自定义Flutter service worker

Question

Flutter automatically generates a service worker flutter_service_worker.js when building for the web but I would like to add my own fetch/caching rules for third-party routes.

How can I achieve that?

Answer 1

So far the only workaround that I have found is to make a script that post-processes the generated flutter_service_worker.js and replaces:

  if (!RESOURCES[key]) {
    return;
  }

by

  if (!RESOURCES[key]) {
     return customFetch();
  }

where customFetch() implements my own caching rules.