Add in monaco through webpack.

app/assets/javascripts/repo/repo_bundle.js

-import monaco from 'monaco'
+import monaco from 'monaco-editor'
\ No newline at end of file
+
+monaco.editor.create(document.getElementById("ide"), {
+	value: "function hello() {\n\talert('Hello world!');\n}",
+	language: "javascript"
+});
\ No newline at end of file

app/views/projects/tree/_tree_content.html.haml

 .tree-content-holder
-  #tree-vue
+  #ide
 
   - if tree.readme
     = render "projects/tree/readme", readme: tree.readme