Embed service worker in application JS

Now service worker is called with:

 navigator.serviceWorker.register('/js/sw.js')
        .then(function (swReg) {

Can I call it like that:

var sw = //paste here all sw.js file's code;
navigator.serviceWorker.register(//call sw variable)
            .then(function (swReg) {

I know that serviceWorker.register can contain only path to sw.js but can I embed sw.js in app.js in someway?