import type { NanotronClientRequest } from '@alwatr/nanotron-api-server';
import type { JsonObject, JsonArray } from '@alwatr/type-helper';
/**
 * Middleware to parses the request body as JSON and assigns it to `this.sharedMeta.body`.
 * If the body is empty or invalid, it sends an error response,
 * which triggers `terminatedHandlers` and prevents further handlers from executing.
 *
 * @this {NanotronClientRequest<{body: DictionaryOpt}>}
 * @returns {Promise<void>} A promise that resolves when the body is successfully parsed or an error response is sent.
 *
 * @example
 * ```ts
 * nanotronApiServer.defineRoute<{body: DictionaryOpt}>({
 *   preHandlers: [parseBodyAsJson],
 *   async handler() {
 *     const body = this.sharedMeta.body; // json object
 *   },
 * });
 * ```
 */
export declare function parseBodyAsJson(this: NanotronClientRequest<{
    body?: JsonObject | JsonArray;
}>): Promise<void>;
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