fix(dev): start pnpm through a shell on Windows

scripts/dev.mjs

@@ -185,13 +185,22 @@ export function developmentServiceEnvironment(prepared, base = process.env) {
   return environment;
 }
 
+export function usesWindowsCmdShell(command, platform = process.platform) {
+  return platform === "win32" && /\.(cmd|bat)$/i.test(command);
+}
+
 export function run(
   command,
   args,
   { cwd = repoRoot, label = [command, ...args].join(" "), environment = process.env } = {},
 ) {
   return new Promise((resolve, reject) => {
-    const child = spawn(command, args, { cwd, env: environment, stdio: "inherit" });
+    const child = spawn(command, args, {
+      cwd,
+      env: environment,
+      stdio: "inherit",
+      shell: usesWindowsCmdShell(command),
+    });
     child.once("error", (error) => {
       const hint =
         error.code === "ENOENT"

scripts/dev.test.mjs

@@ -10,6 +10,7 @@ import {
   prepareDevEnv,
   setEnvIfBlank,
   usesLocalStorage,
+  usesWindowsCmdShell,
 } from "./dev.mjs";
 
 const example = [
@@ -280,3 +281,11 @@ test("an exported development origin overrides the env file, and a blank one is
   });
   assert.equal(blank.devOrigins, "from-file.example.dev");
 });
+
+test("Windows .cmd/.bat spawns use a shell so Node does not throw EINVAL", () => {
+  assert.equal(usesWindowsCmdShell("pnpm.cmd", "win32"), true);
+  assert.equal(usesWindowsCmdShell("pnpm.bat", "win32"), true);
+  assert.equal(usesWindowsCmdShell("pnpm", "win32"), false);
+  assert.equal(usesWindowsCmdShell("docker", "win32"), false);
+  assert.equal(usesWindowsCmdShell("pnpm.cmd", "linux"), false);
+});