This module allows you to run a queue of callback while on the browser’s idle time making sure the higher-priority work is performed first.


Install the module

npm install @wordpress/priority-queue --save

This package assumes that your code will run in an ES2015+ environment. If you’re using an environment that has limited or no support for such language features and APIs, you should include the polyfill shipped in @wordpress/babel-preset-default in your code.



Creates a context-aware queue that only executes the last task of a given context.


import { createQueue } from '@wordpress/priority-queue';

const queue = createQueue();

// Context objects.
const ctx1 = {};
const ctx2 = {};

// For a given context in the queue, only the last callback is executed.
queue.add( ctx1, () => console.log( 'This will be printed first' ) );
queue.add( ctx2, () => console.log( "This won't be printed" ) );
queue.add( ctx2, () => console.log( 'This will be printed second' ) );


  • WPPriorityQueue: Queue object with add, flush and reset methods.

Contributing to this package

This is an individual package that’s part of the Gutenberg project. The project is organized as a monorepo. It’s made up of multiple self-contained software packages, each with a specific purpose. The packages in this monorepo are published to npm and used by WordPress as well as other software projects.

To find out more about contributing to this package or Gutenberg as a whole, please read the project’s main contributor guide.