Scheduler Polyfill

This is a polyfill for the Prioritized Task Scheduling API. Documentation on the API shape along with examples can be found in the explainer.

The polyfill includes implementations of Scheduler, exposed through self.scheduler, as well as TaskController and TaskPriorityChangeEvent classes.

The implementation uses a combination of setTimeout, MessageChannel, and requestIdleCallback to implement task scheduling, falling back to setTimeout when other APIs are not available.

Requirements

A browser that supports ES6 is required for this polyfill.

Usage

Include via unpkg:

<script src="https://unpkg.com/scheduler-polyfill"></script>

Using with npm and a bundler:

npm install scheduler-polyfill

import 'scheduler-polyfill';

Building from source:

git clone https://github.com/GoogleChromeLabs/scheduler-polyfill
cd scheduler-polyfill
npm i
npm test        # Tests should pass
npm run build   # Outputs minified polyfill to dist/

<script src="/path_to_polyfill/scheduler-polyfill.js"></script>

License

Apache 2.0