better error message when '.reveal' root node is missing hakimel#2217

fab4100 · Oct 1, 2021 · 7b62e81 · 7b62e81
1 parent d4c93ba
commit 7b62e81
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Showing 3 changed files with 9 additions and 4 deletions.
diff --git a/dist/reveal.esm.js b/dist/reveal.esm.js
diff --git a/dist/reveal.js b/dist/reveal.js
diff --git a/js/reveal.js b/js/reveal.js
@@ -44,6 +44,11 @@ export default function( revealElement, options ) {
 		revealElement = document.querySelector( '.reveal' );
 	}
 
+	// reveal.js can not be initialized without a root element
+	if( !revealElement ) {
+		throw 'Invalid or missing <div class="reveal"> element';
+	}
+
 	const Reveal = {};
 
 	// Configuration defaults, can be overridden at initialization time