How to use the chrome-launcher.default.defaultFlags function in chrome-launcher

export type ChromiumExtensionRunnerParams = {|
  ...ExtensionRunnerParams,
  // Chromium desktop CLI params.
  ...ChromiumSpecificRunnerParams,
|};

const log = createLogger(__filename);

const asyncMkdirp = promisify(mkdirp);

const EXCLUDED_CHROME_FLAGS = [
  '--disable-extensions',
  '--mute-audio',
];

export const DEFAULT_CHROME_FLAGS = ChromeLauncher.defaultFlags()
  .filter((flag) => !EXCLUDED_CHROME_FLAGS.includes(flag));

/**
 * Implements an IExtensionRunner which manages a Chromium instance.
 */
export class ChromiumExtensionRunner {
  cleanupCallbacks: Set;
  params: ChromiumExtensionRunnerParams;
  chromiumInstance: LaunchedChrome;
  chromiumLaunch: typeof defaultChromiumLaunch;
  reloadManagerExtension: string;
  wss: WebSocket.Server;
  exiting: boolean;
  _promiseSetupDone: ?Promise;

  constructor(params: ChromiumExtensionRunnerParams) {