/**
 * Security utilities for the Firebase chat library
 */
/**
 * Validates user input to prevent XSS and injection attacks
 */
export declare const sanitizeUserInput: (input: string) => string;
/**
 * Validates file paths to prevent directory traversal
 */
export declare const validateFilePath: (filePath: string) => boolean;
/**
 * Validates encryption key strength
 */
export declare const validateEncryptionKey: (key: string) => {
    isValid: boolean;
    errors: string[];
};
/**
 * Validates message content
 */
export declare const validateMessage: (message: string) => {
    isValid: boolean;
    errors: string[];
};
/**
 * Validates user ID format
 */
export declare const validateUserId: (userId: string) => boolean;
/**
 * Rate limiting helper
 */
export declare class RateLimiter {
    private attempts;
    private readonly maxAttempts;
    private readonly windowMs;
    constructor(maxAttempts?: number, windowMs?: number);
    isAllowed(identifier: string): boolean;
    reset(identifier: string): void;
}
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