lazy loading of eslint only for JS code

src/public/javascripts/note_editor.js

@@ -142,7 +142,6 @@ const noteEditor = (function() {
         else if (currentNote.detail.type === 'code') {
             if (!codeEditor) {
                 await requireLibrary(CODE_MIRROR);
-                await requireLibrary(JS_LINT);
 
                 CodeMirror.keyMap.default["Shift-Tab"] = "indentLess";
                 CodeMirror.keyMap.default["Tab"] = "indentMore";

src/public/javascripts/utils.js

@@ -143,24 +143,18 @@ const CODE_MIRROR = {
         "libraries/codemirror/addon/edit/matchbrackets.js",
         "libraries/codemirror/addon/edit/matchtags.js",
         "libraries/codemirror/addon/search/match-highlighter.js",
-        "libraries/codemirror/mode/meta.js"
-    ],
-    css: [
-        "libraries/codemirror/codemirror.css"
-    ]
-};
-
-const JS_LINT = {
-    js: [
+        "libraries/codemirror/mode/meta.js",
         "libraries/codemirror/addon/lint/lint.js",
-        "libraries/codemirror/addon/lint/eslint.js",
-        "libraries/eslint.js"
+        "libraries/codemirror/addon/lint/eslint.js"
     ],
     css: [
+        "libraries/codemirror/codemirror.css",
         "libraries/codemirror/addon/lint/lint.css"
     ]
 };
 
+const ESLINT = { js: [ "libraries/eslint.js" ] };
+
 async function requireLibrary(library) {
     if (library.css) {
         library.css.map(cssUrl => requireCss(cssUrl));
@@ -173,13 +167,13 @@ async function requireLibrary(library) {
     }
 }
 
-async function requireScript(url) {
-    const scripts = Array
-        .from(document.querySelectorAll('script'))
-        .map(scr => scr.src);
+const dynamicallyLoadedScripts = [];
 
-    if (!scripts.includes(url)) {
-        return $.ajax({
+async function requireScript(url) {
+    if (!dynamicallyLoadedScripts.includes(url)) {
+        dynamicallyLoadedScripts.push(url);
+
+        return await $.ajax({
             url: url,
             dataType: "script",
             cache: true

src/public/libraries/codemirror/addon/lint/eslint.js

@@ -11,8 +11,8 @@
 })(function(CodeMirror) {
   "use strict";
 
-  function validator(text, options) {
-    console.log("Validating script");
+  async function validator(text, options) {
+    await requireLibrary(ESLINT);
 
     var errors = new eslint().verify(text, {
         root: true,
@@ -42,8 +42,6 @@
         }
     });
 
-    console.log(errors);
-
     var result = [];
     if (errors) parseErrors(errors, result);
     return result;