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fix: use SharedArrayBuffer only when cross-origin isolation is enabled (#20831)

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* fix: check cross-origin isolation for SharedArrayBuffer

* chore: remove unused a $FlowFixMe comment

* prettier
This commit is contained in:
Toru Kobayashi
2021-03-22 19:50:49 +00:00
committed by Dan Abramov
parent 8e5adfbd7e
commit 8cc6ff2488
1 changed files with 9 additions and 4 deletions
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packages/scheduler/src/SchedulerProfiling.js
+9 -4
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@@ -15,13 +15,18 @@ import {NoPriority} from './SchedulerPriorities';
let runIdCounter: number = 0;
let mainThreadIdCounter: number = 0;
const isEnabledSharedArrayBuffer =
// $FlowFixMe Flow doesn't know about SharedArrayBuffer
typeof SharedArrayBuffer === 'function' &&
// We only use SharedArrayBuffer when cross origin isolation is enabled.
typeof window !== 'undefined' &&
window.crossOriginIsolated === true;
const profilingStateSize = 4;
export const sharedProfilingBuffer = enableProfiling
? // $FlowFixMe Flow doesn't know about SharedArrayBuffer
typeof SharedArrayBuffer === 'function'
? isEnabledSharedArrayBuffer
? new SharedArrayBuffer(profilingStateSize * Int32Array.BYTES_PER_ELEMENT)
: // $FlowFixMe Flow doesn't know about ArrayBuffer
typeof ArrayBuffer === 'function'
: typeof ArrayBuffer === 'function'
? new ArrayBuffer(profilingStateSize * Int32Array.BYTES_PER_ELEMENT)
: null // Don't crash the init path on IE9
: null;