import { NgZone } from '@angular/core';
import { messaging } from 'firebase/app';
import { Observable } from 'rxjs';
import { FirebaseAppConfig, FirebaseOptions, ɵPromiseProxy } from '@angular/fire';
export interface AngularFireMessaging extends Omit<ɵPromiseProxy<messaging.Messaging>, 'deleteToken' | 'getToken' | 'requestPermission'> {
}
export declare class AngularFireMessaging {
    readonly requestPermission: Observable<void>;
    readonly getToken: Observable<string | null>;
    readonly tokenChanges: Observable<string | null>;
    readonly messages: Observable<{}>;
    readonly requestToken: Observable<string | null>;
    readonly deleteToken: (token: string) => Observable<boolean>;
    constructor(options: FirebaseOptions, nameOrConfig: string | FirebaseAppConfig | null | undefined, platformId: Object, zone: NgZone);
}