Improve scheduling of requestIdleCallback tasks (#3477)
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// Wrapper to call requestIdleCallback() to schedule low-priority work.
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// See https://developer.mozilla.org/en-US/docs/Web/API/Background_Tasks_API
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// for a good breakdown of the concepts behind this.
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import Queue from 'tiny-queue'; |
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const taskQueue = new Queue(); |
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let runningRequestIdleCallback = false; |
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function runTasks(deadline) { |
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while (taskQueue.length && deadline.timeRemaining() > 0) { |
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taskQueue.shift()(); |
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} |
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if (taskQueue.length) { |
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requestIdleCallback(runTasks); |
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} else { |
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runningRequestIdleCallback = false; |
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} |
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} |
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function scheduleIdleTask(task) { |
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taskQueue.push(task); |
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if (!runningRequestIdleCallback) { |
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runningRequestIdleCallback = true; |
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requestIdleCallback(runTasks); |
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} |
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} |
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export default scheduleIdleTask; |
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