1 files changed, 75 insertions, 0 deletions
diff --git a/cli/dts/lib.es2021.weakref.d.ts b/cli/dts/lib.es2021.weakref.d.ts
new file mode 100644
index 000000000..eb7764242
--- /dev/null
+++ b/cli/dts/lib.es2021.weakref.d.ts
@@ -0,0 +1,75 @@
+/*! *****************************************************************************
+Copyright (c) Microsoft Corporation. All rights reserved.
+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
+License at http://www.apache.org/licenses/LICENSE-2.0
+
+THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+MERCHANTABLITY OR NON-INFRINGEMENT.
+
+See the Apache Version 2.0 License for specific language governing permissions
+and 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;