Function waitFor

build-system/tasks/e2e/selenium-webdriver-controller.js:61–75

* Make the test runner wait until the value returned by the valueFn matches * the given condition. * @param {!WebDriver} driver * @param {function(): !Promise } valueFn * @param {function(T2): ?T1} condition * @param {function(T1): T2} opt_mutate * @return {!Promise<?T2>} * @template T1 *

(driver, valueFn, condition, opt_mutate)

 * @template T2
 */
async function waitFor(driver, valueFn, condition, opt_mutate) {
  const conditionValue = (value) => {
    // Box the value in an object, so values that are present but falsy
    // (like "") do not cause driver.wait to continue waiting.
    return Boolean(condition(value));
  };

  /* TODO: fix incorrect typing. */
  /** @type {any} */
  const result = await driver.wait(
    expectCondition(valueFn, conditionValue, opt_mutate)
  );

  return result;
}

class SeleniumWebDriverController {
  /**