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diff --git a/cli/dts/lib.es2020.promise.d.ts b/cli/dts/lib.es2020.promise.d.ts
new file mode 100644
index 000000000..a3b2c0aa8
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+++ b/cli/dts/lib.es2020.promise.d.ts
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+/*! *****************************************************************************
+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 PromiseFulfilledResult<T> {
+    status: "fulfilled";
+    value: T;
+}
+
+interface PromiseRejectedResult {
+    status: "rejected";
+    reason: any;
+}
+
+type PromiseSettledResult<T> = PromiseFulfilledResult<T> | PromiseRejectedResult;
+
+interface PromiseConstructor {
+    /**
+     * Creates a Promise that is resolved with an array of results when all
+     * of the provided Promises resolve or reject.
+     * @param values An array of Promises.
+     * @returns A new Promise.
+     */
+    allSettled<T extends readonly unknown[] | readonly [unknown]>(values: T):
+        Promise<{ -readonly [P in keyof T]: PromiseSettledResult<T[P] extends PromiseLike<infer U> ? U : T[P]> }>;
+
+    /**
+     * Creates a Promise that is resolved with an array of results when all
+     * of the provided Promises resolve or reject.
+     * @param values An array of Promises.
+     * @returns A new Promise.
+     */
+    allSettled<T>(values: Iterable<T>): Promise<PromiseSettledResult<T extends PromiseLike<infer U> ? U : T>[]>;
+}