Handle Deno Web Worker error

[korywka]

When we throw Error inside worker, the whole Deno is crashed: Uncaught (in promise) Error: Unhandled error in child worker.
In spite of the onerror handler is set:

worker = new Worker(new URL('./worker.ts', import.meta.url).href, {
  type: 'module',
});
worker.onerror = (error) => {
  console.error(error);
};

What is the correct way to handle worker errors for Deno? Thank you in advance.

[korywka]

Looks like adding error.preventDefault(); helps to prevent Deno crashing. Kudos to ChatGPT and I wish Deno docs mention this too.

[josephrocca]

I think another way to handle worker errors in Deno is to place this within the worker script:

self.addEventListener("unhandledrejection", (event) => {
  console.error("Unhandled rejection:", event.reason);
  event.preventDefault();
  // Terminate the worker manually if you want to:
  // self.close();
});