Use ES7 double-colon bind while still referring to original "this"

fun-with-bindings.js

class Client {
  constructor(foo) {
    this.name = foo
  }
}

class Message {
  constructor(content) {
    this.content = content
  }
  get send() {
    const self = this;
    return function () {
      console.log(`${this.name} says "${self.content}"`)
    }
  }
}

const client = new Client('World')
const message = new Message('Hello')

client::message.send() // or `message.send.call(client)` if the "`::`" syntax is not supported
// outputs `World says "Hello"`