monaco-editor/monaco-editor-samples/browser-esm-vite-react/src/components/Editor.tsx

import { VFC, useRef, useState, useEffect } from "react";
import * as monaco from "monaco-editor/esm/vs/editor/editor.api";
import styles from "./Editor.module.css";

export const Editor: VFC = () => {
  const [editor, setEditor] =
    useState<monaco.editor.IStandaloneCodeEditor | null>(null);
  const monacoEl = useRef(null);

  useEffect(() => {
    if (monacoEl && !editor) {
      setEditor(
        monaco.editor.create(monacoEl.current!, {
          value: ['function x() {', '\tconsole.log("Hello world!");', '}'].join('\n'),
          language: "typescript",
        })
      );
    }

    return () => editor?.dispose();
  }, [monacoEl.current]);

  return <div className={styles.Editor} ref={monacoEl}></div>;
};