create-phaser-app/src/lib/linear-scale.js

A boiler plate to start your phaser app with webpack4, babel7+ and Phaser 3

export default function linearScale(domain, range) {
  return function(value) {
    if (domain[0] === domain[1] || range[0] === range[1]) {
      return range[0];
    }
    var ratio = (range[1] - range[0]) / (domain[1] - domain[0]),
      result = range[0] + ratio * (value - domain[0]);
    return result;
  };
}