Binary is the very core of everything digital, not only in web development, but literally everything: from variables and file data to transport protocols and executables themselves.

Events handling and promises in particular are hands down the best JavaScript feature. You're probably familiar with the concept itself, but in short, a Promise in JavaScript is a promise to call back with the result.

There are quite a few cases where you can benefit from importing an arbitrary file directly: in universal apps, tests, or simply to avoid boilerplate. Good news: you don't need Babel, Webpack, or anything else for it.