type NextHeaders = {
    get: (name: string) => string | null;
    has: (name: string) => boolean;
    entries: () => IterableIterator<[string, string]>;
    keys: () => IterableIterator<string>;
    values: () => IterableIterator<string>;
    forEach: (callbackfn: (value: string, key: string, parent: NextHeaders) => void) => void;
};
type Headers = NextHeaders | undefined;
export declare const useNextHeaders: () => Headers;
export {};