Fix bun --inspect with fully-qualified URL (#8267)

src/js/internal/debugger.ts

@@ -264,6 +264,9 @@ const defaultHostname = "localhost";
 const defaultPort = 6499;
 
 function parseUrl(input: string): URL {
+  if (input.startsWith("ws://") || input.startsWith("ws+unix://") || input.startsWith("unix://")) {
+    return new URL(input);
+  }
   const url = new URL(`ws://${defaultHostname}:${defaultPort}/${randomId()}`);
   for (const part of input.split(/(\[[a-z0-9:]+\])|:/).filter(Boolean)) {
     if (/^\d+$/.test(part)) {

test/cli/inspect/inspect.test.ts

@@ -1,4 +1,4 @@
-import { describe, test, expect, afterEach } from "bun:test";
+import { test, expect, afterEach } from "bun:test";
 import { bunExe, bunEnv, randomPort } from "harness";
 import { Subprocess, spawn } from "bun";
 import { WebSocket } from "ws";
@@ -179,6 +179,33 @@ const tests = [
       pathname: "/",
     },
   },
+  {
+    args: ["--inspect=ws://localhost/"],
+    url: {
+      protocol: "ws:",
+      hostname: "localhost",
+      port: anyPort,
+      pathname: "/",
+    },
+  },
+  {
+    args: ["--inspect=ws://localhost:0/"],
+    url: {
+      protocol: "ws:",
+      hostname: "localhost",
+      port: anyPort,
+      pathname: "/",
+    },
+  },
+  {
+    args: ["--inspect=ws://localhost:6499/foo/bar"],
+    url: {
+      protocol: "ws:",
+      hostname: "localhost",
+      port: "6499",
+      pathname: "/foo/bar",
+    },
+  },
 ];
 
 for (const { args, url: expected } of tests) {
@@ -254,6 +281,9 @@ for (const { args, url: expected } of tests) {
   });
 }
 
+// FIXME: Depends on https://github.com/oven-sh/bun/pull/4649
+test.todo("bun --inspect=ws+unix:///tmp/inspect.sock");
+
 afterEach(() => {
   inspectee?.kill();
 });