Started to implement server

vendor/deno.land/std@0.178.0/streams/writable_stream_from_writer.ts

@@ -0,0 +1,51 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import { writeAll } from "./write_all.ts";
+import type { Closer, Writer } from "../types.d.ts";
+
+function isCloser(value: unknown): value is Closer {
+  return typeof value === "object" && value != null && "close" in value &&
+    // deno-lint-ignore no-explicit-any
+    typeof (value as Record<string, any>)["close"] === "function";
+}
+
+export interface WritableStreamFromWriterOptions {
+  /**
+   * If the `writer` is also a `Closer`, automatically close the `writer`
+   * when the stream is closed, aborted, or a write error occurs.
+   *
+   * @default {true}
+   */
+  autoClose?: boolean;
+}
+
+/** Create a `WritableStream` from a `Writer`. */
+export function writableStreamFromWriter(
+  writer: Writer,
+  options: WritableStreamFromWriterOptions = {},
+): WritableStream<Uint8Array> {
+  const { autoClose = true } = options;
+
+  return new WritableStream({
+    async write(chunk, controller) {
+      try {
+        await writeAll(writer, chunk);
+      } catch (e) {
+        controller.error(e);
+        if (isCloser(writer) && autoClose) {
+          writer.close();
+        }
+      }
+    },
+    close() {
+      if (isCloser(writer) && autoClose) {
+        writer.close();
+      }
+    },
+    abort() {
+      if (isCloser(writer) && autoClose) {
+        writer.close();
+      }
+    },
+  });
+}