Creating a Plugin 4.0.0

We provide a lightweight specification and API for plugins. This is used by our default plugins like code highlighting and Markdown but can also be used to create your own plugins.

Plugin Definition

Plugins are objects that contain the following properties.

Property	Value
id String	The plugins unique ID. This can be used to retrieve the plugin instance via `Reveal.getPlugin(<id>)`.
init Function	An optional function that is called when the plugin should run. It's invoked with one argument; a reference to the presentation instance that the plugin was registered with. The init function can optionally return a Promise. If a Promise is returned, reveal.js will wait for it to resolve before the presentation finishes initialization and fires the ready event.
destroy Function	Optional function that is called when the reveal.js instance that this plugin is registered to is uninitialized.

Here's an example plugin which shuffles all slides in a presentation when the T key is pressed. Note that we export a function that returns a new plugin object. This is done because there may be multiple presentation instances on the same page, and each should have their own instance of our plugin.

// toaster.js
export default () => ({
  id: 'toaster',
  init: ( deck ) => {
    deck.addKeyBinding( { keyCode: 84, key: 'T' }, () => {
      deck.shuffle();
      console.log('🍻');
    } );
  }
})

Registering a Plugin

Plugins are registered by including them in the plugins array of the config options. You can also register a plugin at runtime using Reveal.registerPlugin( Plugin ).

import Reveal from 'dist/reveal.esm.js';
import Toaster from 'toaster.js';

Reveal.initialize({
  plugins: [ Toaster ]
});

Async Plugins

If your plugin needs to run asynchronous code before reveal.js finishes initializing it can return a Promise. Here's an example plugin that will delay initialization for three seconds.

let WaitForIt = {
  id: "wait-for-it",
  init: deck => {
    return new Promise( resolve => setTimeout( resolve, 3000 ) )
  }
}

Reveal.initialize({ plugins: [ WaitForIt ] }).then( () => {
  console.log( "Three seconds later..." );
} )