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/diagnostics_channel.ts | 89 +++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 ext/node/polyfills/diagnostics_channel.ts

(limited to 'ext/node/polyfills/diagnostics_channel.ts')

diff --git a/ext/node/polyfills/diagnostics_channel.ts b/ext/node/polyfills/diagnostics_channel.ts
new file mode 100644
index 000000000..c0918e4e2
--- /dev/null
+++ b/ext/node/polyfills/diagnostics_channel.ts
@@ -0,0 +1,89 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { ERR_INVALID_ARG_TYPE } from "internal:deno_node/polyfills/internal/errors.ts";
+import { validateFunction } from "internal:deno_node/polyfills/internal/validators.mjs";
+import { nextTick } from "internal:deno_node/polyfills/process.ts";
+
+type Subscriber = (message: unknown, name?: string) => void;
+
+export class Channel {
+  _subscribers: Subscriber[];
+  name: string;
+  constructor(name: string) {
+    this._subscribers = [];
+    this.name = name;
+  }
+
+  publish(message: unknown) {
+    for (const subscriber of this._subscribers) {
+      try {
+        subscriber(message, this.name);
+      } catch (err) {
+        nextTick(() => {
+          throw err;
+        });
+      }
+    }
+  }
+
+  subscribe(subscription: Subscriber) {
+    validateFunction(subscription, "subscription");
+
+    this._subscribers.push(subscription);
+  }
+
+  unsubscribe(subscription: Subscriber) {
+    if (!this._subscribers.includes(subscription)) {
+      return false;
+    }
+
+    this._subscribers.splice(this._subscribers.indexOf(subscription), 1);
+
+    return true;
+  }
+
+  get hasSubscribers() {
+    return this._subscribers.length > 0;
+  }
+}
+
+const channels: Record<string, Channel> = {};
+
+export function channel(name: string) {
+  if (typeof name !== "string" && typeof name !== "symbol") {
+    throw new ERR_INVALID_ARG_TYPE("channel", ["string", "symbol"], name);
+  }
+
+  if (!Object.hasOwn(channels, name)) {
+    channels[name] = new Channel(name);
+  }
+
+  return channels[name];
+}
+
+export function hasSubscribers(name: string) {
+  if (!Object.hasOwn(channels, name)) {
+    return false;
+  }
+
+  return channels[name].hasSubscribers;
+}
+
+export function subscribe(name: string, subscription: Subscriber) {
+  const c = channel(name);
+
+  return c.subscribe(subscription);
+}
+
+export function unsubscribe(name: string, subscription: Subscriber) {
+  const c = channel(name);
+
+  return c.unsubscribe(subscription);
+}
+
+export default {
+  channel,
+  hasSubscribers,
+  subscribe,
+  unsubscribe,
+  Channel,
+};
-- 
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