fix: install vendored node_modules when using hardlinks (#9007)

* fix: install vendored node_modules when using hardlinks

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/install/install.zig

@@ -1366,7 +1366,7 @@ pub const PackageInstall = struct {
             cached_package_dir,
             this.allocator,
             &[_]bun.OSPathSlice{},
-            &[_]bun.OSPathSlice{bun.OSPathLiteral("node_modules")},
+            &[_]bun.OSPathSlice{},
         ) catch |err| return Result{
             .fail = .{ .err = err, .step = .opening_cache_dir },
         };

test/regression/issue/08093.test.ts

@@ -0,0 +1,80 @@
+import { file, spawn } from "bun";
+import { afterAll, afterEach, beforeAll, beforeEach, expect, it } from "bun:test";
+import { bunExe, bunEnv as env } from "harness";
+import { access, writeFile } from "fs/promises";
+import { join } from "path";
+import {
+  dummyAfterAll,
+  dummyAfterEach,
+  dummyBeforeAll,
+  dummyBeforeEach,
+  dummyRegistry,
+  package_dir,
+  readdirSorted,
+  requested,
+  root_url,
+  setHandler,
+} from "./../../cli/install/dummy.registry.js";
+
+beforeAll(dummyBeforeAll);
+afterAll(dummyAfterAll);
+beforeEach(dummyBeforeEach);
+afterEach(dummyAfterEach);
+
+it("should install vendored node_modules with hardlink", async () => {
+  const urls: string[] = [];
+  setHandler(
+    dummyRegistry(urls, {
+      "0.0.1": {},
+      latest: "0.0.1",
+    }),
+  );
+  await writeFile(
+    join(package_dir, "package.json"),
+    JSON.stringify({
+      name: "foo",
+      version: "0.0.1",
+      dependencies: {
+        "vendor-baz": "0.0.1",
+      },
+    }),
+  );
+  const { stdout, stderr, exited } = spawn({
+    cmd: [bunExe(), "install", "--backend", "hardlink"],
+    cwd: package_dir,
+    stdout: null,
+    stdin: "pipe",
+    stderr: "pipe",
+    env,
+  });
+
+  expect(stderr).toBeDefined();
+  const err = await new Response(stderr).text();
+  expect(err).toContain("Saved lockfile");
+  expect(stdout).toBeDefined();
+  const out = await new Response(stdout).text();
+  expect(out).toContain("1 package installed");
+
+  expect(await exited).toBe(0);
+  expect(urls.sort()).toEqual([`${root_url}/vendor-baz`, `${root_url}/vendor-baz-0.0.1.tgz`]);
+  expect(requested).toBe(2);
+
+  expect(await readdirSorted(join(package_dir, "node_modules"))).toEqual([".cache", "vendor-baz"]);
+  expect(await readdirSorted(join(package_dir, "node_modules", "vendor-baz"))).toEqual([
+    "cjs",
+    "index.js",
+    "package.json",
+  ]);
+  expect(await readdirSorted(join(package_dir, "node_modules", "vendor-baz", "cjs", "node_modules"))).toEqual([
+    "foo-dep",
+  ]);
+  expect(
+    await readdirSorted(join(package_dir, "node_modules", "vendor-baz", "cjs", "node_modules", "foo-dep")),
+  ).toEqual(["index.js"]);
+
+  expect(await file(join(package_dir, "node_modules", "vendor-baz", "package.json")).json()).toEqual({
+    name: "vendor-baz",
+    version: "0.0.1",
+  });
+  await access(join(package_dir, "bun.lockb"));
+});