/**
 * Give it a key, and it'll return the value of that header as a Uint8Array
 */
export declare const getRawHeader: (headers: Uint8Array[], key: string) => Uint8Array | undefined;
/**
 * Give it a key and value, and it'll overwrite or add the header entry
 */
export declare const setRawHeader: (headers: Uint8Array[], key: string, value: Uint8Array | string) => Uint8Array[];