/**
 * Lightweight request body validation for HTTP routes.
 * Prefer these helpers over `JSON.parse(...) as { field?: string }` for new code.
 *
 * Secondary-dev checklist:
 * 1. readJsonBody(req)
 * 2. requireString / requireEnum / optionalString
 * 3. throw YskError → sendError (or let outer catch)
 */
import type { IncomingMessage } from 'node:http';
export type JsonObject = Record<string, unknown>;
/** Parse JSON body; empty body → {}. Invalid JSON → 400. */
export declare function readJsonBody(req: IncomingMessage): Promise<JsonObject>;
export declare function requireString(data: JsonObject, key: string, opts?: {
    min?: number;
    max?: number;
    trim?: boolean;
}): string;
export declare function optionalString(data: JsonObject, key: string, opts?: {
    max?: number;
}): string | undefined;
export declare function requireEnum<T extends string>(data: JsonObject, key: string, allowed: readonly T[]): T;
export declare function optionalBoolean(data: JsonObject, key: string): boolean | undefined;
export declare function optionalNumber(data: JsonObject, key: string, opts?: {
    min?: number;
    max?: number;
}): number | undefined;
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