Refactor: use jest-worker

Build/lib/worker.ts

@@ -0,0 +1,28 @@
+import process from 'node:process';
+import type { JestWorkerFarm } from 'jest-worker';
+import { Worker as JestWorker } from 'jest-worker';
+
+const sharedWorkerOptions = {
+  numWorkers: 1,
+  enableWorkerThreads: true,
+  forkOptions: {
+    env: {
+      ...process.env,
+      NODE_OPTIONS: process.env.NODE_OPTIONS
+    }
+  }
+} satisfies ConstructorParameters<typeof JestWorker>[1];
+
+export function createWorker<T extends Record<string, unknown>>(workerPath: string) {
+  return <const K extends ReadonlyArray<keyof T & string>>(exposedMethods: K): JestWorkerFarm<Pick<T, K[number]>> => {
+    const worker = new JestWorker(workerPath, {
+      ...sharedWorkerOptions,
+      exposedMethods
+    }) as JestWorkerFarm<Pick<T, K[number]>>;
+
+    worker.getStdout().pipe(process.stdout);
+    worker.getStderr().pipe(process.stderr);
+
+    return worker;
+  };
+}