export declare class HeadersImpl implements Omit<Headers, "values" | "keys" | "entries" | typeof Symbol.iterator | "forEach"> {
    readonly impl: Headers;
    constructor(init: Map<string, string | string[]>);
    forEach(callbackfn: (value: string, key: string, parent: this) => void): void;
    delete(name: string): void;
    get(name: string): string | null;
    getSetCookie(): string[];
    has(name: string): boolean;
    set(name: string, value: string): void;
    [Symbol.iterator](): Iterable<[string, string]>;
    entries(): Iterable<[string, string]>;
    keys(): Iterable<string>;
    values(): Iterable<string>;
    append(key: string, value?: string | string[]): HeadersImpl;
}
export interface HeaderForeach {
    forEach(callbackfn: (value: string | string[], key: string, parent: this) => void): void;
}
export type CoercedHeadersInit = HeadersInit | HeaderForeach | HttpHeader;
export declare class HttpHeader {
    readonly _headers: Map<string, Set<string>>;
    static coerce(headers: CoercedHeadersInit): HttpHeader;
    static from(...headersArgs: CoercedHeadersInit[]): HttpHeader;
    _asStringString(): Map<string, string>;
    _key(key: string): string;
    Values(key: string): string[];
    Get(key: string): string | undefined;
    Set(key: string, valueOr: string | string[]): HttpHeader;
    Add(key: string, value: string | string[] | undefined): HttpHeader;
    Del(ey: string): HttpHeader;
    Items(): [string, string[]][];
    SortItems(): [string, string[]][];
    Clone(): HttpHeader;
    AsRecordStringStringArray(): Record<string, string[]>;
    AsRecordStringString(): Record<string, string>;
    AsHeaderInit<H extends HeadersInit>(): H;
    AsHeaders(): HeadersImpl;
    MergeInplace(...other: CoercedHeadersInit[]): HttpHeader;
    Merge(...other: CoercedHeadersInit[]): HttpHeader;
}
//# sourceMappingURL=http_header.d.ts.map