import { IUserInfo, UserProfileProps } from '../types';
/**
 * User service responsible for user document operations
 */
export declare class UserService {
    private static instance;
    private db;
    private constructor();
    static getInstance(): UserService;
    /**
     * Check if a user document exists in Firestore
     * @param userId - The ID of the user to check
     * @returns Promise<boolean> - True if user exists, false otherwise
     */
    userExists(userId: string): Promise<boolean>;
    /**
     * Create a user document if it doesn't exist
     * @param userId - The ID of the user
     * @param userData - Optional user data to store
     * @returns Promise<void>
     */
    createUserIfNotExists(userId: string, userData?: Partial<IUserInfo & Pick<UserProfileProps, 'status'>> & Record<string, unknown>): Promise<void>;
    /**
     * Get a list of all users in the users collection
     */
    getAllUsers(): Promise<IUserInfo[]>;
}
export default UserService;