#4710)
start-url: use window.location over fetch (#5159)
tsc: more type checking of top-level audits (#5089)
tsc: add type checking to dbw audits (#5069)
tsc: update for new @types/css-font-loading-module (#5061)
tsc: add type checking to Driver (#4827)
tsc: add type checking to gather-runner (#4944)
tsc: add type checking to asset-saver (#4949)
tsc: add types for DevtoolsLog and NetworkRecorder (#4918)
tsc: add type defs for Chrome Remote Debugging Protocol (#4816)
tsc: add type checking to remote protocol commands (#4914)
tsc: add type checking to fonts gatherer (#5018)
tsc: add type checking to use of CRDP events (#4886)
tsc: add type checking to dbw gatherers (#5005)
tsc: add type checking to most byte efficiency audits (#5072)
tsc: add type checking of first top-level audits (#5086)
tsc: fix OptimizedImages type; type check dep audits (#5129)
tsc: add type checking to seo gatherers (#4991)
tsc: add type checking to a11y and manual audits (#5055)
tsc: fix ImageUsage artifact type and gather bug (#5113)
tsc: add type checking to remaining top-level audits (#5090)
tsc: add type checking to computed artifacts (#5051)
tsc: add type checking to runner (#4961)
tsc: gather type-checking cleanup (#5019)
tsc: add type checking for seo audits (#5103)
add type checking to audit and gatherer base classes (#4762)
tsc: add type checking to many core gatherers (#4975)
convert diagnostics to numeric scores (#4778)
remove cache-start-url audit (#4760)
audit.details features numbers, not strings. introduce itemKey (#4384)
add default audit options for scores (#4927)
look up custom gatherer relative to the config file path (#4751)
add type checking to connection (#4738)
make url-shim extend native URL module; add type checking (#4712)
merge render blocking audits to lantern (#4995)
bump version to 3.0 alpha (#5082)
de-dupe URLs in is-on-http, uses-http2 (#4950)
rename uses-request-compression (#4763)
tti: update ignorable network requests and use FCP (#5021)
webapp-install: simplify start_url warning when no SW is found (#5067)

Deps

axe-core: update axe-core to 3.0.0-beta.2 release (#4595)
browserify: update deep transitive dep to use recent acorn (#4813)
browserify: bump browserify for async/await (#4767)
extension: bump browserify version and sub-deps (#5076)
robots-parser: patch robots-parser to work in browser env (#4819)
snyk: update snyk snapshot (#5074)
speedline: use speedline's types instead of our own (#5078)

Docs

contributing: fix link for closure annotations (#4680)
headless-chrome: switch to prioritize headless (#4553)
headless-chrome.md: fix broken link (#4523)
programmatic: add caveat about removing artifacts (#4540)
readme: remove ts command for lighthouse-cli dev (#5088)
readme: Bye Bye Greta (#5036)
releasing: updates (fcec593)
update docker image id (f092a8a)
remove dated domhtml reference from README (#4900)
"LHR" is "Lighthouse Result" (8861386)
add html report overview writeup (#5059)
report: minor fix of markdown link (#5063)
understanding-results: description can dynamically be the failureDescription (cc53688)

Extension

compilation: add object rest support (#4954)
tests: add extension pptr smoketest (#4640)
add checkbox for using Lantern/DevTools throttling (#5156)
pass flags through to config (#4936)
use browserify url library (#4875)
polish the status updates within the popup (#4780)
fix issue where gatheres cannot be found (#4592)

Report

bootup-time: fix learn more link (#4962)
score gauges, metrics display, add rich tooltips (#5009)
category: enable all categories to show audit groups, refactor CategoryRenderer (#4278)
final metrics display, icons, whitespace polish (#5130)
improved text-wrapping (#5138)
new audit list display, indexes & new icons (#5109)
error'd audits get 'Error!' treatment (#5077)
add docs link to bootup-time audit (#4537)
tweak tooltips (2993522)
add auditIds to DOM. update pptr tests to assert against them (#5058)
rework the DOM of audits (#5045)
only appendScoreScale to scoreHeader if it exists (#5040)
move html report from v2/ dir to html/ (#5034)
audit details not longer collapsible. fixup width and margin (#5151)
update link to rel=canonical reference (#4701)
implement new design for opportunities (#5115)
fix audit description typos (#4882)
update SEO audit descriptions & links (#4903)
add jsdoc for lhr.artifacts (#4859)
new header branding (#5125)
description: update helpText for document.title audit (#4677)
font-size, link-text: update docs links (#4829)
is-crawlable: fix broken learn more link (#4844)
scores: make sure scores are represented out of 100 (#4750)
seo: update link to the is-crawlable/indexing reference (#4678)
table: handle null cells (#5075)
util: fix formatDuration, add tests (#5023)

Tests

appeveyor: exclude perf smoketest until flake is fixed. (#5060)
exclude audit helpText from 'yarn diff:sample-json' assertion (#4964)
closure: avoid failing closure compilation (#4737)
closure: fix BSD sed calls within compile-devtools (#4736)
config: add merge-options test (#4747)
extension: add reminder about building the extension (#4902)
fixtures: introduce update-report-fixtures script (#4793)
smoke: add smoke test code coverage (#4967)
fix run-smoke handoff of testResults (#4959)
smokehouse: increase timeout (#4990)
smokehouse: split pwa2, perf batches (#4988)
smokehouse: adjust byte efficiency CPU multiplier (#4809)
smokehouse: retry failed tests (#5143)
smokehouse: run smoketests in parallel (#4748)
rename seo test files (#4853)
bump bundlesize threshold (#5050)
use nyc instead of istanbul for coverage (#4919)
node 10 compat (#5106)
disable compile-devtools on travis (48792ae)
add CI test to confirm sample_v2.json is up to date (#4956)
split up parallel smoketests into 2 batches (#4996)
drop port number from dbw_tester for golden lhr (#5006)
remove unused fixtures (#5107)
fix cli handling empty runnerResult during gatherMode (#5052)
viewer: add pptr test for viewer (#5025)

Misc

codeowners: revert brendan's leave (#4716)
eslint: add no-floating-decimal (leading zero) rule (#4893)
eslint: update to es2017 to allow async/await (#4791)
tsc: reorganize and expose external interfaces (#4788)
typecheck: add dependency graph to tsc (#4605)
remove timing from golden lhr (#5020)
clean *.screenshots.json (#4754)
drop support of Node 6 (#4703)
minor whitespace fix on unminified-css audit (16da670)

2.9.1 (2018-02-12)

Full Changelog

New Contributors!

Thanks to @GaryJones for helping us spel gud!

Core

REVERT: gather-runner: load a blank data URI, rather than about:blank (#4518)
fonts: fix infinite loop (#4488)
responsive-images: move images with no dimensions to offscreen audit (#4487)
tracing-processor: fix scheduleable task logic (#4480)
webfonts: patch fonts gatherer to handle missing font item (#4465)
computed-artifact: use deep equality over strict (#4409)

Docs & Tests

docs: examples of combining puppeteer & lighthouse (#4408)
appveyor: quietly unzip Chrome to keep appveyor logs cleaner (ecedb32)
appveyor: only run tests against master and PRs (#4484)
smokehouse: improve smokehouse failure output (#4482)
spelling: fix discernable to discernible (#4485)

2.9.0 (2018-02-08)

Full Changelog

New Contributors!

Thanks to @FadySamirSadek, @christhompson and @rupesh1 for their first contributions! Awesome stuff.

New Audits

mixed-content https upgradeability (#3953)
preload: Adding <link rel=preload> audit (#3450)
font-display: Recommend font-display: optional (#3831)

CLI

Add --extra-headers: Enable sending additional HTTP Headers (#3732)
Add --mixed-content: triggers the mixed content audit (#4441)

Core

centralize error strings (#4280)
gather-runner: load a branded data URI, rather than about:blank (#4310)
mobile-friendly: convey MFT covers add'l mobile-friendly auditing (#4307)
response-compression: Exclude binary files from auditing (#4144)
screenshot-thumbnails: increase size to 120px (#4383)
start-url: switch to plain old fetch (#4301)
unminified-js: add tolerant option to esprima (#4338)
a11y: aXe perf: only collect provided resultTypes (#4380)

Deps

bump metaviewport-parser to 0.2.0 (#4382)
snyk: update snyk snapshot (#4439)

Misc

coverage: minimize impact of timeout due to istanbul's instrumentation (#4396)
escape usage of '#' in data URIs (#4381)
package: scripts don't require "--" for options to be forwarded (#4437)
sentry: update sampled errors list (#4277)
travis: Only build on Node 6 for PRs. Don't do the push build for non-master. (af8dbd0)
Extension: Fix scrollbar from showing on Options page (#4263)

2.8.0 (2018-01-12)

Full Changelog

New Contributors!

Thanks to @jianzhoufeng and @nhodges for their first contributions!

New Audits

avoid plugins (#4218)
rel canonical: document has a valid rel=canonical (#4163)
unminified-css: identifies savings from unminified CSS (#4127)
unminified-javascript: detect savings from minifcation (#3950)
manual SEO audits (structured data & mobile friendly) (#4108)

Core

lifecycle: allow gathering & auditing to run separately (#3743)
gather-runner: covert assertPageLoaded into soft failure (#4048)
network-recorder: use findNetworkQuietPeriods for networkIdle (#4102)
report-generator: extract scoring into separate module (#4161)
screenshots: fix getParsedImage of null (#4189)
trace-of-tab: error when TracingStartedInPage is missing (#4164)
errors-in-console: If exception info is not present use exception text (#4191)
estimated-input-latency: remove target reference (#4069)
bootup-time: Add 10ms threshold to bootup-time audits (#4223)
font-size: make font size artifact serializable (#4194)

Report

a11y: Don't count non-applicable a11y audits toward score (#4052)
more attractive table/URL rendering (#4190)
improve devtools dark mode rendering (#4232)
categories: performance first, then pwa, then the others (#4095)
grammar: do not finalize audit titles with a period (c5f6d05)
change 'app' => 'web app' (29eecce)
Update vulnerability links (#4198)

Deps

bump js-library-detector (#4086)
chrome-launcher: Upgrade chrome-launcher to 0.10.2 (#4192)

Docs

readme: update CLI options, output examples. add GAR/Lifecycle examples (#4185)
readme: demo flags in example of programmatic use (#3841)
lantern: update accuracy data (#4180)
extract Release Guide into own docs file (#4200)
releasing: document the LH Release Process (#4201)
results: describe audit's notApplicable/error (#4186)

Extension

extract a new ext-bg file, splitting extn/devtools usecases (#4162)

Tests

remove global timeout, set timeouts individually (#4224)
trace-parser: use fs over require (#4209)
travis: force use of GCE, remove dSE calls (#4222)
travis: remove upload artifacts (#4219)
travis: test on Node 9, drop testing on Node 7 (#4181)

Misc

remove CLI's legacy domhtml output (#4176)
viewer: retain /plots/ when deploying new viewer version (#4079)

2.7.0 (2017-12-14)

Full Changelog

New Contributors!

Thanks to @sanjsanj, @dennismartensson, @daannijkamp, @crimeminister!

New Audits

accessibility: add accessibility manual audits (#3834)
font-size: legible font sizes audit (#3533)
hreflang: document has a valid hreflang code (#3815)

CLI

compile out remaining typescript; add tsc type checking via jsdocs (#3747)
sentry: handle configstore errors; don't enabling error reporting (#3878)

Core

config: show SEO audits in the UI (#4057)
critical-request-chains: corrected help text (#4009)
devtools-timeline-model: extract model generation to a computed artifact... (46f6d2a)
driver: add driver.wsEndpoint() (#3864)
gather-runner: fix headless chrome UA check (#4019)
noopener-audit: Only test http/https links (#4036)
optimized-images: skip mismatched mimeTypes (#4045)
seo: consistent help text links (#3901)
uses-webp: tweak text to be more next-gen focused (#3985)
vulnerable-libs: add fix for recovering from bad versions (#3932)
web-inspector: keep all experiments disabled, fixing conflict when running in DevTools (#4010)

Deps

Bump ws to 3.3.2 (#3949)

Docs

error-reporting: improve clarity for opt-out folks (#3876)
add lantern accuracy data (#3826)
fox mobile device testing example (#3887)
readme: Add Greta Lighthouse to list of Integrations (#4031)

Report

perf-audits: adjust presentation of runtime cost audits (#4020)
warnings: warn only if using an old headless (#4021)

Tests

smokehouse: adopt URLSearchParams for querystring manipulation (#3941)

Misc

changelog: tweaks to changelog template and instructions (#3849)
changelog: minor changelog generation usability bumps (#3847)
codeowners: represent brendan's leave (#3991)
error-reporting: report unhandled promise rejections, take 2 (#3930)
error-reporting: tweak sentry levels and ignore list (#3890)
error-reporting: report unhandled promise rejections (#3886)
Update wording (6036117)

2.6.0 (2017-11-18)

Full Changelog

New Contributors!

@peterjanes, @stevector, @AkshayIyer12, @manekinekko, @alekseykulikov, @coliff, @emazzotta

New Audits

redirects: avoid page redirects (#3308)
link-text: descriptive anchor text audit (#3490)
is-crawlable: page is blocked from indexing (#3657)
bootup-time: JS bootup time per script (#3563)
uses-long-cache-ttl: detects savings from leveraging caching (#3531)
mainthread-work-breakdown: audit for page-execution timings (#3520)

CLI

do not double quote chromeFlags (#3775)

Core

aspect-ratio: skip aspect ratio audit for svg (#3722)
audit: Ignore href=javascript:.* for rel=noopener audit (#3574)
bootup-time: refactor task/group iteration (33b1574)
config: add silent seo audits to default config (#3582)
config: re-weight a11y scores based on severity and frequency (#3515)
config: add category weight to perf config (#3529)
critical-request-chains: Remove iframe as Critical Request (#3583)
dependency-graph: add acyclic check (#3592)
devtools-model: fix missing Runtime.experiments object (#3514)
driver: increase default timeout to 45s (#3741)
driver: use execution context isolation when necessary (#3500)
emulation: remove use of deprecated Emulation.setVisibleSize (#3536)
errors-in-console: include runtime exceptions (#3494)
image-aspect-ratio: pass audit when no images are missized (#3552)
image-usage: add null check for parentElement (#3779)
add error reporting (CLI only) (#2420)
meta tag gatherers: meta tag search should be case-insensitive (#3729)
predictive-perf: predict FCP (#3730)
predictive-perf: refactor simulation logic (#3489)
response-compression: add transferSize sanity check (#3606)
record top-level warnings in LHR and display in report (#3692)
remove useless optimalValue (#3774)
speed-index: only compute perceptual speed index (#3845)
tags blocking first-paint: exclude script type=module (#3676)

Docs

changelog-generator: Generate changelogs (#3632)
scoring: create documentation on scoring (#3436)
bug-labels.md: Create bug-labels.md (#3522, #3525, #3535)
contributing: pr title guidelines (#3590)
correct capitalization of GitHub (#3669)
add results object explainer (#3495)
new-audits.md: Principles and guidance for new audits (#3617)
readme: add MagicLight WebBLE integration (#3613)
readme: add Treo to the list of integrations (#3484)
throttling: because comcast throttles the websocket (bedb9a1)

Report

Add print summary and print expanded options (#3578)
image-aspect-ratio: fix audit description (#3843)
redirects: reformat results, incl all requests and wasted time, (#3492)
render-blocking-stylesheets: improve actionability of helpText (#3544)

Tests

update eslint (and goog config) to latest (#3396)
eslint: use --quiet flag rather than --silent (#3491)
smokehouse: add long task to byte-efficiency tester to deflake appveyor (#3804)
smokehouse: disable multiple shadow root deprecation test (#3695)
smokehouse: Passive event listener violation doesn't report on passive:false now (#3498)
web-inspector: add test for setImmediate polyfill (#3670)

Misc

codereview: add CODEOWNERS file (#3591)
Bump chrome-launcher to 0.8.1 (#3479)
web-inspector: fall back to page's Runtime and queryParam() (#3497)
use undated Apache 2 LICENSE file (#3700)
audits: removed unused audit meta.category (#3554)
changelog: add commitlint config (for commitlintbot) (21e25aa)
commitizen: new-audit => new_audit (#3534)
jsconfig: Enable type checking for JavaScript (#3589)
logos: provide svg logo as png (8b3d7f0)
Fix minor grammatical error (#3638)
add cz-customizable to establish a commit message convention (#3499)
typo: fix typo in image-aspect-ratio audit (#3513)

2.5.1 (2017-10-06)

Full Changelog

Fix compat with DevTools via Runtime mock object

2.5.0 (2017-10-04)

Full Changelog

New Contributors!

Huge contributions from new contributors with all-new audits, Chrome launching improvements, and more complete documentation. Thanks to @mikecardwell, @rviscomi, @siddharthkp, @ThisIzKp, @rootulp, @kdzwinel, @LCartwright, @siteriaitaliana, @vinamratasingal, @alanyin0322, and @tkadlec!

New audits

image-aspect-ratio best practice audit (#3084)
time-to-first-byte perf audit (last fixes and now enabled) (#2231)
errors-in-console best practice audit (#2836)
no-vulnerable-libraries best practice audit (#2372)

New audits in full-config

unused-javascript coverage audit (#3085)

New audits in new SEO config (#2999)

meta-description SEO audit (#3227)
http-status-code SEO audit (#3311)

FastMode

add predictive-perf shell and base audit (#2720, #3189)
add network estimation (#3187, cf5638d6)
add CPU estimation (#3162, 18837dad, 5b459a1e)

Core

update unused-css-rules audit to support new coverage format (full-config only) (#2518)
perf: use Audits.getEncodedResponse in optimized-images audit (#3087)
don't wait for Page.navigate to resolve to listen for page load (#3413)
include v8.execute trace event category (ab6aabde)

Report

clarify wording of category descriptions (#3000)
add a linked-text type to details renderer (#3165)
fix: tame greedy markdown-link regex (#3312)
fix: prevent \u2028 and \u2029 from breaking the report (#3442)
improve descriptions for a11y audits (#3474)

Testing

smokehouse: adjust unused-css-rules audit expectations (#3036)
bundlesize: fix reporting in github UI (ede05c0a, #3392)
smokehouse: add basic smoke test for SEO audits (#3267)
travis: unset \_JAVA_OPTIONS for DevTools' compile_frontend.py test (#3354)
eslint: enable comma-dangle rule, fix all new errors (#3324)
smokehouse: add time-to-first-byte smoke test (#3310)

Docs

import audit glossary from SEO doc (#3207)
add advanced throttling guide (#3205)
readme: reduce minimum Chrome version to current stable (#3287, 5382f37c)
readme: add explanation for Lighthouse Integrations section (#3418) contributing.md: fix grammatical errors (#3419)

CLI

add blockedUrlPatterns support to CLI (#3125)
adopt yargsParser directly for chromeFlags parsing (#3408)

Chrome-launcher

chrome-launcher has moved to a standalone npm package

docs: add changelog (#2987)
improve SIGINT handling (#2959)
mute audio (#3028)
rev to 0.6.0 (ec38bcd9, 970d3cad, e9d569c5, 5e9a3aba)
handle errors inside spawnPromise (#2939)
switch to using standalone package (#3410)

Misc

apply small license header to remaining files (#3309)
fix: remove redundant lighthouse-logger/ from npm package (#3411)
remove old perfX code (#3431)
update plots-config to use newer quiet parameters (#3464)
collect even malformed error messages in extension (#3473)

Deps

upgrade bundlesize to 0.13.2 (#3122)
upgrade axe-core to 2.4.1 (#3284, #3320)
upgrade ws to 1.1.2 (2d2206b8)
add yargs-parser at 7.0.0 (#3477, #3478)

2.4.0 (2017-08-14)

Full Changelog

Core

Refactor error throwing from assertPageLoaded (#2785) (07817f9)
refactor: cleanup unused waitFor properties (#2716) (9d8a32f)
All audits must specify helpText and failureDescription (#2737) (db3f324)
"shrink-to-fit" property in "viewport" meta is no longer invalid (#2863) (e1a04dd)
driver: add compat comment on PerfObserver GC bug (d7ffec1)
emulation comment: can remove injectedTouchEventsFunction in October (#2889) (a6b71c9)
Ignoring other extension assets in request compression audit (#2733) (428f637)
fix(anchors-with-no-rel): ignore same origin links (#2749) (78ec647)
add flag to FMP to indicate if it fell back to FMP candidate (#2851) (46d9ba7)
fix(script-blocking-first-paint): ignore latent resources (#2721) (ac99084)
Include version and commit in lighthouse-background.js bundle (#2236) (7fe3574)

Report

link all a11y audits to 2.2 aXe docs (#2709) (924e1f1)
Update consistently-interactive.js helpText (#2740) (6f7bf29)
Update first-interactive.js helpText (#2739) (a829811)
Report: add lighthouse query param to axe helpText links (#2767) (4b9cbb5)
Report: Close export dropdown when printing (#2914) (a45ece8), closes #2914
report: draw metric lines over the screenshots. (#2848) (5832761)
fix(report): proper arrow state and consistent capitalization (#2750) (7c461bf)

Testing

testing: prune smokehouse configs to improve testing perf (#2732) (e72483b)

CLI

Fix: Basic chrome-flags parsing for embedded quotes (#2754) (78a8bd7)
Add hostname CLI flag and option for CriConnection (#2728) (0455283), closes GoogleChrome/lighthouse#2727

Chrome launcher

launcher: clarify priority of chromePath options (494f991)
chrome-launcher: add support for finding Chromium on Linux (#2950) (1c11021)
launcher: support enabling extension loading (#2650) (c942d17)
[chrome-launcher] Publish type definitions instead of source TypeScript files (#2898) (391e204)

Misc

Lowercase fix for "service worker" (#2729) (15068bd), closes #2729
open extension's report in new window. (fix for incognito) (#2734) (934aa42), closes #2734
pass --enable-extensions on from manual-chrome-launcher (#2735) (37fd38c)
Update lighthouse-logger location in readme (#2867) (1347b15)
readme: added CHROME_PATH description from CLI help (#2757) (af003d4)
readme: update example using deprecated LIGHTHOUSE_CHROMIUM_PATH (#2929) (de408ad)
docs: Add a changelog.md (#2986) (626ce68)
Viewer: log expected URL (#2724) (6478f15)
Fix eslint max length in github-api.js (#2730) (1ca40de), closes #2730
add license file to launcher package. (#2849) (8bc6d18)
Add license to lighthouse-logger. (#2846) (367ea7a)
Clarification of hasOfflineStartUrl rule (#2775) (7097d5c)
gulpfile. add commented out lines for sourcemap generation. (6f53ab9)

2.3.0 (2017-07-20)

Full Changelog

test: fix clang-format error (#2691) (fedc76a), closes #2691
test(format-helpers): TZ independent check (#2653) (56e8f9b)
add bundlesize to track our build size (#2676) (5172ff7)
Add failureDescription to audit. display on fail (#2478) (b0df777)
Added CHROME_PATH to readme (#2694) (5728695)
bump extension to 2.2.1 (e5f3a7b)
Expose LHR to modules consuming cli/run.ts (#2654) (9c0c078)
Fix chrome finder on linux/osx when process.env isn't populated (#2687) (112c2c7), closes #2687
fix launcher w/ arbitrary flags (#2670) (8c9724e), closes #2670
Gather-runner: Get useragent before emulating (#2715) (f8c1dc1)
launcher to 0.3.1 (2004363)
launcher to 0.3.2 (fc48c8a)
remove duplicate url check in core/index.js (#2658) (425b5fb)
track number of completed requests in total-byte-weight extendedInfo (#2697) (eecf525)
tweak codecov config. (e9d5a0f)
update "page load fast enough on 3G" helpText (1d0d4ff)
Update the helpText in uses-webp-images.js (#2681) (b93ca14)
update uses-optimized-images.js helpText (#2669) (5b41ebc)
update webapp-install-banner.js helpText (#2622) (a2e4e1e)
upgrade rimraf to latest (#2641) (ef08106)
v2.3.0 (232c99b)
perf(uses-http2): check protocol first (#2701) (bbe2191)
feat: add base fast mode config (#2702) (5d61056)
feat(computed-artifact): support arbitrarily many inputs (#2705) (4143aac)
refactor: extract computeLogNormalScore method (#2710) (648cce6)
refactor(StartUrl): switch from error to debugString object (#2549) (64b015e)
docs(config): add explanations for gatherers property (#2704) (76cdb54)
docs(readme): link to config docs from readme (98d85cc)
Report: improvements w/ new density... (#2706) (97c7170)
Report: Updated styles (#2297) (a9867d5)
fix(config): keep defaultPass on rebuild (#2671) (78e761a)
fix(domstats): enable DOM domain (#2640) (3ee5215)
fix(driver): prevent PerfObserver from being garbage collected (#2682) (36c2df5)
launcher: log the specific chrome spawn command. (3f143b1)
launcher: nuke 'as string' (a6bbcab)
launcher: support custom port via chrome-debug binary (#2644) (6df6b0e)
cli: remove --select-chrome,--skip-autolaunch. Support CHROME_PATH env (#2659) (41df647)
connection: log the protocol error data field (#2645) (d587357)
plots: dashboard - identify variance over lighthouse versions (#2520) (9561330)

2.2.1 (2017-06-30)

v2.2.1 (187c6d5)
fix(extension): Restore status logging to extension (#2629) (fe99052)

2.2.0 (2017-06-30)

Full Changelog

`chrome-launcher` shipped as a standalone module

The chrome-launcher module is now on npm. Great for working with Chrome headless.

Lighthouse viewer updated for Lighthouse 2.0

The Lighthouse Report Viewer can now view data from Lighthouse 2.x, including JSON saved from the CLI, exported from the Chrome extension or DevTools Audits panel. (#2521)

New contributors

Thanks to Katie Hempenius, Artur M, Kevin Farrugia, Piper Chester, Robin Drexler, and Mike Deverell. Due to the effort of these developers we now have an audit for checking for paste-blocked password fields, unified usage of toLocaleString(), a correct gulp recipe, a well-functioning chrome-launcher module, and improved clarity in the audit test descriptions. We truly appreciate all these improvements!

Since 2.1.0 we've had a number of other features, fixes, and improvements. Presented by category:

Report

use locale string for all our number output (#2553)
fixes viewer CSS specificity and event listener removal (#2575)
freshen up audit helpText
Report: don't display score gauge header if there's only one. (#2261)
Remove report v1 and dependencies (#2596)
better debug message for missing network times (#2451)
spelling fix in link-name audit (#2496)
Theme Color wording fixes (#2466)

Audit + Gather

fix(driver): wait for CPU idle via clientside perfObserver (#2473)
Remove /deep/ usage as it is being deprecated (#2371)
Remove BOM encoding from manifest (#2175)
Throw better error message when url is not auditable (#2527)
Critical Request Chain audit: fix incorrect transfersize. (#2610)
domstats: prevent infinite loop (#2561)

Performance & Traces

docs: add trace interpretation guide (#2472)
use a stable sort for trace events (#2415)
remove old TTI code (#2452)
refactor(trace-of-tab): return timestamps in microseconds (#2454)
add streaming json parser
add streaming trace writer in saveAssets

Plots

better support power use cases (#2464)
disable flaky smoke test (#2606)
smoke test for happy case (#2411)

Configurability

feat(config): add audit skipping support (#2499)
feat(config): add extends lighthouse:full (#2557)
docs(config): add config documentation (#2592)

Misc

Add script to capture travis build durations (#2541)
Expose launch/lighthouse/report flow to consuming modules (#2602)
harden security of static-server (#2563)
is-on-https: check record.protocol for blob urls (#2538)
LH implementation of LogNormalDistribution; remove traceviewer (#2456)
move computed artifacts dependent on networkRecords to devtoolsLog (#2467)
Enable typescript coverage metrics for coveralls.

2.1.0 (2017-06-07)

Full Changelog

Fixed bugs:

Friendlier message for multiple tabs to same origin #2299
de-jsonify default.js #2445
Compact the license headers #2444
update smokehouse PWA expectations #2443
Disable the dismissJavaScriptDialogs smoketest. #2437
Large DOM size increases memory usage, not memory fix wording #2433 (khempenius)
Fix US-centric wording #2432 (khempenius)
add units to LoadFastEnough debug string #2427
remove aggregations #2426
link to "offscreen images" reference #2417 (kaycebasques)
readme: add notes on per runs #2410
Updated readme to add port number when testing a site with authentication #2409 (mikerhyssmith)
Update optimized-images overview jsdoc #2408
fix(report): footer height on small viewports #2400
rmtraceviewer branch: reduce -> for..of #2399
feat: tooltips for all formatted URLs #2398
travis: include node 8.0.0 #2395
fixed incorrect comments #2392 (mixed)
Appveyor fixes: fresh yarn, only node6 build #2382
Run npm install/build tasks in parallel #2381
Re-enable AppVeyor support. #2380 (XhmikosR)
Fix icons on firefox by decoding svg imgs #2378 (ev1stensberg)
revise package.json script to the correct folder #2373 (ev1stensberg)
update help text for a11y audits #2370 (kaycebasques)
fix: deprecate old HTML report #2367
add audit to check if paste is allowed in password inputs #2366 (robin-drexler)
swap math.round with util.formatNumber #2361 (ev1stensberg)
😈 Fix disconnect promise race. #2359 (samccone)
Enable passing of a custom userDataDir to launcher #2357 (samccone)
test(smokehouse): add numeric comparisons #2356
✨ Add Calibre and WPT to Readme #2355 (benschwarz)
fix: bump jpeg quality #2354
fix: hide violations with no URL information #2352
fix(connection): gracefully handle missing method #2351
fix: normalize all times to navStart, remove traceviewer model #2347
extension: Fix formatting of bug reports #2343
Docs: update readme, add docs/readme, modernize a bit #2341
Total byte audit reports full URL #2312 (johnboxall)
polish: show audits with debug string, don't fail loadfast4pwa on network latencies, works-offline change #2294
fix: always ensure tracing is off before starting #2279
polish: listen for network idle after DCL #2271
Switch to containerized Trusty #2234 (stramel)
Plots: make measure script more flexible CLI args #2183 (wwwillchen)

2.0.0 (2017-05-19)

Full Changelog

Big changes

Brand new report

Everything is brand new UI. header footer, left nav, export, score gauges… screenshots! filmstrip . pass and failures seperated. Sparklines. Accessibility by section. Perf sections..

Chrome DevTools Integration

Take a look at the DevTools' Audit tab, where Lighthouse is now integrated

Lighthouse is much faster now

Overall the Operation Yaquina Bay (Issue #2146) effort made massive improvements to the total lighthouse runtime:

476e7806 fix: remove afterPass throttling (#1901)
7d7bac66 perf: enable speedline fastMode (#2230)
f7ea9354 perf(config): disable styles gatherer (#2153)
d99778b4 perf: consolidate DBW pass into defaultPass (#2160)
ff21a33a fix: only record a trace if needed by an audit (#2117)
740c2e99 perf(gather-runner): Clear cache selectively per-pass (#2156)
4c515cfa block stylesheets and images on redirect pass (#2168)
d0cb646a perf(gatherers): skip optimization of cross origin images (#2154)
d99b5ada perf: make network quiet threshold configurable per pass (#2220)

New Contributors!

Huge thanks to who contributed 27 epic PRs.

@abacon - remove images from critical request chains
@benschwarz - Calibre and WPT to readme
@chrisdwheatley - add related projects section
@dandv - Mention where the documentation is
@dgozman - Add basic rendering to report generator v2
@ev1stensberg - math.round scores, firefox svg images, package.json correct folder
@jinjorge - Fix typo in readme
@jimthedev - readme instructions for running behind a login
@johnboxall - Total byte audit reports full URL
@mrbusche - Update outdated link for "Web App Install Banners" article
@maya - Fix "Installation" spelling mistake
@stramel - non-critical images, template literal linting, containerized trusty
@mikerhyssmith - Updated readme to add port number when testing a site with authentication
@sendilkumarn - handlebars precompiled (we'll pour one out), clearer iconography, helpText fixes.
@ZZhaoTireless - report <details> printing fix
@cedricbellet - handleJavascriptDialogs
@thearegee - Readme: Adding lighthouse-cron to Related Projects

Audits

Added the "is fast on 3g" audit
4c34e28f Fix service worker gatherer by waiting for active state (#1864)
bbe7f3b9 allow computed artifacts to request other computed artifacts (#2018)
ba01e2a2 Added audit for request compression (gzip & br) (#1513)
ef520256 feat(image-usage): add support for CSS images (#1868)
17088655 fix: default(.json -> .js). Disable css usage audit (#1911)
50349613 Collapse the 9 manifest PWA audits into 3 (#1847)
902585b8 feat: add OffscreenImages Audit (#1807)
bad5bdae Add TTI < 10s audit for PWA (#1840)
d2cb5a21 feat: add consistently interactive audit (#2023)
d3a06925 DOMStat Audit: shadow roots don't have .classList (#2131)
691157f2 Add audit to check if start_url is cached by SW (#2040)
df2fae5e PWA Audits: add placeholders for rest of baseline checks. (#2248)
3c752a0c refactor: split optimized images into WebP and optimize audit (#2216)
c908e817 retire TTI (alpha) audit (#2266)

Metrics & Precision

ade2d88f Enable CPU throttling (4.5x) (#1778)
added the TTFI and TTCI metrics
f1aeb581 Fix screenshot capture bounds (#1839)
7b86c71e Enhance error wording around busy traces. (#2247)
008c5d91 add lighthouse execution time to json results (#2241)
f0e0dfaf tests: exclude score checking and flaky link preload assertion. (#2202)
bd7f862d Update: Use array of non-critical resource types (#2191)
0549cca7 fix: always use navStart as speedline timeOrigin (#2114)
da8e0979 NEW feat: add firstInteractive (#2013)
2212ca2e Update network throttling to simulate more realistic network conditions (#2238)
b5bf067b Remove images from critical request chains. (#2085)
0bf1744b fix: add more helpful error messages when fMP is missing (#1959)
ca2600ac Improve reliability of finding navStart (#1895)
04579fe3 Ignore cache hits for "fast on 3g" check (#2143)
b1784d12 Ignore memory cache hits too. ref #2143
e84530e7 fix: bump jpeg quality for image optimization audit (#2354)
0d0e93f3 fix: do not flag blob urls as insecure (#2330)
782acc59 polish: do not fail loadfast4pwa for internal redirects (#2296)

Plots

b2eaa086 Plots: A/B screenshot viewer (#2026)
618d5f0a plots: metrics-per-site view (#2041)
c43eb098 plots: measure and visualize perf metrics (#1936)
3f7e5a1c Plots: make measure script more flexible (CLI args) (#2183)

CLI

Chrome launcher is a thing now.
2bb9c5b3 readme: tell developer to have yarn installed. ref #2072
65bec1bd feat(cli): add support for custom trace categories (#1866)
b9bce62b Warn users if they have not yet generated the file. (#2176)

Testing

47ee1b8d travis: include node 8.0.0 (#2395)
Re-enable AppVeyor support #2380, #2382
d5854b64 test(smokehouse): add numeric comparisons (#2356)
8b47006e Smokehouse: log out the node command we spawn (#2074)
4f598c50 ci: save perf trace to S3 on failure (#2051)
5945332c Switch to containerized Trusty (#2234)
fb791e40 update eslint curly rule to google js style (#2263)

Misc

07e0aab1 Remove recordNetwork from config (#2102)
16b0b048 feat: support Config running only specified categories or audits (#1988)
b2ccdfcb Allow opn & update-notifier CLI deps to be optional. (#2150)
283af871 dismiss any Javascript Dialogs automatically (#1939) (#2106)
e475bdb5 refactor(aggregations): switch usage of aggregations to categories (#1935)
48b72a85 fix: always ensure tracing is off before starting (#2279)
131df278 polish: listen for network idle after DCL (#2271)
d7e4d1bb always construct networkRecords from devtoolsLog (#2133)
11a1db3c networkRecords => computed artifact. generate networkRecords during gather via the networkRecorder dispatcher breaking change: performanceLog => devtoolsLogs
fb3cfbd5 makes non-finished network records available (#2197)
d7064290 extension: Fix formatting of bug reports (#2343)
9f5a8aa9 Add error to chrome extension when url is using the chrome protocol (#2346)

Docs

Many readme/contributing changes, related projects
e46f5401 Architecture docs: add arch diagram and lingo updates (#2158)
af479e9f Architecture diagram
8047ef36 Add custom audit recipe (#2255)
6898d09e add CI gulp recipe (#1886)
909a4638 add doc for testing site with authentication (#1906)
7c1c1c59 improve instructions for running behind a login (#2123)
fb86d507 Docs: add docs/readme (#2341)
d926f321 README: update CLI help with latest. Give common examples (#2182)
15c5ef13 add related projects section (#1835)

Deps

e46244d6 Bump axe-core (#2090)
638760ee Migrate all dev scripts + docs from npm to yarn. (#2071, #2072, #2067)
d90bce3b fix: bump speedline to fix perceptual speed index (#2046)
3716658b Rev axe to address #2206 (#2335)

1.6.5 (2017-03-04)

Full Changelog

This is a maintenance release on the stable 1.6 branch.

Master branch (tagged at 2.0.0-alpha) is under some heavy refactors, so we're holding off on shipping a new version. Expect one by mid-May. ( Poke around recent PRs and issues if you're curious what we're up to ;)

In the meantime, only a few changes here in 1.6.5:

Audits

Improve HTTPS audit by using network records rather than Security domain, which is broken on Android.(original pr #1918) (#2054)
Disable unused css rules audit for now, as we want to revisit correctness later (#1912)

Report

Add legend to decipher iconography left to us by the ancient ones (#1841)
Print doesn't cut off expanded audit details (#1870)
Biggin icons for a11y (#1856)
Tweak report colors so that we are WCAG2AA valid.

CLI

support multiple output modes (#1813)
add update-notifier. (#1890)

Testing

smokehouse: fix flakiness of dom-size expectation (#1881)
include a normal CLI run in the travis build.

Misc

remove npm prepublish (#1889)

Thanks to @ebidel and @paulirish for merging this stuff back to stable branch.

1.6.0 (2017-03-04)

Full Changelog

There were 44 PRs landed for this release. These are their stories.

New Contributors!

Huge thanks to @sendilkumarn, who contributed four epic PRs. Also welcome to @tommycli, @narendrashetty, @mohsen1 and @dentemple. Readme tweaks are how it all starts. ;)

Notable Changes

WebPageTest integration is in beta

By popular demand, you will soon have a way to run Lighthouse on demand in the cloud. We've worked closely with WebPageTest to enable Lighthouse auditing and analysis from within a WPT run. Our contribution WPO-Foundation/webpagetest#825 was just merged and Lighthouse on WPT is currently in private beta.

lighthouse-webpagetest-beta

Lighthouse's CLI output has taken a chill pill - #1764

While you can view all Lighthouse results on the command line, it hasn't scaled well. A few screenworths of report was generally dumped to stdout right as Lighthouse finished up. Now, to keep your terminal happy, you will no longer see the reams of results printed to stdout. The HTML report is saved to disk by default, and you can automatically open it with lighthouse --view.

lighthouse --view flag

If you still want the stdout output, use --output=pretty. Oh so pretty.

CI coverage for Windows via AppVeyor - #1280

Thanks to a large effort from @XhmikosR, we now have an eye in the sky on Lighthouse's Windows compatibility. Now, all PRs are tested on both Linux and Windows.

New audits

New audit: DOM stats (total nodes, depth, width). (#1673) Get flagged if the size or depth of your DOM is big enough to cause big slowdowns.
New audit: Total byte weight audit (#1759). An extra check to make sure folks don't ship 5MB webpages.

Improvements

CLI: Add --chrome-flags option to CLI. (#1761)
CLI: Add --disable-storage-reset flag to skip clearing cache and storage (#1675)
Report: Centralize perf audits within Performance section (#1724)
Report: Collapse sections when all audits pass (#1742)
Config: Allow extension of default config (#1731)
Config: Configurable blank page options (#1732)
Config: Configurable page timeout (#1672)
Disable throttling for non-performance passes (#1740)
Reduce build size by 33% (#1756)
Enhanced display URLs (#1793)