new syntax for changing how this-binding to functions works. just an idea for now.

1old.js

class App {
  ready() {
    alert("hello")
  }
}

const app = new App()

document.addEventListener("DOMContentLoaded", app.ready.bind(app))
// or
document.addEventListener("DOMContentLoaded", () => app.ready())

2new.js

class App {
  ready() {
    alert("hello")
  }
}

const app = new App()

document.addEventListener("DOMContentLoaded", app->ready)

Meh, nothing special.