Java JavaScript - What Are the Other Restrictions?

Don't modify the prototypes of like things that are built into the language. Extra instance files are JavaScript with type annotations in them, but they don't define any actual functionality. Google closure is a whole program optimizer. So it needs to see all of your code whenever,. Like when you travel all of the JavaScript code inside, it should see everything. But when we use like any kind of NPM package or anything, it cannot see everything.