How to use the @jupyterlab/codemirror.CodeMirrorMimeTypeService function in @jupyterlab/codemirror

function main(): void {
  const manager = new SessionManager();
  const session = new ClientSession({ manager, name: 'Example' });
  const mimeService = new CodeMirrorMimeTypeService();

  // Initialize the command registry with the bindings.
  const commands = new CommandRegistry();
  const useCapture = true;

  // Setup the keydown listener for the document.
  document.addEventListener(
    'keydown',
    event => {
      commands.processKeydownEvent(event);
    },
    useCapture
  );

  // Create the cell widget with a default rendermime instance.
  const rendermime = new RenderMimeRegistry({ initialFactories });

function main(): void {
  const manager = new SessionManager();
  const session = new ClientSession({ manager, name: 'Example' });
  const mimeService = new CodeMirrorMimeTypeService();

  // Initialize the command registry with the bindings.
  const commands = new CommandRegistry();
  const useCapture = true;

  // Setup the keydown listener for the document.
  document.addEventListener(
    'keydown',
    event => {
      commands.processKeydownEvent(event);
    },
    useCapture
  );

  // Create the cell widget with a default rendermime instance.
  const rendermime = new RenderMimeRegistry({ initialFactories });

describe('fileeditorcodewrapper', () => {
  const factoryService = new CodeMirrorEditorFactory();
  const modelFactory = new TextModelFactory();
  const mimeTypeService = new CodeMirrorMimeTypeService();
  let context: Context;
  let manager: ServiceManager.IManager;

  beforeAll(() => {
    manager = new ServiceManager({ standby: 'never' });
    return manager.ready;
  });

  describe('FileEditorCodeWrapper', () => {
    let widget: FileEditorCodeWrapper;

    beforeEach(() => {
      const path = UUID.uuid4() + '.py';
      context = new Context({ manager, factory: modelFactory, path });
      widget = new FileEditorCodeWrapper({
        factory: options => factoryService.newDocumentEditor(options),

describe('Debugger', () => {
  const service = new DebuggerService();
  const registry = new CommandRegistry();
  const factoryService = new CodeMirrorEditorFactory();
  const mimeTypeService = new CodeMirrorMimeTypeService();

  let sidebar: TestSidebar;

  beforeEach(() => {
    sidebar = new TestSidebar({
      service,
      callstackCommands: {
        registry,
        continue: '',
        terminate: '',
        next: '',
        stepIn: '',
        stepOut: ''
      },
      editorServices: {
        factoryService,

describe('fileeditorcodewrapper', () => {
  const factoryService = new CodeMirrorEditorFactory();
  const modelFactory = new TextModelFactory();
  const mimeTypeService = new CodeMirrorMimeTypeService();
  let context: Context;
  let manager: ServiceManager.IManager;

  beforeAll(() => {
    manager = new ServiceManager({ standby: 'never' });
    return manager.ready;
  });

  describe('FileEditorCodeWrapper', () => {
    let widget: FileEditorCodeWrapper;

    beforeEach(() => {
      const path = UUID.uuid4() + '.py';
      context = new Context({ manager, factory: modelFactory, path });
      widget = new FileEditorCodeWrapper({
        factory: options => factoryService.newDocumentEditor(options),

widget.disposed.connect((w: Widget) => {
        let index = widgets.indexOf(w);
        widgets.splice(index, 1);
      });
    }
  };

  let docRegistry = new DocumentRegistry();
  let docManager = new DocumentManager({
    registry: docRegistry,
    manager,
    opener
  });
  let editorServices = {
    factoryService: new CodeMirrorEditorFactory(),
    mimeTypeService: new CodeMirrorMimeTypeService()
  };
  let wFactory = new FileEditorFactory({
    editorServices,
    factoryOptions: {
      name: 'Editor',
      modelName: 'text',
      fileTypes: ['*'],
      defaultFor: ['*'],
      preferKernel: false,
      canStartKernel: true
    }
  });
  docRegistry.addWidgetFactory(wFactory);

  let commands = new CommandRegistry();

widget.disposed.connect((w: Widget) => {
        let index = widgets.indexOf(w);
        widgets.splice(index, 1);
      });
    }
  };

  let docRegistry = new DocumentRegistry();
  let docManager = new DocumentManager({
    registry: docRegistry,
    manager,
    opener
  });
  let editorServices = {
    factoryService: new CodeMirrorEditorFactory(),
    mimeTypeService: new CodeMirrorMimeTypeService()
  };
  let wFactory = new FileEditorFactory({
    editorServices,
    factoryOptions: {
      name: 'Editor',
      modelName: 'text',
      fileTypes: ['*'],
      defaultFor: ['*'],
      preferKernel: false,
      canStartKernel: true
    }
  });
  docRegistry.addWidgetFactory(wFactory);

  let commands = new CommandRegistry();