awesome-cordova-plugins/src/@ionic-native/core/bootstrap.ts

export function checkReady() {
  const DEVICE_READY_TIMEOUT = 5000;

  // To help developers using cordova, we listen for the device ready event and
  // log an error if it didn't fire in a reasonable amount of time. Generally,
  // when this happens, developers should remove and reinstall plugins, since
  // an inconsistent plugin is often the culprit.
  const before = Date.now();

  let didFireReady = false;
  document.addEventListener('deviceready', () => {
    console.log(`Ionic Native: deviceready event fired after ${(Date.now() - before)} ms`);
    didFireReady = true;
  });

  setTimeout(() => {
    if (!didFireReady && !!window.cordova) {
      console.warn(`Ionic Native: deviceready did not fire within ${DEVICE_READY_TIMEOUT}ms. This can happen when plugins are in an inconsistent state. Try removing plugins from plugins/ and reinstalling them.`);
    }
  }, DEVICE_READY_TIMEOUT);
}