fix

book/node_modules/highlight.js/es/languages/erb.js

@@ -0,0 +1,29 @@
+/*
+Language: ERB (Embedded Ruby)
+Requires: xml.js, ruby.js
+Author: Lucas Mazza <lucastmazza@gmail.com>
+Contributors: Kassio Borges <kassioborgesm@gmail.com>
+Description: "Bridge" language defining fragments of Ruby in HTML within <% .. %>
+Website: https://ruby-doc.org/stdlib-2.6.5/libdoc/erb/rdoc/ERB.html
+Category: template
+*/
+
+/** @type LanguageFn */
+function erb(hljs) {
+  return {
+    name: 'ERB',
+    subLanguage: 'xml',
+    contains: [
+      hljs.COMMENT('<%#', '%>'),
+      {
+        begin: '<%[%=-]?',
+        end: '[%-]?%>',
+        subLanguage: 'ruby',
+        excludeBegin: true,
+        excludeEnd: true
+      }
+    ]
+  };
+}
+
+export { erb as default };