5efb4f09fd
Summary: The `Systrace` module implements a polyfill for the User Timing API that's: 1. Incompatible with the Web standard. This polyfill expects `performance.mark` and `performance.measure` to be used exactly like `Systrace.beginEvent` and `Systrace.endEvent` respectively. If not used like those functions, they throw an error at runtime, which is really bad. 2. Never actually used. See below. This polyfill is only installed if we're actually profiling on startup: https://www.internalfb.com/code/fbsource/[4d888a933920]/xplat/js/react-native-github/Libraries/Core/setUpSystrace.js?lines=17-21 While the only code that we have that uses this API is actually not installed if we're profiling: https://www.internalfb.com/code/fbsource/[4d888a933920]/xplat/js/react-native-github/Libraries/Core/setUpDeveloperTools.js?lines=20-21 This should be safe to remove then. We have plans to add proper support for this API in the short term, so this also gets out of the way of doing that. Additionally, installing this polyfill was the only reason why we had `setupSystrace`, so we can get rid of that too :) Changelog: [Internal] Reviewed By: javache Differential Revision: D39210813 fbshipit-source-id: a90b6237c311d2157069b41975d10b33f1f464ef |
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| .. | ||
| NativeJSCSamplingProfiler.js | ||
| PureComponentDebug.js | ||
| QuickPerformanceLogger.js | ||
| SamplingProfiler.js | ||
| Systrace.js | ||