denoland-deno/cli/dts/lib.esnext.weakref.d.ts

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Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
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See the Apache Version 2.0 License for specific language governing permissions
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***************************************************************************** */

/// <reference no-default-lib="true"/>

interface WeakRef<T extends object> {
  readonly [Symbol.toStringTag]: "WeakRef";

  /**
     * Returns the WeakRef instance's target object, or undefined if the target object has been
     * reclaimed.
     */
  deref(): T | undefined;
}

interface WeakRefConstructor {
  readonly prototype: WeakRef<any>;

  /**
     * Creates a WeakRef instance for the given target object.
     * @param target The target object for the WeakRef instance.
     */
  new <T extends object>(target?: T): WeakRef<T>;
}

declare var WeakRef: WeakRefConstructor;

interface FinalizationRegistry {
  readonly [Symbol.toStringTag]: "FinalizationRegistry";

  /**
     * Registers an object with the registry.
     * @param target The target object to register.
     * @param heldValue The value to pass to the finalizer for this object. This cannot be the
     * target object.
     * @param unregisterToken The token to pass to the unregister method to unregister the target
     * object. If provided (and not undefined), this must be an object. If not provided, the target
     * cannot be unregistered.
     */
  register(target: object, heldValue: any, unregisterToken?: object): void;

  /**
     * Unregisters an object from the registry.
     * @param unregisterToken The token that was used as the unregisterToken argument when calling
     * register to register the target object.
     */
  unregister(unregisterToken: object): void;
}

interface FinalizationRegistryConstructor {
  readonly prototype: FinalizationRegistry;

  /**
     * Creates a finalization registry with an associated cleanup callback
     * @param cleanupCallback The callback to call after an object in the registry has been reclaimed.
     */
  new (cleanupCallback: (heldValue: any) => void): FinalizationRegistry;
}

declare var FinalizationRegistry: FinalizationRegistryConstructor;