From d47147fb6ad229b1c039aff9d0959b6e281f4df5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bartek=20Iwa=C5=84czuk?= <biwanczuk@gmail.com>
Date: Tue, 14 Feb 2023 17:38:45 +0100
Subject: feat(ext/node): embed std/node into the snapshot (#17724)

This commit moves "deno_std/node" in "ext/node" crate. The code is
transpiled and snapshotted during the build process.

During the first pass a minimal amount of work was done to create the
snapshot, a lot of code in "ext/node" depends on presence of "Deno"
global. This code will be gradually fixed in the follow up PRs to migrate
it to import relevant APIs from "internal:" modules.

Currently the code from snapshot is not used in any way, and all
Node/npm compatibility still uses code from
"https://deno.land/std/node" (or from the location specified by
"DENO_NODE_COMPAT_URL"). This will also be handled in a follow
up PRs.

---------

Co-authored-by: crowlkats <crowlkats@toaxl.com>
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>
---
 ext/node/polyfills/internal/streams/legacy.mjs | 113 +++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 ext/node/polyfills/internal/streams/legacy.mjs

(limited to 'ext/node/polyfills/internal/streams/legacy.mjs')

diff --git a/ext/node/polyfills/internal/streams/legacy.mjs b/ext/node/polyfills/internal/streams/legacy.mjs
new file mode 100644
index 000000000..0de18956f
--- /dev/null
+++ b/ext/node/polyfills/internal/streams/legacy.mjs
@@ -0,0 +1,113 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// deno-lint-ignore-file
+
+import EE from "internal:deno_node/polyfills/events.ts";
+
+function Stream(opts) {
+  EE.call(this, opts);
+}
+Object.setPrototypeOf(Stream.prototype, EE.prototype);
+Object.setPrototypeOf(Stream, EE);
+
+Stream.prototype.pipe = function (dest, options) {
+  // deno-lint-ignore no-this-alias
+  const source = this;
+
+  function ondata(chunk) {
+    if (dest.writable && dest.write(chunk) === false && source.pause) {
+      source.pause();
+    }
+  }
+
+  source.on("data", ondata);
+
+  function ondrain() {
+    if (source.readable && source.resume) {
+      source.resume();
+    }
+  }
+
+  dest.on("drain", ondrain);
+
+  // If the 'end' option is not supplied, dest.end() will be called when
+  // source gets the 'end' or 'close' events.  Only dest.end() once.
+  if (!dest._isStdio && (!options || options.end !== false)) {
+    source.on("end", onend);
+    source.on("close", onclose);
+  }
+
+  let didOnEnd = false;
+  function onend() {
+    if (didOnEnd) return;
+    didOnEnd = true;
+
+    dest.end();
+  }
+
+  function onclose() {
+    if (didOnEnd) return;
+    didOnEnd = true;
+
+    if (typeof dest.destroy === "function") dest.destroy();
+  }
+
+  // Don't leave dangling pipes when there are errors.
+  function onerror(er) {
+    cleanup();
+    if (EE.listenerCount(this, "error") === 0) {
+      this.emit("error", er);
+    }
+  }
+
+  prependListener(source, "error", onerror);
+  prependListener(dest, "error", onerror);
+
+  // Remove all the event listeners that were added.
+  function cleanup() {
+    source.removeListener("data", ondata);
+    dest.removeListener("drain", ondrain);
+
+    source.removeListener("end", onend);
+    source.removeListener("close", onclose);
+
+    source.removeListener("error", onerror);
+    dest.removeListener("error", onerror);
+
+    source.removeListener("end", cleanup);
+    source.removeListener("close", cleanup);
+
+    dest.removeListener("close", cleanup);
+  }
+
+  source.on("end", cleanup);
+  source.on("close", cleanup);
+
+  dest.on("close", cleanup);
+  dest.emit("pipe", source);
+
+  // Allow for unix-like usage: A.pipe(B).pipe(C)
+  return dest;
+};
+
+function prependListener(emitter, event, fn) {
+  // Sadly this is not cacheable as some libraries bundle their own
+  // event emitter implementation with them.
+  if (typeof emitter.prependListener === "function") {
+    return emitter.prependListener(event, fn);
+  }
+
+  // This is a hack to make sure that our error handler is attached before any
+  // userland ones.  NEVER DO THIS. This is here only because this code needs
+  // to continue to work with older versions of Node.js that do not include
+  // the prependListener() method. The goal is to eventually remove this hack.
+  if (!emitter._events || !emitter._events[event]) {
+    emitter.on(event, fn);
+  } else if (Array.isArray(emitter._events[event])) {
+    emitter._events[event].unshift(fn);
+  } else {
+    emitter._events[event] = [fn, emitter._events[event]];
+  }
+}
+
+export { prependListener, Stream };
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