export declare const FIREBASE_AUDIENCE = "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit";
export declare const CLIENT_CERT_URL = "https://www.googleapis.com/robot/v1/metadata/x509/securetoken@system.gserviceaccount.com";
export declare function emulatorHost(): string | undefined;
export declare function useEmulator(): boolean;