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1e3cd332a0
* Remove the 'alwaysUseRequestIdleCallbackPolyfill' feature flag **what is the change?:** Removes the feature flag 'alwaysUseRequestIdleCallbackPolyfill', such that we **always** use the polyfill for requestIdleCallback. **why make this change?:** We have been testing this feature flag at 100% for some time internally, and determined it works better for React than the native implementation. Looks like RN was overriding the flag to use the native when possible, but since no RN products are using 'async' mode it should be safe to switch this flag over for RN as well. **test plan:** We have already been testing this internally for some time. **issue:** internal task t28128480 * fix mistaken conditional * Add mocking of rAF, postMessage, and initial test for ReactScheduler **what is the change?:** - In all tests where we previously mocked rIC or relied on native mocking which no longer works, we are now mocking rAF and postMessage. - Also adds a basic initial test for ReactScheduler. NOTE -> we do plan to write headless browser tests for ReactScheduler! This is just an initial test, to verify that it works with the mocked out browser APIs as expected. **why make this change?:** We need to mock out the browser APIs more completely for the new 'ReactScheduler' to work in our tests. Many tests are depending on it, since it's used at a low level. By mocking the browser APIs rather than the 'react-scheduler' module, we enable testing the production bundles. This approach is trading isolation for accuracy. These tests will be closer to a real use. **test plan:** run the tests :) **issue:** internal task T28128480
44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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import invariant from 'fbjs/lib/invariant';
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// Exports ReactDOM.createRoot
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export const enableUserTimingAPI = __DEV__;
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// Mutating mode (React DOM, React ART, React Native):
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export const enableMutatingReconciler = true;
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// Experimental noop mode (currently unused):
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export const enableNoopReconciler = false;
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// Experimental persistent mode (Fabric):
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export const enablePersistentReconciler = false;
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// Experimental error-boundary API that can recover from errors within a single
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// render phase
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export const enableGetDerivedStateFromCatch = false;
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// Helps identify side effects in begin-phase lifecycle hooks and setState reducers:
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export const debugRenderPhaseSideEffects = false;
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// In some cases, StrictMode should also double-render lifecycles.
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// This can be confusing for tests though,
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// And it can be bad for performance in production.
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// This feature flag can be used to control the behavior:
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export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;
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// To preserve the "Pause on caught exceptions" behavior of the debugger, we
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// replay the begin phase of a failed component inside invokeGuardedCallback.
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export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
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// Warn about deprecated, async-unsafe lifecycles; relates to RFC #6:
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export const warnAboutDeprecatedLifecycles = false;
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// Only used in www builds.
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export function addUserTimingListener() {
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invariant(false, 'Not implemented.');
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}
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