import FinalizationRegistry from './MockFinalizationRegistry.js'MIT
Last active
September 20, 2024 23:48
-
-
Save cray0000/abecb1ca71fd28a1d8efff2be9e0f6c5 to your computer and use it in GitHub Desktop.
FinalizationRegistry mock using WeakRef. For React Native 0.75 New Architecture
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| export const REGISTRY_SWEEP_INTERVAL = 10000 | |
| // This is a mock implementation of FinalizationRegistry which uses WeakRef to | |
| // track the target objects. It's used in environments where FinalizationRegistry | |
| // is not available but WeakRef is (e.g. React Native >=0.75 on New Architecture). | |
| export class WeakRefBasedFinalizationRegistry { | |
| counter = 0 | |
| registrations = new Map() | |
| sweepTimeout | |
| constructor (finalize) { | |
| this.finalize = finalize | |
| } | |
| register (target, value, token) { | |
| this.registrations.set(this.counter, { | |
| targetRef: new WeakRef(target), | |
| tokenRef: token != null ? new WeakRef(token) : undefined, | |
| value | |
| }) | |
| this.counter++ | |
| this.scheduleSweep() | |
| } | |
| unregister (token) { | |
| if (token == null) return | |
| this.registrations.forEach((registration, key) => { | |
| if (registration.tokenRef?.deref() === token) { | |
| this.registrations.delete(key) | |
| } | |
| }) | |
| } | |
| // Bound so it can be used directly as setTimeout callback. | |
| sweep = () => { | |
| clearTimeout(this.sweepTimeout) | |
| this.sweepTimeout = undefined | |
| this.registrations.forEach((registration, key) => { | |
| if (registration.targetRef.deref() !== undefined) return | |
| const value = registration.value | |
| this.registrations.delete(key) | |
| this.finalize(value) | |
| }) | |
| if (this.registrations.size > 0) this.scheduleSweep() | |
| } | |
| scheduleSweep () { | |
| if (this.sweepTimeout) return | |
| this.sweepTimeout = setTimeout(this.sweep, REGISTRY_SWEEP_INTERVAL) | |
| } | |
| } | |
| let ExportedFinalizationRegistry | |
| if (typeof FinalizationRegistry !== 'undefined') { | |
| ExportedFinalizationRegistry = FinalizationRegistry | |
| } else if (typeof WeakRef !== 'undefined') { | |
| console.warn('FinalizationRegistry is not available in this environment. ' + | |
| 'Using a mock implementation: WeakRefBasedFinalizationRegistry') | |
| ExportedFinalizationRegistry = WeakRefBasedFinalizationRegistry | |
| } else { | |
| throw Error('Neither FinalizationRegistry nor WeakRef are available in this environment') | |
| } | |
| export default ExportedFinalizationRegistry |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment