/**
 * Firebase Client — singleton initialization and auth helpers.
 */
import { type FirebaseApp } from 'firebase/app';
import { type Auth, type User, type UserCredential, type AuthProvider } from 'firebase/auth';
interface FirebaseConfig {
    apiKey?: string;
    authDomain?: string;
    projectId?: string;
    storageBucket?: string;
    messagingSenderId?: string;
    appId?: string;
    measurementId?: string;
}
export declare function initializeFirebase(config: FirebaseConfig): FirebaseApp;
export declare function getFirebaseApp(): FirebaseApp;
export declare function getFirebaseAuth(): Auth;
export declare function signIn(email: string, password: string): Promise<UserCredential>;
export declare function signUp(email: string, password: string): Promise<UserCredential>;
export declare function signInAnonymously(): Promise<UserCredential>;
export declare function upgradeAnonymousAccount(email: string, password: string): Promise<UserCredential>;
export declare function upgradeAnonymousWithPopup(provider: AuthProvider): Promise<UserCredential>;
export declare function resetPassword(email: string): Promise<void>;
export declare function logout(): Promise<void>;
export declare function onAuthChange(callback: (user: User | null) => void): () => void;
export declare function getCurrentUser(): Promise<User | null>;
export declare function getIdToken(): Promise<string | null>;
export type { User, UserCredential, Auth };
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