getRegistrations method
Returns all ServiceWorkerRegistrations associated with a ServiceWorkerContainer in an array. If the method can't return ServiceWorkerRegistrations, it returns a Promise.
Implementation
Future<List<ServiceWorkerRegistration>> getRegistrations() =>
promiseToFuture<List, List<ServiceWorkerRegistration>>(
_callMethod(_delegate, 'getRegistrations', []),
(List list) => list
.map<ServiceWorkerRegistration>(
(j) => ServiceWorkerRegistration._(j as Object))
.toList());