/**
 * @see https://github.com/expressjs/cors
 */
export declare type CustomOrigin = (requestOrigin: string, callback: (err: Error | null, allow?: boolean) => void) => void;
export interface CorsOptions {
    origin?: boolean | string | RegExp | (string | RegExp)[] | CustomOrigin;
    methods?: string | string[];
    allowedHeaders?: string | string[];
    exposedHeaders?: string | string[];
    credentials?: boolean;
    maxAge?: number;
    preflightContinue?: boolean;
    optionsSuccessStatus?: number;
}