fix: handle native pnpm execpath

test/scripts/pnpm-runner.test.ts

@@ -1,8 +1,11 @@
+import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import os from "node:os";
+import path from "node:path";
 import { describe, expect, it } from "vitest";
 import { createPnpmRunnerSpawnSpec, resolvePnpmRunner } from "../../scripts/pnpm-runner.mjs";
 
 describe("resolvePnpmRunner", () => {
-  it("uses npm_execpath when it points to pnpm", () => {
+  it("uses npm_execpath when it points to a JS pnpm entrypoint", () => {
     expect(
       resolvePnpmRunner({
         npmExecPath: "/home/test/.cache/node/corepack/v1/pnpm/10.32.1/bin/pnpm.cjs",
@@ -22,6 +25,29 @@ describe("resolvePnpmRunner", () => {
     });
   });
 
+  it("uses npm_execpath when it points to a shebang pnpm script", () => {
+    const tempDir = mkdtempSync(path.join(os.tmpdir(), "pnpm-runner-"));
+    const npmExecPath = path.join(tempDir, "pnpm");
+    writeFileSync(npmExecPath, "#!/usr/bin/env node\nconsole.log('pnpm');\n");
+
+    try {
+      expect(
+        resolvePnpmRunner({
+          npmExecPath,
+          nodeExecPath: "/usr/local/bin/node",
+          pnpmArgs: ["exec", "vitest", "run"],
+          platform: "linux",
+        }),
+      ).toEqual({
+        command: "/usr/local/bin/node",
+        args: [npmExecPath, "exec", "vitest", "run"],
+        shell: false,
+      });
+    } finally {
+      rmSync(tempDir, { recursive: true, force: true });
+    }
+  });
+
   it("prepends node args when launching pnpm through node", () => {
     expect(
       resolvePnpmRunner({
@@ -44,6 +70,28 @@ describe("resolvePnpmRunner", () => {
     });
   });
 
+  it("falls back to bare pnpm when npm_execpath points to a native pnpm binary", () => {
+    const tempDir = mkdtempSync(path.join(os.tmpdir(), "pnpm-runner-"));
+    const npmExecPath = path.join(tempDir, "pnpm");
+    writeFileSync(npmExecPath, Buffer.from([0x7f, 0x45, 0x4c, 0x46]));
+
+    try {
+      expect(
+        resolvePnpmRunner({
+          npmExecPath,
+          pnpmArgs: ["exec", "vitest", "run"],
+          platform: "linux",
+        }),
+      ).toEqual({
+        command: "pnpm",
+        args: ["exec", "vitest", "run"],
+        shell: false,
+      });
+    } finally {
+      rmSync(tempDir, { recursive: true, force: true });
+    }
+  });
+
   it("falls back to bare pnpm on non-Windows when npm_execpath is missing", () => {
     expect(
       resolvePnpmRunner({