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/*
* Copyright 2024 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.
*/
import {onHidden} from './onHidden.js';
import {runOnce} from './runOnce.js';
/**
* Runs the passed callback during the next idle period, or immediately
* if the browser's visibility state is (or becomes) hidden.
*/
export const whenIdle = (cb: () => void): number => {
const rIC = self.requestIdleCallback || self.setTimeout;
let handle = -1;
cb = runOnce(cb);
// If the document is hidden, run the callback immediately, otherwise
// race an idle callback with the next `visibilitychange` event.
if (document.visibilityState === 'hidden') {
cb();
} else {
handle = rIC(cb);
onHidden(cb);
}
return handle;
};
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