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/// <reference no-default-lib="true"/>
interface WeakRef<T extends WeakKey> {
readonly [Symbol.toStringTag]: "WeakRef";
/**
* Returns the WeakRef instance's target value, or undefined if the target value has been
* reclaimed.
* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
*/
deref(): T | undefined;
}
interface WeakRefConstructor {
readonly prototype: WeakRef<any>;
/**
* Creates a WeakRef instance for the given target value.
* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
* @param target The target value for the WeakRef instance.
*/
new <T extends WeakKey>(target: T): WeakRef<T>;
}
declare var WeakRef: WeakRefConstructor;
interface FinalizationRegistry<T> {
readonly [Symbol.toStringTag]: "FinalizationRegistry";
/**
* Registers a value with the registry.
* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
* @param target The target value to register.
* @param heldValue The value to pass to the finalizer for this value. This cannot be the
* target value.
* @param unregisterToken The token to pass to the unregister method to unregister the target
* value. If not provided, the target cannot be unregistered.
*/
register(target: WeakKey, heldValue: T, unregisterToken?: WeakKey): void;
/**
* Unregisters a value from the registry.
* In es2023 the value can be either a symbol or an object, in previous versions only object is permissible.
* @param unregisterToken The token that was used as the unregisterToken argument when calling
* register to register the target value.
*/
unregister(unregisterToken: WeakKey): void;
}
interface FinalizationRegistryConstructor {
readonly prototype: FinalizationRegistry<any>;
/**
* Creates a finalization registry with an associated cleanup callback
* @param cleanupCallback The callback to call after a value in the registry has been reclaimed.
*/
new <T>(cleanupCallback: (heldValue: T) => void): FinalizationRegistry<T>;
}
declare var FinalizationRegistry: FinalizationRegistryConstructor;
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