Fix crash when highlighting unsupported languages

Resolves #2609

Author: Gerrit0

CHANGELOG.md

@@ -10,6 +10,7 @@
 -   Anchor links are no longer incorrectly checked for relative paths, #2604.
 -   Fixed an issue where line numbers reported in error messages could be incorrect, #2605.
 -   Fixed relative link detection for markdown links containing code in their label, #2606.
+-   TypeDoc will no longer crash when asked to render highlighted code for an unsupported language, #2609.
 
 ### Thanks!
 

src/lib/output/themes/MarkedPlugin.tsx

@@ -221,7 +221,7 @@ export class MarkedPlugin extends ContextAwareRendererComponent {
         this.parser = markdown({
             ...this.markdownItOptions,
             highlight: (code, lang) => {
-                code = highlight(code, lang || "ts");
+                code = this.getHighlighted(code, lang || "ts");
                 code = code.replace(/\n$/, "") + "\n";
 
                 if (!lang) {