import type http from 'http';
export interface ProblemDetail {
    type: string;
    title: string;
    status: number;
    detail?: string;
    instance?: string;
}
/**
 * Send an RFC 9457 Problem Details JSON response.
 */
export declare function problemResponse(res: http.ServerResponse, status: number, title: string, detail?: string, instance?: string): void;
/** 400 Bad Request */
export declare function badRequest(res: http.ServerResponse, detail: string, instance?: string): void;
/** 404 Not Found */
export declare function notFound(res: http.ServerResponse, detail: string, instance?: string): void;
/** 405 Method Not Allowed */
export declare function methodNotAllowed(res: http.ServerResponse, allowed: string[], instance?: string): void;
/** 409 Conflict */
export declare function conflict(res: http.ServerResponse, detail: string, instance?: string): void;
/** 422 Unprocessable Entity (validation errors) */
export declare function unprocessable(res: http.ServerResponse, detail: string, instance?: string): void;
/** 500 Internal Server Error */
export declare function serverError(res: http.ServerResponse, detail?: string, instance?: string): void;
/** Send a JSON success response. */
export declare function jsonResponse(res: http.ServerResponse, status: number, data: unknown): void;
/** Read the request body as a string. */
export declare function readBody(req: http.IncomingMessage): Promise<string>;
/** Parse JSON body, returning null on failure. */
export declare function parseJsonBody(req: http.IncomingMessage): Promise<Record<string, unknown> | null>;
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