plugins can be direct references or factory functions

demo.html

@@ -413,11 +413,11 @@ Reveal.on( 'customevent', function() {
 		<script type="module">
 
 			import Reveal from '/dist/reveal.js';
-			import zoom from '/plugin/zoom/zoom.js';
-			import notes from '/plugin/notes/notes.js';
-			import search from '/plugin/search/search.js';
-			import markdown from '/plugin/markdown/markdown.js';
-			import highlight from '/plugin/highlight/highlight.js';
+			import Zoom from '/plugin/zoom/zoom.js';
+			import Notes from '/plugin/notes/notes.js';
+			import Search from '/plugin/search/search.js';
+			import Markdown from '/plugin/markdown/markdown.js';
+			import Highlight from '/plugin/highlight/highlight.js';
 
 			// More info https://github.com/hakimel/reveal.js#configuration
 			Reveal.initialize({
@@ -428,8 +428,8 @@ Reveal.on( 'customevent', function() {
 
 				transition: 'slide', // none/fade/slide/convex/concave/zoom
 
-				// More info https://github.com/hakimel/reveal.js#dependencies
-				plugins: [ zoom(), notes(), search(), markdown(), highlight() ]
+				// More info https://github.com/hakimel/reveal.js#plugins
+				plugins: [ Zoom, Notes, Search, Markdown, Highlight ]
 			});
 
 		</script>

gulpfile.js

@@ -39,16 +39,14 @@ const rollupConfig = {
         babel({
             exclude: 'node_modules/**',
             compact: false,
-            presets: [
-                [
-                    '@babel/preset-env',
-                    {
-                        corejs: 3,
-                        useBuiltIns: 'entry',
-                        modules: false
-                    }
-                ]
-            ]
+            presets: [[
+                '@babel/preset-env',
+                {
+                    corejs: 3,
+                    useBuiltIns: 'entry',
+                    modules: false
+                }
+            ]]
         }),
         resolve(),
         terser()

index.html

@@ -28,10 +28,10 @@
 		<script>
 			// More info about config & dependencies:
 			// - https://github.com/hakimel/reveal.js#configuration
-			// - https://github.com/hakimel/reveal.js#dependencies
+			// - https://github.com/hakimel/reveal.js#plugins
 			Reveal.initialize({
 				hash: true,
-				plugins: [ RevealMarkdown(), RevealHighlight(), RevealNotes() ]
+				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
 			});
 		</script>
 	</body>

js/controllers/plugins.js

@@ -183,6 +183,11 @@ export default class Plugins {
 			plugin = arguments[1];
 			plugin.id = arguments[0];
 		}
+		// Plugin can optionally be a function which we call
+		// to create an instance of the plugin
+		else if( typeof plugin === 'function' ) {
+			plugin = plugin();
+		}
 
 		let id = plugin.id;