vender part of requires-port that we use

- so can have type checks
- remove a runtime dep that isn't maintained

Author: williamstein

lib/http-proxy/common.ts

@@ -1,4 +1,3 @@
-import * as required from "requires-port";
 import type { ProxyTargetDetailed, ServerOptions } from "./index";
 import { type IncomingMessage as Request } from "http";
 import { TLSSocket } from "tls";
@@ -235,3 +234,24 @@ function getPath(url?: string): string {
   const u = new URL(url ?? "", "http://dummy");
   return `${u.pathname ?? ""}${u.search ?? ""}`;
 }
+
+// vendor simplified version of https://www.npmjs.com/package/requires-port to
+// reduce dep and add typescript.
+function required(port: number, protocol: string): boolean {
+  protocol = protocol.split(":")[0];
+  port = +port;
+
+  if (!port) return false;
+
+  switch (protocol) {
+    case "http":
+    case "ws":
+      return port !== 80;
+
+    case "https":
+    case "wss":
+      return port !== 443;
+  }
+
+  return port !== 0;
+}

package.json

@@ -15,8 +15,7 @@
   "main": "dist/lib/index.js",
   "dependencies": {
     "debug": "^4.4.0",
-    "follow-redirects": "^1.15.9",
-    "requires-port": "^1.0.0"
+    "follow-redirects": "^1.15.9"
   },
   "devDependencies": {
     "@types/debug": "^4.1.12",