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private/react-native-fantom/runtime/patchWeakRef.js
58 строк
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Tim Yung
RN: Move `{packages => private}/react-native-fantom` (#51938)
12 июн 2025, 09:49
12 июн 2025, 09:49
d6f29c8
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/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @flow strict-local * @format */ let initialized = false; /** * This method modifies the built-in `WeakRef.prototype.deref` method to make * sure it is always called within the Event Loop in Fantom tests. * * Calling it outside the Event Loop can lead to inconsistent and confusing * behavior as WeakRefs semantics are tied to the task + microtasks lifecycle. */ export default function patchWeakRef(): void { if (initialized) { return; } initialized = true; // $FlowExpectedError[method-unbinding] const originalDeref = WeakRef.prototype.deref; // $FlowExpectedError[cannot-write] WeakRef.prototype.deref = function patchedDeref<T>(this: WeakRef<T>): T { // Lazily require the module to avoid loading it before the test logic. const Fantom = require('@react-native/fantom'); if (!Fantom.isInWorkLoop()) { throw new Error( 'Unexpected call to `WeakRef.deref()` outside of the Event Loop. Please use this method within `Fantom.runTask()`.', ); } return originalDeref.call(this); }; const OriginalWeakRef = WeakRef; global.WeakRef = function WeakRef(...args) { // Lazily require the module to avoid loading it before the test logic. const Fantom = require('@react-native/fantom'); if (!Fantom.isInWorkLoop()) { throw new Error( 'Unexpected instantiation of `WeakRef` outside of the Event Loop. Please create the instance within `Fantom.runTask()`.', ); } return new OriginalWeakRef(...args); }; }