import { Version } from '@angular/core';
import { FirebaseApp } from 'firebase/app';
export declare const VERSION: Version;
export declare const ɵisSupportedError: (module: string) => string;
export declare function ɵgetDefaultInstanceOf<T = unknown>(identifier: string, provided: T[] | undefined, defaultApp: FirebaseApp): T | undefined;
export declare const ɵgetAllInstancesOf: <T = unknown>(identifier: string, app?: FirebaseApp) => T[];