export type Header = {
    accessControlAllowOrigin?: string;
    accessControlAllowCredentials?: string;
    accessControlExposeHeaders?: string[];
    accessControlMaxAge?: string;
    accessControlAllowMethods?: string[];
    accessControlAllowHeaders?: string[];
    acceptPatch?: string;
    acceptRanges?: string;
    age?: string;
    allow?: string[];
    altSvc?: string;
    cacheControl?: string;
    cfConnectionIp?: string;
    cfIpCountry?: string;
    connection?: string;
    contentDisposition?: string;
    contentEncoding?: string;
    contentLanguage?: string[];
    contentLength?: string;
    contentLocation?: string;
    contentMD5?: string;
    contentRange?: string;
    contentSecurityPolicy?: string;
    contentType?: string;
    date?: string;
    deltaBase?: string;
    eTag?: string;
    expires?: string;
    iM?: string;
    lastModified?: string;
    link?: string;
    location?: string;
    p3P?: string;
    pragma?: string;
    proxyAuthenticate?: string;
    publicKeyPins?: string;
    refresh?: string;
    retryAfter?: string;
    server?: string;
    setCookie?: string;
    status?: string;
    strictTransportSecurity?: string;
    timingAllowOrigin?: string[];
    trailer?: string;
    transferEncoding?: string;
    tk?: string;
    upgrade?: string[];
    vary?: string[];
    via?: string;
    warning?: string;
    wwwAuthenticate?: string;
    xContentSecurityPolicy?: string;
    xFrameOptions?: string;
    xWebkitCsp?: string;
    xContentDuration?: string;
    xContentTypeOptions?: string;
    xCorrelationId?: string;
    xMsContinuation?: string;
    xPoweredBy?: string;
    xRequestId?: string;
    xUACompatible?: string;
    xXssProtection?: string;
} & Record<string, string | string[] | undefined>;
export declare namespace Header {
    function is(value: any | Header): value is Header;
    function to(header: Header): Record<string, string | undefined>;
    function from(headers: globalThis.HeadersInit): Header;
    function toString(header: Header): string;
}