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diff --git a/cli/tsc/dts/lib.es2016.intl.d.ts b/cli/tsc/dts/lib.es2016.intl.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"/>
+
+declare namespace Intl {
+    /**
+     * The `Intl.getCanonicalLocales()` method returns an array containing
+     * the canonical locale names. Duplicates will be omitted and elements
+     * will be validated as structurally valid language tags.
+     *
+     * [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/getCanonicalLocales)
+     *
+     * @param locale A list of String values for which to get the canonical locale names
+     * @returns An array containing the canonical and validated locale names.
+     */
+    function getCanonicalLocales(locale?: string | readonly string[]): string[];
+}