import type Soup from '@girs/soup-3.0';
declare const _headers: unique symbol;
export default class Headers implements Iterable<[string, string]> {
    [_headers]: Map<string, string[]>;
    constructor(init?: HeadersInit | Headers | null);
    append(name: string, value: string): void;
    set(name: string, value: string): void;
    delete(name: string): void;
    has(name: string): boolean;
    get(name: string): string | null;
    getAll(name: string): string[];
    getSetCookie(): string[];
    forEach(callback: (value: string, name: string, parent: Headers) => void, thisArg?: unknown): void;
    keys(): IterableIterator<string>;
    values(): IterableIterator<string>;
    entries(): IterableIterator<[string, string]>;
    [Symbol.iterator](): IterableIterator<[string, string]>;
    get [Symbol.toStringTag](): string;
    toString(): string;
    /**
     * Node-fetch non-spec method: return all headers and their values as arrays.
     */
    raw(): Record<string, string[]>;
    /**
     * Append all headers to a Soup.Message for sending.
     *
     * `soup` is the lazily-loaded Soup namespace (see utils/soup-lazy.ts); it is
     * passed in rather than statically imported so this module does not link the
     * `gi://Soup` typelib at import time.
     */
    _appendToSoupMessage(soup: typeof Soup, message?: Soup.Message, type?: Soup.MessageHeadersType): Soup.MessageHeaders;
    /**
     * Create a Headers instance from a Soup.Message's headers.
     */
    static _newFromSoupMessage(soup: typeof Soup, message: Soup.Message, type?: Soup.MessageHeadersType): Headers;
}
export {};