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diff --git a/cli/dts/lib.es2018.asyncgenerator.d.ts b/cli/dts/lib.es2018.asyncgenerator.d.ts
new file mode 100644
index 000000000..546a8c2e9
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+++ b/cli/dts/lib.es2018.asyncgenerator.d.ts
@@ -0,0 +1,79 @@
+/*! *****************************************************************************
+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"/>
+
+
+/// <reference lib="es2018.asynciterable" />
+
+interface AsyncGenerator<T = unknown, TReturn = any, TNext = unknown> extends AsyncIterator<T, TReturn, TNext> {
+    // NOTE: 'next' is defined using a tuple to ensure we report the correct assignability errors in all places.
+    next(...args: [] | [TNext]): Promise<IteratorResult<T, TReturn>>;
+    return(value: TReturn | PromiseLike<TReturn>): Promise<IteratorResult<T, TReturn>>;
+    throw(e: any): Promise<IteratorResult<T, TReturn>>;
+    [Symbol.asyncIterator](): AsyncGenerator<T, TReturn, TNext>;
+}
+
+interface AsyncGeneratorFunction {
+    /**
+     * Creates a new AsyncGenerator object.
+     * @param args A list of arguments the function accepts.
+     */
+    new (...args: any[]): AsyncGenerator;
+    /**
+     * Creates a new AsyncGenerator object.
+     * @param args A list of arguments the function accepts.
+     */
+    (...args: any[]): AsyncGenerator;
+    /**
+     * The length of the arguments.
+     */
+    readonly length: number;
+    /**
+     * Returns the name of the function.
+     */
+    readonly name: string;
+    /**
+     * A reference to the prototype.
+     */
+    readonly prototype: AsyncGenerator;
+}
+
+interface AsyncGeneratorFunctionConstructor {
+    /**
+     * Creates a new AsyncGenerator function.
+     * @param args A list of arguments the function accepts.
+     */
+    new (...args: string[]): AsyncGeneratorFunction;
+    /**
+     * Creates a new AsyncGenerator function.
+     * @param args A list of arguments the function accepts.
+     */
+    (...args: string[]): AsyncGeneratorFunction;
+    /**
+     * The length of the arguments.
+     */
+    readonly length: number;
+    /**
+     * Returns the name of the function.
+     */
+    readonly name: string;
+    /**
+     * A reference to the prototype.
+     */
+    readonly prototype: AsyncGeneratorFunction;
+}