fix

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

@@ -0,0 +1,44 @@
+/*
+Language: Dockerfile
+Requires: bash.js
+Author: Alexis Hénaut <alexis@henaut.net>
+Description: language definition for Dockerfile files
+Website: https://docs.docker.com/engine/reference/builder/
+Category: config
+*/
+
+/** @type LanguageFn */
+function dockerfile(hljs) {
+  const KEYWORDS = [
+    "from",
+    "maintainer",
+    "expose",
+    "env",
+    "arg",
+    "user",
+    "onbuild",
+    "stopsignal"
+  ];
+  return {
+    name: 'Dockerfile',
+    aliases: [ 'docker' ],
+    case_insensitive: true,
+    keywords: KEYWORDS,
+    contains: [
+      hljs.HASH_COMMENT_MODE,
+      hljs.APOS_STRING_MODE,
+      hljs.QUOTE_STRING_MODE,
+      hljs.NUMBER_MODE,
+      {
+        beginKeywords: 'run cmd entrypoint volume add copy workdir label healthcheck shell',
+        starts: {
+          end: /[^\\]$/,
+          subLanguage: 'bash'
+        }
+      }
+    ],
+    illegal: '</'
+  };
+}
+
+export { dockerfile as default };