Using vitest 4 (#2815)

Instead of #2763 

It became insanely fast!

- changes to the pool options (beta 19):
https://github.com/AriPerkkio/vitest/blob/713b9f40c3fbd42ce97a28297c64668fad06fd9f/docs/advanced/pool.md

Author: RobinTail

example/vitest.config.ts

@@ -1,14 +1,17 @@
 import { defineConfig } from "vitest/config";
+import { ThreadsPoolWorker } from "vitest/node";
 
 export default defineConfig({
   test: {
     globals: true,
-    pool: "threads",
-    poolOptions: {
-      threads: {
-        /** @todo remove when unflagged https://nodejs.org/docs/v24.0.0/api/globals.html#eventsource */
-        execArgv: ["--experimental-eventsource"],
-      },
+    pool: {
+      name: "custom-threads-pool",
+      createPoolWorker: (opt) =>
+        new ThreadsPoolWorker({
+          ...opt,
+          /** @todo remove when unflagged https://nodejs.org/docs/v24.0.0/api/globals.html#eventsource */
+          execArgv: ["--experimental-eventsource"],
+        }),
     },
   },
 });

express-zod-api/tests/__snapshots__/upload-schema.spec.ts.snap

@@ -20,7 +20,7 @@ exports[`ez.upload() > parsing > should accept UploadedFile 0 1`] = `
     "encoding": "utf-8",
     "md5": "",
     "mimetype": "image/jpeg",
-    "mv": [MockFunction spy],
+    "mv": [MockFunction],
     "name": "avatar.jpg",
     "size": 100500,
     "tempFilePath": "",
@@ -50,7 +50,7 @@ exports[`ez.upload() > parsing > should accept UploadedFile 1 1`] = `
     "encoding": "utf-8",
     "md5": "",
     "mimetype": "image/jpeg",
-    "mv": [MockFunction spy],
+    "mv": [MockFunction],
     "name": "avatar.jpg",
     "size": 100500,
     "tempFilePath": "",

package.json

@@ -17,7 +17,7 @@
     "@arethetypeswrong/core": "^0.18.2",
     "@tsconfig/node20": "^20.1.5",
     "@types/node": "^24.0.0",
-    "@vitest/coverage-v8": "^3.2.3",
+    "@vitest/coverage-v8": "^4.0.1",
     "eslint": "^9.28.0",
     "eslint-config-prettier": "^10.1.5",
     "eslint-plugin-allowed-dependencies": "^2.0.0",
@@ -27,7 +27,7 @@
     "tsdown": "^0.15.3",
     "tsx": "^4.19.4",
     "typescript-eslint": "catalog:dev",
-    "vitest": "^3.2.3"
+    "vitest": "^4.0.1"
   },
   "packageManager": "[email protected]+sha512.c9fc7236e92adf5c8af42fd5bf1612df99c2ceb62f27047032f4720b33f8eacdde311865e91c411f2774f618d82f320808ecb51718bfa82c060c4ba7c76a32b8"
 }