Thanks for your reply.
I forgot to bring up that Safari now can support service-worker.
So
const isApple = !!navigator.platform.match(/(Mac|iPhone|iPod|iPad)/i);
should be remove Mac condition in my opinion.
Also in discourse/app/assets/javascripts/discourse/initializers/register-service-worker.js.es6 at abbc639e0d362ae90b52c8b5c6922d9e610777f8 · discourse/discourse · GitHub the else condition would also unregister service worker, it should add the url condition.