interface Request extends Object, Body {
    readonly cache: string;
    readonly credentials: string;
    readonly destination: string;
    readonly headers: Headers;
    readonly integrity: string;
    readonly keepalive: boolean;
    readonly method: string;
    readonly mode: string;
    readonly redirect: string;
    readonly referrer: string;
    readonly referrerPolicy: string;
    readonly type: string;
    readonly url: string;
    clone(): Request;
}

declare var Request: {
    prototype: Request;
    new(input: Request | string, init?: RequestInit): Request;
}

interface RequestInit {
    method?: string;
    headers?: any;
    body?: any;
    referrer?: string;
    referrerPolicy?: string;
    mode?: string;
    credentials?: string;
    cache?: string;
    redirect?: string;
    integrity?: string;
    keepalive?: boolean;
    window?: any;
}

declare class Request {
    constructor(input: RequestInfo, init?: RequestInit);

    readonly method: string;
    readonly url: string;
    readonly headers: Headers;

    readonly type: RequestType
    readonly destination: RequestDestination;
    readonly referrer: string;
    readonly referrerPolicy: ReferrerPolicy;
    readonly mode: RequestMode;
    readonly credentials: RequestCredentials;
    readonly cache: RequestCache;
    readonly redirect: RequestRedirect;
    readonly integrity: string;
    readonly keepalive: boolean;

    clone(): Request;
}
interface Request extends Body {}
interface RequestInit {
    method?: string;
    headers?: HeadersInit;
    body?: BodyInit;
    referrer?: string;
    referrerPolicy?: ReferrerPolicy;
    mode?: RequestMode;
    credentials?: RequestCredentials;
    cache?: RequestCache;
    redirect?: RequestRedirect;
    integrity?: string;
    window?: null; // can only be set to null
}

type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
type RequestDestination = "" | "document" | "embed" | "font" | "image" | "manifest" | "media" | "object" | "report" | "script" | "serviceworker" | "sharedworker" | "style" | "worker" | "xslt";
type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
type RequestCredentials = "omit" | "same-origin" | "include";
type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache" | "only-if-cached";
type RequestRedirect = "follow" | "error" | "manual";

type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "same-origin" | "origin" | "strict-origin" | "origin-when-cross-origin" | "strict-origin-when-cross-origin" | "unsafe-url";