If you've recognized the difference between how we call methods in dedicated workers versus how we call them in shared workers, well done! Instead of just calling methods on self, we're calling all the dedicated web worker methods on the port object, which is how the worker distinguishes between so many scripts that (can possibly) talk to it:

// myworker.js
addEventListener('connect', e => {
    console.log(e.ports);
    const port = e.ports[0];
    port.start();
    port.addEventListener('message', event => {
        console.log('Some calling script says.. ', event.data); 
        // some work
        port.postMessage("Hello ;)");
    });
});

It is exactly like the code above, but with the exception that this time our shared worker replies to whoever sent the message and says Hello to it.