fix issues with the es build and locales.

rollup.config.js

@@ -92,12 +92,13 @@ const config = [{
     }),
     commonjs(),
     dynamicImportVars({include: './src/editor/locale.js'}),
-    babel({babelHelpers: 'bundled', exclude: [/\/core-js\//]}),
+    babel({babelHelpers: 'bundled', exclude: [/\/core-js\//]}), // exclude core-js to avoid circular dependencies.
     nodePolyfills(),
     terser({keep_fnames: true})
   ]
 }];
 
+// config for dynamic extensions
 extensionDirs.forEach((extensionDir) => {
   const extensionName = basename(extensionDir);
   extensionName && config.push(
@@ -127,7 +128,7 @@ extensionDirs.forEach((extensionDir) => {
           preferBuiltins: true
         }),
         commonjs(),
-        dynamicImportVars({include: `dist/editor/system/extensions/${extensionName}${extensionName}.js`}),
+        dynamicImportVars({include: `src/editor/extensions/${extensionName}/${extensionName}.js`}),
         babel({babelHelpers: 'bundled', exclude: [/\/core-js\//]}),
         nodePolyfills(),
         terser({keep_fnames: true})

src/editor/extensions/ext-mathjax/ext-mathjax.js

@@ -44,7 +44,6 @@ export default {
       // mathjaxSrc = 'http://cdn.mathjax.org/mathjax/latest/MathJax.js',
       // Had been on https://c328740.ssl.cf1.rackcdn.com/mathjax/latest/MathJax.js?config=TeX-AMS-MML_SVG.js
       // Obtained Text-AMS-MML_SVG.js from https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.3/config/TeX-AMS-MML_SVG.js
-      mathjaxSrcSecure = 'mathjax/MathJax.min.js?config=TeX-AMS-MML_SVG.js',
       {uiStrings} = svgEditor;
     let
       math,
@@ -183,7 +182,7 @@ export default {
 
             try {
               // eslint-disable-next-line node/no-unsupported-features/es-syntax
-              await import(mathjaxSrcSecure);
+              await import('./mathjax/MathJax.min.js'); // ?config=TeX-AMS-MML_SVG.js');
               // When MathJax is loaded get the div where the math will be rendered.
               MathJax.Hub.queue.Push(function () {
                 math = MathJax.Hub.getAllJax('#mathjax_creator')[0];