From b843104217592162be9654f9e19700c4e11890d7 Mon Sep 17 00:00:00 2001
From: Paul Irish <paul.irish@gmail.com>
Date: Mon, 15 May 2017 23:11:49 -0700
Subject: [PATCH] Docs: Update ChromeLauncher usage example (#2260)

* Update usage example. Add recipe.

* forget the recipe.
---
 readme.md | 35 ++++++++++++-----------------------
 1 file changed, 12 insertions(+), 23 deletions(-)

diff --git a/readme.md b/readme.md
index 4caf28dea4..65ae008052 100644
--- a/readme.md
+++ b/readme.md
@@ -160,32 +160,21 @@ assumes you've installed Lighthouse as a dependency (`yarn add --dev lighthouse`
 
 ```javascript
 const lighthouse = require('lighthouse');
-const ChromeLauncher = require('lighthouse/chrome-launcher/chrome-launcher.js');
-const Printer = require('lighthouse/lighthouse-cli/printer');
+const chromeLauncher = require('lighthouse/chrome-launcher/chrome-launcher');
 
-function launchChromeAndRunLighthouse(url, flags, config) {
-  const launchedChrome = ChromeLauncher.launch();
-
-  launchedChrome
-    .then(() => lighthouse(url, flags, config)) // Run Lighthouse.
-    .then(results => launchedChrome.kill().then(() => results)) // Kill Chrome and return results.
-    .catch(err => {
-      // Kill Chrome if there's an error.
-      return launchedChrome.kill().then(() => {
-        throw err;
-      });
-    });
+function launchChromeAndRunLighthouse(url, flags, config = null) {
+  return chromeLauncher.launch().then(chrome => {
+    flags.port = chrome.port;
+    return lighthouse(url, flags, config).then(results =>
+      chrome.kill().then(() => results)
+    );
+  });
 }
 
-// Use an existing config or create a custom one.
-const config = require('lighthouse/lighthouse-core/config/perf.json');
-const url = 'https://example.com';
-const flags = {output: 'html'};
-
-launchChromeAndRunLighthouse(url, flags, config).then(lighthouseResults => {
-  lighthouseResults.artifacts = undefined; // You can save the artifacts separately if so desired
-  return Printer.write(lighthouseResults, flags.output);
-}).catch(err => console.error(err));
+// In use:
+const flags = {output: 'json'};
+launchChromeAndRunLighthouse('https://example.com', flags)
+	.then(results => console.log(results));
 ```
 
 ### Recipes