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1/**
2 * @license
3 * Copyright 2019 Google LLC
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17/**
18 * Attempts to get the most accurate browser language setting.
19 *
20 * <p>Adapted from getUserLanguage in packages/auth/src/utils.js for TypeScript.
21 *
22 * <p>Defers default language specification to server logic for consistency.
23 *
24 * @param navigatorLanguage Enables tests to override read-only {@link NavigatorLanguage}.
25 */
26export declare function getUserLanguage(navigatorLanguage?: NavigatorLanguage): string;