import { ctx as Context } from "../core/router.js";
export type CorsOptions = {
    origin?: string | RegExp | (string | RegExp)[] | ((reqOrigin: string) => boolean);
    methods?: string[];
    allowedHeaders?: string[];
    exposedHeaders?: string[];
    credentials?: boolean;
    maxAge?: number;
};
export declare function cors(option?: CorsOptions): (ctx: Context, next: () => Promise<any>) => Promise<any>;