fes.js/packages/plugin-monaco-editor/src/runtime/loader.tpl

{{#IS_VITE}}
import editorWorker from 'monaco-editor/esm/vs/editor/editor.worker?worker';
import jsonWorker from 'monaco-editor/esm/vs/language/json/json.worker?worker';
import cssWorker from 'monaco-editor/esm/vs/language/css/css.worker?worker';
import htmlWorker from 'monaco-editor/esm/vs/language/html/html.worker?worker';
import tsWorker from 'monaco-editor/esm/vs/language/typescript/ts.worker?worker';

self.MonacoEnvironment = {
    getWorker(_, label) {
        if (label === 'json') return new jsonWorker();
        if (label === 'css' || label === 'scss' || label === 'less') return new cssWorker();
        if (label === 'html' || label === 'handlebars' || label === 'razor') return new htmlWorker();
        if (label === 'typescript' || label === 'javascript') return new tsWorker();
        return new editorWorker();
    }
};
{{/IS_VITE}}

import * as monaco from '{{{ MONACO_EDITOR }}}';
import defaultTheme from './theme/default';

defaultTheme.register(monaco);

export default monaco;