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Index: package/lib/lib.esnext.array.d.ts
===================================================================
--- package/lib/lib.esnext.array.d.ts
+++ package/lib/lib.esnext.array.d.ts
@@ -0,0 +1,35 @@
+/*! *****************************************************************************
+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 ArrayConstructor {
+    /**
+     * Creates an array from an async iterator or iterable object.
+     * @param iterableOrArrayLike An async iterator or array-like object to convert to an array.
+     */
+    fromAsync<T>(iterableOrArrayLike: AsyncIterable<T> | Iterable<T | PromiseLike<T>> | ArrayLike<T | PromiseLike<T>>): Promise<T[]>;
+
+    /**
+     * Creates an array from an async iterator or iterable object.
+     *
+     * @param iterableOrArrayLike An async iterator or array-like object to convert to an array.
+     * @param mapfn A mapping function to call on every element of itarableOrArrayLike.
+     *      Each return value is awaited before being added to result array.
+     * @param thisArg Value of 'this' used when executing mapfn.
+     */
+    fromAsync<T, U>(iterableOrArrayLike: AsyncIterable<T> | Iterable<T> | ArrayLike<T>, mapFn: (value: Awaited<T>, index: number) => U, thisArg?: any): Promise<Awaited<U>[]>;
+}