module.exports = BigClass

function BigClass () {}

require('./expansion') // I've tried moving this about, to no avail

BigClass.prototype.doAThing = function () {
  console.log(`I did a thing`)
  this.doAnotherThing() // Intellisense doesn't suggest this as an option - but it's legit
}

const BigClass = require('./index')

BigClass.prototype.doAnotherThing = function () {
  console.log(`I did another thing`)
}