mastodon/app/javascript/themes/glitch/util/schedule_idle_task.js
2017-11-17 19:29:16 -08:00

30 lines
756 B
JavaScript

// Wrapper to call requestIdleCallback() to schedule low-priority work.
// See https://developer.mozilla.org/en-US/docs/Web/API/Background_Tasks_API
// for a good breakdown of the concepts behind this.
import Queue from 'tiny-queue';
const taskQueue = new Queue();
let runningRequestIdleCallback = false;
function runTasks(deadline) {
while (taskQueue.length && deadline.timeRemaining() > 0) {
taskQueue.shift()();
}
if (taskQueue.length) {
requestIdleCallback(runTasks);
} else {
runningRequestIdleCallback = false;
}
}
function scheduleIdleTask(task) {
taskQueue.push(task);
if (!runningRequestIdleCallback) {
runningRequestIdleCallback = true;
requestIdleCallback(runTasks);
}
}
export default scheduleIdleTask;