function waitFor(condition: Function, options: any): Promise {
  options = Object.assign({
    interval: 50,
    timeout: 2000
  });

  let timedOut = false
  return Promise.race([new Promise((rs, rj) => {
      window.setTimeout(() => {
        timedOut = true;
        rj('condition not met within ' + options.timeout + ' ms');
      }, options.timeout);
    }),
    new Promise((rs) => {
      const test = () => {
        try {
          if (condition()) {
            rs();
            return;
          }
        } catch (err) {}
        timedOut || window.setTimeout(test, options.interval);
      }
      test();
    })
  ]);
}