pinafore/routes/_utils/scheduleIdleTask.js

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2018-01-31 05:17:01 +00:00
// 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
}
}
export function scheduleIdleTask(task) {
taskQueue.push(task)
if (!runningRequestIdleCallback) {
runningRequestIdleCallback = true
requestIdleCallback(runTasks)
}
}