export interface UserAccount {
    email: string;
    userId: string;
    provider: 'email' | 'google';
    token?: string;
    loggedInAt: string;
}
export interface StoredAccount {
    email: string;
    userId: string;
    passwordHash?: string;
    salt?: string;
    provider: 'email' | 'google';
    createdAt: string;
}
export declare class AuthManager {
    private static getAuthFilePath;
    private static getAccountsFilePath;
    private static loadAccounts;
    private static saveAccounts;
    private static hashPassword;
    static getCurrentUser(): UserAccount | null;
    static isAuthenticated(): boolean;
    static generateUserId(email: string): string;
    /**
     * Password-based Registration or Login
     * - If account does not exist: creates account with hashed password
     * - If account exists: verifies password against stored PBKDF2 hash
     */
    static loginWithPassword(email: string, password?: string): Promise<{
        success: boolean;
        user?: UserAccount;
        error?: string;
    }>;
    static register(email: string, password?: string): Promise<{
        success: boolean;
        user?: UserAccount;
        error?: string;
    }>;
    static login(email: string, password?: string): Promise<{
        success: boolean;
        user?: UserAccount;
        error?: string;
    }>;
    /**
     * Google Sign-In handler (processes verified Google OAuth token or Google account identity)
     */
    static loginWithGoogle(email: string, googleToken?: string): Promise<{
        success: boolean;
        user?: UserAccount;
        error?: string;
    }>;
    static logout(): void;
}
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