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/*! *****************************************************************************Copyright (c) Microsoft Corporation. All rights reserved.Licensed under the Apache License, Version 2.0 (the "License"); you may not usethis file except in compliance with the License. You may obtain a copy of theLicense at http://www.apache.org/licenses/LICENSE-2.0
THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANYKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIEDWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,MERCHANTABLITY OR NON-INFRINGEMENT.
See the Apache Version 2.0 License for specific language governing permissionsand limitations under the License.***************************************************************************** */


/// <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<T> {    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: T, 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<any>;
    /**     * 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<T>(cleanupCallback: (heldValue: T) => void): FinalizationRegistry<T>;}
declare var FinalizationRegistry: FinalizationRegistryConstructor;