Vielzeug

Appearance

Fibonacci with Pool and Timeout ​

Problem ​

Implement fibonacci with pool and timeout in a production-friendly way with @vielzeug/workit while keeping setup and cleanup explicit.

Runnable Example ​

The snippet below is copy-paste runnable in a TypeScript project with @vielzeug/workit installed.

Classic CPU-bound example with a safety timeout:

ts
import { createWorker } from '@vielzeug/workit';

const fibPool = createWorker<number, number>(
  function fib(n) {
    if (n <= 1) return n;
    return fib(n - 1) + fib(n - 2);
  },
  { concurrency: 4, timeout: 5000 },
);

const inputs = [30, 32, 34, 36, 38, 40];
const results = await Promise.all(inputs.map((n) => fibPool.run(n)));
console.log(results); // [832040, 2178309, 5702887, 14930352, 39088169, 102334155]

fibPool.dispose();

Expected Output ​

  • The example runs without type errors in a standard TypeScript setup.
  • The main flow produces the behavior described in the recipe title.

Common Pitfalls ​

  • Forgetting cleanup/dispose calls can leak listeners or stale state.
  • Skipping explicit typing can hide integration issues until runtime.
  • Not handling error branches makes examples harder to adapt safely.