a few seconds ago

What is the process for converting the Monaco editor into a React component using my language definition file (JS), when the definition requires the use of require that is not defined?

I am currently developing a monaco editor for a HTML frontend, using my own language definition called "mylang". I am unsure whether it is essential to create the editor as a react component. I have encountered an issue with the require command in mylang.js. Despite turning the monaco editor into a react component, it immediately stops working once I link the language definition file. The error message "require is not defined" appears, and if I remove the require function, the editor fails to recognize the code. Below is the code snippet that loads the language definition file and defines the JavaScript language for the monaco editor. Please note that the <pre></pre> tags must be used to enclose every code snippet when generating the code, as the output is written to an HTML file on the frontend.
<!-- Load language definition (mylang.js) -->
<!-- There is an issue with the require command in mylang -->
<script src="./mylang.js"></script>

<!DOCTYPE html>
    <meta charset="UTF-8" />
    <title>React Monaco Editor Example</title>
    <script src="[email protected]/umd/react.development.js"></script>
    <script src="[email protected]/umd/react-dom.development.js"></script>
    <script src="[email protected]/min/vs/loader.js"></script>
    <div id="root"></div>
      // Define a React component that uses the Monaco editor
      class MonacoEditor extends React.Component {
        constructor(props) {

          this.state = {
            editorValue: "",

          // Load the Monaco editor
          require.config({ paths: { vs: "[email protected]/min/vs" } });
          require(["vs/editor/editor.main"], () => {
            // Initialize the editor
            const editor = monaco.editor.create(document.getElementById("container"), {
              value: "",
              language: "mylang",
              lineNumbers: false
        render() {
          return React.createElement(
          React.createElement('div', { id: 'container', style: { height: '400px', width: '800px' } }),
          React.createElement('pre', null, this.state.editorValue)

      // Render the MonacoEditor component to the root element
      ReactDOM.render(React.createElement(MonacoEditor, null), document.getElementById("root"));    
Moreover, I have included the opening lines of the language definition file, which contains the keyword list, as shown below:
//Define the language and its id
monaco.languages.register({ id: 'mylang' });

//List of keywords
const mylangKeywords = [
  'continue', 'for', 'and', 'or',....
a few seconds ago
Verified Answer
The reason you are getting the "require is not defined" error is because require is a global function in Node.js, but not in the browser. Since you are working with an HTML page and JavaScript code that runs in the browser, you need to use a module loader like RequireJS or SystemJS to handle the require function. To use RequireJS, you will need to include the RequireJS script in your HTML file and define a configuration with your module paths. Here's an example:
&lt;script data-main="main.js" src="">&lt;/script&gt;
In your main.js file, you will define the necessary modules and dependencies:
  paths: {
    "vs": "[email protected]/min/vs",
    "mylang": "./mylang"

require(["vs/editor/editor.main", "mylang"], () => {
  console.log("Monaco Editor and MyLang loaded");
  // Initialize the editor
  const editor = monaco.editor.create(document.getElementById("container"), {
    value: "",
    language: "mylang",
    lineNumbers: false
Also, in your mylang.js file, you will need to wrap your code inside a define() function in order to expose it as a module:
define(function(require, exports, module) {
  // Define the language
  monaco.languages.register({ id: 'mylang' });
With these changes in place, you should be able to use require properly and load your language definition file.