68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
/**
|
|
* Copyright (c) 2013-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @flow
|
|
*/
|
|
|
|
import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
|
|
import typeof * as FeatureFlagsShimType from './ReactFeatureFlags.www';
|
|
|
|
// Re-export dynamic flags from the www version.
|
|
export const {
|
|
enableSuspense,
|
|
debugRenderPhaseSideEffects,
|
|
debugRenderPhaseSideEffectsForStrictMode,
|
|
enableGetDerivedStateFromCatch,
|
|
replayFailedUnitOfWorkWithInvokeGuardedCallback,
|
|
warnAboutDeprecatedLifecycles,
|
|
} = require('ReactFeatureFlags');
|
|
|
|
// The rest of the flags are static for better dead code elimination.
|
|
export const warnAboutLegacyContextAPI = __DEV__;
|
|
|
|
// In www, we have experimental support for gathering data
|
|
// from User Timing API calls in production. By default, we
|
|
// only emit performance.mark/measure calls in __DEV__. But if
|
|
// somebody calls addUserTimingListener() which is exposed as an
|
|
// experimental FB-only export, we call performance.mark/measure
|
|
// as long as there is more than a single listener.
|
|
export let enableUserTimingAPI = __DEV__;
|
|
|
|
export const enableProfilerTimer = __PROFILE__;
|
|
|
|
let refCount = 0;
|
|
export function addUserTimingListener() {
|
|
if (__DEV__) {
|
|
// Noop.
|
|
return () => {};
|
|
}
|
|
refCount++;
|
|
updateFlagOutsideOfReactCallStack();
|
|
return () => {
|
|
refCount--;
|
|
updateFlagOutsideOfReactCallStack();
|
|
};
|
|
}
|
|
|
|
// The flag is intentionally updated in a timeout.
|
|
// We don't support toggling it during reconciliation or
|
|
// commit since that would cause mismatching user timing API calls.
|
|
let timeout = null;
|
|
function updateFlagOutsideOfReactCallStack() {
|
|
if (!timeout) {
|
|
timeout = setTimeout(() => {
|
|
timeout = null;
|
|
enableUserTimingAPI = refCount > 0;
|
|
});
|
|
}
|
|
}
|
|
|
|
// Flow magic to verify the exports of this file match the original version.
|
|
// eslint-disable-next-line no-unused-vars
|
|
type Check<_X, Y: _X, X: Y = _X> = null;
|
|
// eslint-disable-next-line no-unused-expressions
|
|
(null: Check<FeatureFlagsShimType, FeatureFlagsType>);
|