/// <reference types="node" />
import { Context } from 'koa';
import { Plugin } from 'koas-core';
/**
 * A function to serialize a response body.
 *
 * @param body - The body that was set on the Koa context.
 * @param ctx - The Koa context.
 * @returns The serialized body.
 */
export declare type Serializer = (body: unknown, ctx: Context) => Buffer | string;
export interface SerializeOptions {
    /**
     * A mapping content types to serializer functions.
     *
     * The key represents a content type. An asterisk is allowed to use it for multiple similar
     * content types.
     */
    serializers?: Record<string, Serializer>;
}
/**
 * Serialize a response body based on the accept header.
 *
 * Default serializers have been registered for `application/json` and `text/*`.
 *
 * @param options - The options for serializeing the response body.
 * @returns A Koas plugin which serializes the response body bases on the accept header.
 */
export declare function serializer({ serializers }?: SerializeOptions): Plugin;