fix(test): clean up vitest child process groups

scripts/run-vitest.mjs

@@ -1,6 +1,10 @@
 import { createRequire } from "node:module";
 import path from "node:path";
 import { spawnPnpmRunner } from "./pnpm-runner.mjs";
+import {
+  installVitestProcessGroupCleanup,
+  shouldUseDetachedVitestProcessGroup,
+} from "./vitest-process-group.mjs";
 
 const TRUTHY_ENV_VALUES = new Set(["1", "true", "yes", "on"]);
 const require = createRequire(import.meta.url);
@@ -22,18 +26,28 @@ export function resolveVitestCliEntry() {
   return path.join(path.dirname(vitestPackageJson), "vitest.mjs");
 }
 
+export function resolveVitestSpawnParams(env = process.env, platform = process.platform) {
+  return {
+    env,
+    detached: shouldUseDetachedVitestProcessGroup(platform),
+  };
+}
+
 function main(argv = process.argv.slice(2), env = process.env) {
   if (argv.length === 0) {
     console.error("usage: node scripts/run-vitest.mjs <vitest args...>");
     process.exit(1);
   }
 
+  const spawnParams = resolveVitestSpawnParams(env);
   const child = spawnPnpmRunner({
     pnpmArgs: ["exec", "node", ...resolveVitestNodeArgs(env), resolveVitestCliEntry(), ...argv],
-    env,
+    ...spawnParams,
   });
+  const teardownChildCleanup = installVitestProcessGroupCleanup({ child });
 
   child.on("exit", (code, signal) => {
+    teardownChildCleanup();
     if (signal) {
       process.kill(process.pid, signal);
       return;
@@ -42,6 +56,7 @@ function main(argv = process.argv.slice(2), env = process.env) {
   });
 
   child.on("error", (error) => {
+    teardownChildCleanup();
     console.error(error);
     process.exit(1);
   });