/**
 * Holds configuration for how to set the `Vary` header.
 *
 * @see [MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Vary)
 * @see {@link CorsLayer.vary})
 */
export declare class Vary {
    private readonly inner;
    private constructor();
    static default(): Vary;
    static from(like: VaryLike): Vary;
    /**
     * Sets multiple headers to vary on.
     */
    static list(headers: string[]): Vary;
}
export type VaryLike = Vary | string[];