/**
 * Type Guards
 *
 * Type Guard functions for runtime type checking
 *
 * @module utils/type-guards
 */
import type { InternalRequest, InternalResponse, InternalSocket, InternalError } from '../types/internal';
/**
 * Check InternalRequest type
 *
 * @param req - Request object
 * @returns Whether it is InternalRequest type
 *
 * @example
 * ```typescript
 * if (isInternalRequest(req)) {
 *   req.params = { id: '123' } // OK
 * }
 * ```
 */
export declare function isInternalRequest(req: any): req is InternalRequest;
/**
 * Check InternalResponse type
 *
 * @param res - Response object
 * @returns Whether it is InternalResponse type
 *
 * @example
 * ```typescript
 * if (isInternalResponse(res)) {
 *   res.req = req // OK
 * }
 * ```
 */
export declare function isInternalResponse(res: any): res is InternalResponse;
/**
 * Check InternalSocket type
 *
 * @param socket - Socket object
 * @returns Whether it is InternalSocket type
 *
 * @example
 * ```typescript
 * if (isInternalSocket(socket)) {
 *   const encrypted = socket.encrypted // OK
 * }
 * ```
 */
export declare function isInternalSocket(socket: any): socket is InternalSocket;
/**
 * Check InternalError type
 *
 * @param error - Error object
 * @returns Whether it is InternalError type
 *
 * @example
 * ```typescript
 * if (isInternalError(error)) {
 *   const code = error.code // OK
 * }
 * ```
 */
export declare function isInternalError(error: Error): error is InternalError;
/**
 * Check if Request has params field
 *
 * @param req - Request object
 * @returns Whether params field exists
 */
export declare function hasParams(req: Request): req is Request & {
    params: Record<string, string>;
};
/**
 * Check if Request has query field
 *
 * @param req - Request object
 * @returns Whether query field exists
 */
export declare function hasQuery(req: Request): req is Request & {
    query: Record<string, any>;
};
/**
 * Check if Response has req field
 *
 * @param res - Response object
 * @returns Whether req field exists
 */
export declare function hasReq(res: Response): res is Response & {
    req: Request;
};
/**
 * Check if Response has app field
 *
 * @param res - Response object
 * @returns Whether app field exists
 */
export declare function hasApp(res: Response): res is Response & {
    app: any;
};
/**
 * Check if Error has code field
 *
 * @param error - Error object
 * @returns Whether code field exists
 */
export declare function hasCode(error: Error): error is Error & {
    code: string;
};
/**
 * Check if Error has validationErrors field
 *
 * @param error - Error object
 * @returns Whether validationErrors field exists
 */
export declare function hasValidationErrors(error: Error): error is Error & {
    validationErrors: any;
};
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