By default it is:

mix.generateSW();

It is working..but I want to change the destination of service-worker.js. So:

mix.generateSW({
    // Set the path to the service-worker.js file
    swDest: '/js/service-worker.js',
    .
    .
    .
});

It is generated correctly. But the other assets caching don't work. The error in the console is:

Uncaught (in promise) bad-precaching-response: The precaching request for 'http://example.com/js/style.css' failed with an HTTP status of 404.