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diff --git a/op_crates/fetch/lib.deno_fetch.d.ts b/op_crates/fetch/lib.deno_fetch.d.ts
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+++ b/op_crates/fetch/lib.deno_fetch.d.ts
@@ -0,0 +1,636 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, no-var */
+
+/// <reference no-default-lib="true" />
+/// <reference lib="esnext" />
+
+interface DomIterable<K, V> {
+  keys(): IterableIterator<K>;
+  values(): IterableIterator<V>;
+  entries(): IterableIterator<[K, V]>;
+  [Symbol.iterator](): IterableIterator<[K, V]>;
+  forEach(
+    callback: (value: V, key: K, parent: this) => void,
+    thisArg?: any,
+  ): void;
+}
+
+interface ReadableStreamReadDoneResult<T> {
+  done: true;
+  value?: T;
+}
+
+interface ReadableStreamReadValueResult<T> {
+  done: false;
+  value: T;
+}
+
+type ReadableStreamReadResult<T> =
+  | ReadableStreamReadValueResult<T>
+  | ReadableStreamReadDoneResult<T>;
+
+interface ReadableStreamDefaultReader<R = any> {
+  readonly closed: Promise<void>;
+  cancel(reason?: any): Promise<void>;
+  read(): Promise<ReadableStreamReadResult<R>>;
+  releaseLock(): void;
+}
+
+interface ReadableStreamReader<R = any> {
+  cancel(): Promise<void>;
+  read(): Promise<ReadableStreamReadResult<R>>;
+  releaseLock(): void;
+}
+
+interface ReadableByteStreamControllerCallback {
+  (controller: ReadableByteStreamController): void | PromiseLike<void>;
+}
+
+interface UnderlyingByteSource {
+  autoAllocateChunkSize?: number;
+  cancel?: ReadableStreamErrorCallback;
+  pull?: ReadableByteStreamControllerCallback;
+  start?: ReadableByteStreamControllerCallback;
+  type: "bytes";
+}
+
+interface UnderlyingSource<R = any> {
+  cancel?: ReadableStreamErrorCallback;
+  pull?: ReadableStreamDefaultControllerCallback<R>;
+  start?: ReadableStreamDefaultControllerCallback<R>;
+  type?: undefined;
+}
+
+interface ReadableStreamErrorCallback {
+  (reason: any): void | PromiseLike<void>;
+}
+
+interface ReadableStreamDefaultControllerCallback<R> {
+  (controller: ReadableStreamDefaultController<R>): void | PromiseLike<void>;
+}
+
+interface ReadableStreamDefaultController<R = any> {
+  readonly desiredSize: number | null;
+  close(): void;
+  enqueue(chunk: R): void;
+  error(error?: any): void;
+}
+
+interface ReadableByteStreamController {
+  readonly byobRequest: undefined;
+  readonly desiredSize: number | null;
+  close(): void;
+  enqueue(chunk: ArrayBufferView): void;
+  error(error?: any): void;
+}
+
+interface PipeOptions {
+  preventAbort?: boolean;
+  preventCancel?: boolean;
+  preventClose?: boolean;
+  signal?: AbortSignal;
+}
+
+interface QueuingStrategySizeCallback<T = any> {
+  (chunk: T): number;
+}
+
+interface QueuingStrategy<T = any> {
+  highWaterMark?: number;
+  size?: QueuingStrategySizeCallback<T>;
+}
+
+/** This Streams API interface provides a built-in byte length queuing strategy
+   * that can be used when constructing streams. */
+declare class CountQueuingStrategy implements QueuingStrategy {
+  constructor(options: { highWaterMark: number });
+  highWaterMark: number;
+  size(chunk: any): 1;
+}
+
+declare class ByteLengthQueuingStrategy
+  implements QueuingStrategy<ArrayBufferView> {
+  constructor(options: { highWaterMark: number });
+  highWaterMark: number;
+  size(chunk: ArrayBufferView): number;
+}
+
+/** This Streams API interface represents a readable stream of byte data. The
+   * Fetch API offers a concrete instance of a ReadableStream through the body
+   * property of a Response object. */
+interface ReadableStream<R = any> {
+  readonly locked: boolean;
+  cancel(reason?: any): Promise<void>;
+  getIterator(options?: { preventCancel?: boolean }): AsyncIterableIterator<R>;
+  // getReader(options: { mode: "byob" }): ReadableStreamBYOBReader;
+  getReader(): ReadableStreamDefaultReader<R>;
+  pipeThrough<T>(
+    {
+      writable,
+      readable,
+    }: {
+      writable: WritableStream<R>;
+      readable: ReadableStream<T>;
+    },
+    options?: PipeOptions,
+  ): ReadableStream<T>;
+  pipeTo(dest: WritableStream<R>, options?: PipeOptions): Promise<void>;
+  tee(): [ReadableStream<R>, ReadableStream<R>];
+  [Symbol.asyncIterator](options?: {
+    preventCancel?: boolean;
+  }): AsyncIterableIterator<R>;
+}
+
+declare var ReadableStream: {
+  prototype: ReadableStream;
+  new (
+    underlyingSource: UnderlyingByteSource,
+    strategy?: { highWaterMark?: number; size?: undefined },
+  ): ReadableStream<Uint8Array>;
+  new <R = any>(
+    underlyingSource?: UnderlyingSource<R>,
+    strategy?: QueuingStrategy<R>,
+  ): ReadableStream<R>;
+};
+
+interface WritableStreamDefaultControllerCloseCallback {
+  (): void | PromiseLike<void>;
+}
+
+interface WritableStreamDefaultControllerStartCallback {
+  (controller: WritableStreamDefaultController): void | PromiseLike<void>;
+}
+
+interface WritableStreamDefaultControllerWriteCallback<W> {
+  (chunk: W, controller: WritableStreamDefaultController):
+    | void
+    | PromiseLike<
+      void
+    >;
+}
+
+interface WritableStreamErrorCallback {
+  (reason: any): void | PromiseLike<void>;
+}
+
+interface UnderlyingSink<W = any> {
+  abort?: WritableStreamErrorCallback;
+  close?: WritableStreamDefaultControllerCloseCallback;
+  start?: WritableStreamDefaultControllerStartCallback;
+  type?: undefined;
+  write?: WritableStreamDefaultControllerWriteCallback<W>;
+}
+
+/** This Streams API interface provides a standard abstraction for writing
+   * streaming data to a destination, known as a sink. This object comes with
+   * built-in backpressure and queuing. */
+declare class WritableStream<W = any> {
+  constructor(
+    underlyingSink?: UnderlyingSink<W>,
+    strategy?: QueuingStrategy<W>,
+  );
+  readonly locked: boolean;
+  abort(reason?: any): Promise<void>;
+  close(): Promise<void>;
+  getWriter(): WritableStreamDefaultWriter<W>;
+}
+
+/** This Streams API interface represents a controller allowing control of a
+   * WritableStream's state. When constructing a WritableStream, the underlying
+   * sink is given a corresponding WritableStreamDefaultController instance to
+   * manipulate. */
+interface WritableStreamDefaultController {
+  error(error?: any): void;
+}
+
+/** This Streams API interface is the object returned by
+   * WritableStream.getWriter() and once created locks the < writer to the
+   * WritableStream ensuring that no other streams can write to the underlying
+   * sink. */
+interface WritableStreamDefaultWriter<W = any> {
+  readonly closed: Promise<void>;
+  readonly desiredSize: number | null;
+  readonly ready: Promise<void>;
+  abort(reason?: any): Promise<void>;
+  close(): Promise<void>;
+  releaseLock(): void;
+  write(chunk: W): Promise<void>;
+}
+
+declare class TransformStream<I = any, O = any> {
+  constructor(
+    transformer?: Transformer<I, O>,
+    writableStrategy?: QueuingStrategy<I>,
+    readableStrategy?: QueuingStrategy<O>,
+  );
+  readonly readable: ReadableStream<O>;
+  readonly writable: WritableStream<I>;
+}
+
+interface TransformStreamDefaultController<O = any> {
+  readonly desiredSize: number | null;
+  enqueue(chunk: O): void;
+  error(reason?: any): void;
+  terminate(): void;
+}
+
+interface Transformer<I = any, O = any> {
+  flush?: TransformStreamDefaultControllerCallback<O>;
+  readableType?: undefined;
+  start?: TransformStreamDefaultControllerCallback<O>;
+  transform?: TransformStreamDefaultControllerTransformCallback<I, O>;
+  writableType?: undefined;
+}
+
+interface TransformStreamDefaultControllerCallback<O> {
+  (controller: TransformStreamDefaultController<O>): void | PromiseLike<void>;
+}
+
+interface TransformStreamDefaultControllerTransformCallback<I, O> {
+  (
+    chunk: I,
+    controller: TransformStreamDefaultController<O>,
+  ): void | PromiseLike<void>;
+}
+
+type BlobPart = BufferSource | Blob | string;
+
+interface BlobPropertyBag {
+  type?: string;
+  ending?: "transparent" | "native";
+}
+
+/** A file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system. */
+interface Blob {
+  readonly size: number;
+  readonly type: string;
+  arrayBuffer(): Promise<ArrayBuffer>;
+  slice(start?: number, end?: number, contentType?: string): Blob;
+  stream(): ReadableStream;
+  text(): Promise<string>;
+}
+
+declare const Blob: {
+  prototype: Blob;
+  new (blobParts?: BlobPart[], options?: BlobPropertyBag): Blob;
+};
+
+interface FilePropertyBag extends BlobPropertyBag {
+  lastModified?: number;
+}
+
+/** Provides information about files and allows JavaScript in a web page to
+   * access their content. */
+interface File extends Blob {
+  readonly lastModified: number;
+  readonly name: string;
+}
+
+declare const File: {
+  prototype: File;
+  new (fileBits: BlobPart[], fileName: string, options?: FilePropertyBag): File;
+};
+
+type FormDataEntryValue = File | string;
+
+/** Provides a way to easily construct a set of key/value pairs representing
+ * form fields and their values, which can then be easily sent using the
+ * XMLHttpRequest.send() method. It uses the same format a form would use if the
+ * encoding type were set to "multipart/form-data". */
+interface FormData extends DomIterable<string, FormDataEntryValue> {
+  append(name: string, value: string | Blob, fileName?: string): void;
+  delete(name: string): void;
+  get(name: string): FormDataEntryValue | null;
+  getAll(name: string): FormDataEntryValue[];
+  has(name: string): boolean;
+  set(name: string, value: string | Blob, fileName?: string): void;
+}
+
+declare const FormData: {
+  prototype: FormData;
+  // TODO(ry) FormData constructor is non-standard.
+  // new(form?: HTMLFormElement): FormData;
+  new (): FormData;
+};
+
+interface Body {
+  /** A simple getter used to expose a `ReadableStream` of the body contents. */
+  readonly body: ReadableStream<Uint8Array> | null;
+  /** Stores a `Boolean` that declares whether the body has been used in a
+   * response yet.
+   */
+  readonly bodyUsed: boolean;
+  /** Takes a `Response` stream and reads it to completion. It returns a promise
+   * that resolves with an `ArrayBuffer`.
+   */
+  arrayBuffer(): Promise<ArrayBuffer>;
+  /** Takes a `Response` stream and reads it to completion. It returns a promise
+   * that resolves with a `Blob`.
+   */
+  blob(): Promise<Blob>;
+  /** Takes a `Response` stream and reads it to completion. It returns a promise
+   * that resolves with a `FormData` object.
+   */
+  formData(): Promise<FormData>;
+  /** Takes a `Response` stream and reads it to completion. It returns a promise
+   * that resolves with the result of parsing the body text as JSON.
+   */
+  json(): Promise<any>;
+  /** Takes a `Response` stream and reads it to completion. It returns a promise
+   * that resolves with a `USVString` (text).
+   */
+  text(): Promise<string>;
+}
+
+type HeadersInit = Headers | string[][] | Record<string, string>;
+
+/** This Fetch API interface allows you to perform various actions on HTTP
+ * request and response headers. These actions include retrieving, setting,
+ * adding to, and removing. A Headers object has an associated header list,
+ * which is initially empty and consists of zero or more name and value pairs.
+ *  You can add to this using methods like append() (see Examples.) In all
+ * methods of this interface, header names are matched by case-insensitive byte
+ * sequence. */
+interface Headers {
+  append(name: string, value: string): void;
+  delete(name: string): void;
+  get(name: string): string | null;
+  has(name: string): boolean;
+  set(name: string, value: string): void;
+  forEach(
+    callbackfn: (value: string, key: string, parent: Headers) => void,
+    thisArg?: any,
+  ): void;
+}
+
+interface Headers extends DomIterable<string, string> {
+  /** Appends a new value onto an existing header inside a `Headers` object, or
+   * adds the header if it does not already exist.
+   */
+  append(name: string, value: string): void;
+  /** Deletes a header from a `Headers` object. */
+  delete(name: string): void;
+  /** Returns an iterator allowing to go through all key/value pairs
+   * contained in this Headers object. The both the key and value of each pairs
+   * are ByteString objects.
+   */
+  entries(): IterableIterator<[string, string]>;
+  /** Returns a `ByteString` sequence of all the values of a header within a
+   * `Headers` object with a given name.
+   */
+  get(name: string): string | null;
+  /** Returns a boolean stating whether a `Headers` object contains a certain
+   * header.
+   */
+  has(name: string): boolean;
+  /** Returns an iterator allowing to go through all keys contained in
+   * this Headers object. The keys are ByteString objects.
+   */
+  keys(): IterableIterator<string>;
+  /** Sets a new value for an existing header inside a Headers object, or adds
+   * the header if it does not already exist.
+   */
+  set(name: string, value: string): void;
+  /** Returns an iterator allowing to go through all values contained in
+   * this Headers object. The values are ByteString objects.
+   */
+  values(): IterableIterator<string>;
+  forEach(
+    callbackfn: (value: string, key: string, parent: this) => void,
+    thisArg?: any,
+  ): void;
+  /** The Symbol.iterator well-known symbol specifies the default
+   * iterator for this Headers object
+   */
+  [Symbol.iterator](): IterableIterator<[string, string]>;
+}
+
+declare const Headers: {
+  prototype: Headers;
+  new (init?: HeadersInit): Headers;
+};
+
+type RequestInfo = Request | string;
+type RequestCache =
+  | "default"
+  | "force-cache"
+  | "no-cache"
+  | "no-store"
+  | "only-if-cached"
+  | "reload";
+type RequestCredentials = "include" | "omit" | "same-origin";
+type RequestMode = "cors" | "navigate" | "no-cors" | "same-origin";
+type RequestRedirect = "error" | "follow" | "manual";
+type ReferrerPolicy =
+  | ""
+  | "no-referrer"
+  | "no-referrer-when-downgrade"
+  | "origin"
+  | "origin-when-cross-origin"
+  | "same-origin"
+  | "strict-origin"
+  | "strict-origin-when-cross-origin"
+  | "unsafe-url";
+type BodyInit =
+  | Blob
+  | BufferSource
+  | FormData
+  | URLSearchParams
+  | ReadableStream<Uint8Array>
+  | string;
+type RequestDestination =
+  | ""
+  | "audio"
+  | "audioworklet"
+  | "document"
+  | "embed"
+  | "font"
+  | "image"
+  | "manifest"
+  | "object"
+  | "paintworklet"
+  | "report"
+  | "script"
+  | "sharedworker"
+  | "style"
+  | "track"
+  | "video"
+  | "worker"
+  | "xslt";
+
+interface RequestInit {
+  /**
+   * A BodyInit object or null to set request's body.
+   */
+  body?: BodyInit | null;
+  /**
+   * A string indicating how the request will interact with the browser's cache
+   * to set request's cache.
+   */
+  cache?: RequestCache;
+  /**
+   * A string indicating whether credentials will be sent with the request
+   * always, never, or only when sent to a same-origin URL. Sets request's
+   * credentials.
+   */
+  credentials?: RequestCredentials;
+  /**
+   * A Headers object, an object literal, or an array of two-item arrays to set
+   * request's headers.
+   */
+  headers?: HeadersInit;
+  /**
+   * A cryptographic hash of the resource to be fetched by request. Sets
+   * request's integrity.
+   */
+  integrity?: string;
+  /**
+   * A boolean to set request's keepalive.
+   */
+  keepalive?: boolean;
+  /**
+   * A string to set request's method.
+   */
+  method?: string;
+  /**
+   * A string to indicate whether the request will use CORS, or will be
+   * restricted to same-origin URLs. Sets request's mode.
+   */
+  mode?: RequestMode;
+  /**
+   * A string indicating whether request follows redirects, results in an error
+   * upon encountering a redirect, or returns the redirect (in an opaque
+   * fashion). Sets request's redirect.
+   */
+  redirect?: RequestRedirect;
+  /**
+   * A string whose value is a same-origin URL, "about:client", or the empty
+   * string, to set request's referrer.
+   */
+  referrer?: string;
+  /**
+   * A referrer policy to set request's referrerPolicy.
+   */
+  referrerPolicy?: ReferrerPolicy;
+  /**
+   * An AbortSignal to set request's signal.
+   */
+  signal?: AbortSignal | null;
+  /**
+   * Can only be null. Used to disassociate request from any Window.
+   */
+  window?: any;
+}
+
+/** This Fetch API interface represents a resource request. */
+interface Request extends Body {
+  /**
+   * Returns the cache mode associated with request, which is a string
+   * indicating how the request will interact with the browser's cache when
+   * fetching.
+   */
+  readonly cache: RequestCache;
+  /**
+   * Returns the credentials mode associated with request, which is a string
+   * indicating whether credentials will be sent with the request always, never,
+   * or only when sent to a same-origin URL.
+   */
+  readonly credentials: RequestCredentials;
+  /**
+   * Returns the kind of resource requested by request, e.g., "document" or "script".
+   */
+  readonly destination: RequestDestination;
+  /**
+   * Returns a Headers object consisting of the headers associated with request.
+   * Note that headers added in the network layer by the user agent will not be
+   * accounted for in this object, e.g., the "Host" header.
+   */
+  readonly headers: Headers;
+  /**
+   * Returns request's subresource integrity metadata, which is a cryptographic
+   * hash of the resource being fetched. Its value consists of multiple hashes
+   * separated by whitespace. [SRI]
+   */
+  readonly integrity: string;
+  /**
+   * Returns a boolean indicating whether or not request is for a history
+   * navigation (a.k.a. back-forward navigation).
+   */
+  readonly isHistoryNavigation: boolean;
+  /**
+   * Returns a boolean indicating whether or not request is for a reload
+   * navigation.
+   */
+  readonly isReloadNavigation: boolean;
+  /**
+   * Returns a boolean indicating whether or not request can outlive the global
+   * in which it was created.
+   */
+  readonly keepalive: boolean;
+  /**
+   * Returns request's HTTP method, which is "GET" by default.
+   */
+  readonly method: string;
+  /**
+   * Returns the mode associated with request, which is a string indicating
+   * whether the request will use CORS, or will be restricted to same-origin
+   * URLs.
+   */
+  readonly mode: RequestMode;
+  /**
+   * Returns the redirect mode associated with request, which is a string
+   * indicating how redirects for the request will be handled during fetching. A
+   * request will follow redirects by default.
+   */
+  readonly redirect: RequestRedirect;
+  /**
+   * Returns the referrer of request. Its value can be a same-origin URL if
+   * explicitly set in init, the empty string to indicate no referrer, and
+   * "about:client" when defaulting to the global's default. This is used during
+   * fetching to determine the value of the `Referer` header of the request
+   * being made.
+   */
+  readonly referrer: string;
+  /**
+   * Returns the referrer policy associated with request. This is used during
+   * fetching to compute the value of the request's referrer.
+   */
+  readonly referrerPolicy: ReferrerPolicy;
+  /**
+   * Returns the signal associated with request, which is an AbortSignal object
+   * indicating whether or not request has been aborted, and its abort event
+   * handler.
+   */
+  readonly signal: AbortSignal;
+  /**
+   * Returns the URL of request as a string.
+   */
+  readonly url: string;
+  clone(): Request;
+}
+
+declare const Request: {
+  prototype: Request;
+  new (input: RequestInfo, init?: RequestInit): Request;
+};
+
+declare const Response: {
+  prototype: Response;
+  new (body?: BodyInit | null, init?: ResponseInit): Response;
+  error(): Response;
+  redirect(url: string, status?: number): Response;
+};
+
+/** Fetch a resource from the network. It returns a Promise that resolves to the
+   * Response to that request, whether it is successful or not.
+   *
+   *     const response = await fetch("http://my.json.host/data.json");
+   *     console.log(response.status);  // e.g. 200
+   *     console.log(response.statusText); // e.g. "OK"
+   *     const jsonData = await response.json();
+   */
+declare function fetch(
+  input: Request | URL | string,
+  init?: RequestInit,
+): Promise<Response>;