/**
 * Input validation and security utilities
 */
/**
 * Validate URL is HTTPS and from qwen.ai domain
 */
export declare function validateQwenUrl(url: string): boolean;
/**
 * Validate device code format
 */
export declare function validateDeviceCode(code: string): void;
/**
 * Validate user code format
 */
export declare function validateUserCode(code: string): void;
/**
 * Validate access token format
 */
export declare function validateToken(token: string): void;
/**
 * Validate token type (per RFC 6749)
 */
export declare function validateTokenType(tokenType: string): void;
/**
 * Validate expires_in value (optional field)
 * Returns a default value if invalid or missing
 */
export declare function validateExpiresIn(expiresIn: number | undefined, defaultValue?: number): number;
/**
 * Validate interval for polling (optional field)
 * Returns a default value if invalid or missing
 */
export declare function validateInterval(interval: number | undefined, defaultValue?: number): number;
/**
 * Sanitize log data by removing sensitive fields
 */
export declare function sanitizeLogData(data: any): any;
/**
 * Validate OAuth error response
 * Returns a safe error object even if the response is malformed
 */
export declare function validateOAuthError(error: any): {
    error: string;
    error_description?: string;
};
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