mirror of
https://github.com/denoland/deno
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76 lines
3 KiB
TypeScript
76 lines
3 KiB
TypeScript
/*! *****************************************************************************
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Copyright (c) Microsoft Corporation. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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this file except in compliance with the License. You may obtain a copy of the
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License at http://www.apache.org/licenses/LICENSE-2.0
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THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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MERCHANTABLITY OR NON-INFRINGEMENT.
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See the Apache Version 2.0 License for specific language governing permissions
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and limitations under the License.
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***************************************************************************** */
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/// <reference no-default-lib="true"/>
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interface WeakRef<T extends WeakKey> {
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readonly [Symbol.toStringTag]: "WeakRef";
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/**
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* Returns the WeakRef instance's target value, or undefined if the target value has been
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* reclaimed.
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* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
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*/
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deref(): T | undefined;
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}
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interface WeakRefConstructor {
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readonly prototype: WeakRef<any>;
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/**
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* Creates a WeakRef instance for the given target value.
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* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
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* @param target The target value for the WeakRef instance.
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*/
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new <T extends WeakKey>(target: T): WeakRef<T>;
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}
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declare var WeakRef: WeakRefConstructor;
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interface FinalizationRegistry<T> {
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readonly [Symbol.toStringTag]: "FinalizationRegistry";
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/**
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* Registers a value with the registry.
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* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
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* @param target The target value to register.
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* @param heldValue The value to pass to the finalizer for this value. This cannot be the
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* target value.
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* @param unregisterToken The token to pass to the unregister method to unregister the target
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* value. If not provided, the target cannot be unregistered.
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*/
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register(target: WeakKey, heldValue: T, unregisterToken?: WeakKey): void;
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/**
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* Unregisters a value from the registry.
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* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
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* @param unregisterToken The token that was used as the unregisterToken argument when calling
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* register to register the target value.
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*/
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unregister(unregisterToken: WeakKey): void;
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}
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interface FinalizationRegistryConstructor {
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readonly prototype: FinalizationRegistry<any>;
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/**
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* Creates a finalization registry with an associated cleanup callback
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* @param cleanupCallback The callback to call after a value in the registry has been reclaimed.
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*/
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new <T>(cleanupCallback: (heldValue: T) => void): FinalizationRegistry<T>;
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}
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declare var FinalizationRegistry: FinalizationRegistryConstructor;
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