onCall method
Declares a callable method for clients to call using a Firebase SDK. @param opts - Options to set on this function. @param handler - A function that takes a {@link https.CallableRequest}. @returns A function that you can export and deploy.
Implementation
external JSFunction onCall(
JSObject optsOrHandler, [
// (CallableRequest request) => FutureOr<dynamic>
JSFunction handler,
]);