Added a very complicated AsyncIterableReader class.

The class was already implemented in
"https://deno.land/std@0.144.0/streams/conversion.ts".  So, I litterally
lost 1 day of work!  I hate myself.

vendor/deno.land/std@0.144.0/io/types.d.ts

@@ -0,0 +1,82 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+export interface Reader {
+  /** Reads up to `p.byteLength` bytes into `p`. It resolves to the number of
+   * bytes read (`0` < `n` <= `p.byteLength`) and rejects if any error
+   * encountered. Even if `read()` resolves to `n` < `p.byteLength`, it may
+   * use all of `p` as scratch space during the call. If some data is
+   * available but not `p.byteLength` bytes, `read()` conventionally resolves
+   * to what is available instead of waiting for more.
+   *
+   * When `read()` encounters end-of-file condition, it resolves to EOF
+   * (`null`).
+   *
+   * When `read()` encounters an error, it rejects with an error.
+   *
+   * Callers should always process the `n` > `0` bytes returned before
+   * considering the EOF (`null`). Doing so correctly handles I/O errors that
+   * happen after reading some bytes and also both of the allowed EOF
+   * behaviors.
+   *
+   * Implementations should not retain a reference to `p`.
+   *
+   * Use iterateReader() from https://deno.land/std/streams/conversion.ts to turn a Reader into an
+   * AsyncIterator.
+   */
+  read(p: Uint8Array): Promise<number | null>;
+}
+
+export interface ReaderSync {
+  /** Reads up to `p.byteLength` bytes into `p`. It resolves to the number
+   * of bytes read (`0` < `n` <= `p.byteLength`) and rejects if any error
+   * encountered. Even if `read()` returns `n` < `p.byteLength`, it may use
+   * all of `p` as scratch space during the call. If some data is available
+   * but not `p.byteLength` bytes, `read()` conventionally returns what is
+   * available instead of waiting for more.
+   *
+   * When `readSync()` encounters end-of-file condition, it returns EOF
+   * (`null`).
+   *
+   * When `readSync()` encounters an error, it throws with an error.
+   *
+   * Callers should always process the `n` > `0` bytes returned before
+   * considering the EOF (`null`). Doing so correctly handles I/O errors that happen
+   * after reading some bytes and also both of the allowed EOF behaviors.
+   *
+   * Implementations should not retain a reference to `p`.
+   *
+   * Use iterateReaderSync() from https://deno.land/std/streams/conversion.ts to turn a ReaderSync
+   * into an Iterator.
+   */
+  readSync(p: Uint8Array): number | null;
+}
+
+export interface Writer {
+  /** Writes `p.byteLength` bytes from `p` to the underlying data stream. It
+   * resolves to the number of bytes written from `p` (`0` <= `n` <=
+   * `p.byteLength`) or reject with the error encountered that caused the
+   * write to stop early. `write()` must reject with a non-null error if
+   * would resolve to `n` < `p.byteLength`. `write()` must not modify the
+   * slice data, even temporarily.
+   *
+   * Implementations should not retain a reference to `p`.
+   */
+  write(p: Uint8Array): Promise<number>;
+}
+
+export interface WriterSync {
+  /** Writes `p.byteLength` bytes from `p` to the underlying data
+   * stream. It returns the number of bytes written from `p` (`0` <= `n`
+   * <= `p.byteLength`) and any error encountered that caused the write to
+   * stop early. `writeSync()` must throw a non-null error if it returns `n` <
+   * `p.byteLength`. `writeSync()` must not modify the slice data, even
+   * temporarily.
+   *
+   * Implementations should not retain a reference to `p`.
+   */
+  writeSync(p: Uint8Array): number;
+}
+
+export interface Closer {
+  close(): void;
+}