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Currently running into an issue with this.

const configDataNode = document.getElementById('config_data');
    const editor = CodeMirror.fromTextArea(
      document.getElementById('config_data_editor'),
        // lineNumbers: true,
        mode: 'javascript',
        // tabSize: 2,
        // indentWithTabs: true,
        // value: JSON.stringify(gon.config.initialData, 2, 2),
    editor.on('change', changeObject => {
      const {text} = changeObject;
      configDataNode.value = text;
Here is my code.
It is happening due to TextArea object's value field is undefined and thus inside the CodeMirror codemirror.js library options.value is initialising the doc variable also undefined, and thus later in source modeOption is getting matched with doc child field (if the doc is undefined, how a object key may exists).
var textarea_editor = document.getElementById("RichTextArea");
// so explicitly assign value to textarea object.
textarea_editor.value = "";
this.editor = CodeMirror.fromTextArea(textarea_editor, {
     tabSize: 4,
     mode: 'text/plain',
     theme: 'default',
     lineNumbers: true,
     styleActiveSelected: true,
     styleActiveLine: true,
     indentWithTabs: true,
     matchBrackets: true,
     highlightMatches: true,
Hope this may help someone.
        
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