import type { AppOptions, RequestContext } from "../types/index.js";
/**
 * Handle 500 Internal Server Error responses.
 * Uses custom onError handler if provided, otherwise returns default JSON response.
 *
 * In production (`NODE_ENV=production`), the default handler returns a generic
 * "Internal Server Error" message to avoid leaking sensitive information.
 * In development and test, the full error message is included.
 */
export declare function handleError(ctx: RequestContext, error: unknown, options?: AppOptions): Promise<Response>;
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