fix: infinite worker process spawned for invalid JS file

Author: VladimirMikulic

src/classes/child-pool.ts

@@ -15,7 +15,7 @@ const getFreePort = async () => {
  return new Promise(resolve => {
  const server = createServer();
  server.listen(0, () => {
- const { port } = (server.address() as AddressInfo);
+ const { port } = server.address() as AddressInfo;
  server.close(() => resolve(port));
  });
  });
@@ -121,8 +121,13 @@ export class ChildPool {
  child.stdout.pipe(process.stdout);
  child.stderr.pipe(process.stderr);
 
- await initChild(child, child.processFile);
- return child;
+ try {
+ await initChild(child, child.processFile);
+ return child;
+ } catch (err) {
+ _this.release(child);
+ throw err;
+ }
  }
 
  release(child: ChildProcessExt): void {