import { Context, Next } from 'koa';
export interface CorsOptions {
    origin?: string | string[] | ((ctx: Context) => string);
    exposeHeaders?: string[];
    maxAge?: number;
    credentials?: boolean;
    allowMethods?: string[];
    allowHeaders?: string[];
}
declare function crossOrigin(options?: CorsOptions): (ctx: Context, next: Next) => Promise<any>;
export default crossOrigin;