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Viewing file:     getFirstHiddenTimePolyfill.js (1.06 KB)      -rwxrwxrwx

/*
 * Copyright 2020 Google LLC
 *
 * 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
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let firstHiddenTime = document.visibilityState === 'hidden' ? 0 : Infinity;
const onVisibilityChange = (event) => {
    if (document.visibilityState === 'hidden') {
        firstHiddenTime = event.timeStamp;
        removeEventListener('visibilitychange', onVisibilityChange, true);
    }
};
// Note: do not add event listeners unconditionally (outside of polyfills).
addEventListener('visibilitychange', onVisibilityChange, true);
export const getFirstHiddenTime = () => firstHiddenTime;