js/vendor/what-input.js

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window.whatInput = (function() {

  'use strict';

  /*
    ---------------
    variables
    ---------------
  */

  // array of actively pressed keys
  var activeKeys = [];

  // cache document.body
  var body;

  // boolean: true if touch buffer timer is running
  var buffer = false;

  // the last used input type
  var currentInput = null;

  // `input` types that don't accept text
  var nonTypingInputs = [
    'button',
    'checkbox',
    'file',
    'image',
    'radio',
    'reset',
    'submit'
  ];

  // detect version of mouse wheel event to use
  // via https://developer.mozilla.org/en-US/docs/Web/Events/wheel
  var mouseWheel = detectWheel();

  // list of modifier keys commonly used with the mouse and
  // can be safely ignored to prevent false keyboard detection
  var ignoreMap = [
    16, // shift
    17, // control
    18, // alt
    91, // Windows key / left Apple cmd
    93  // Windows menu / right Apple cmd
  ];

  // mapping of events to input types
  var inputMap = {
    'keydown': 'keyboard',
    'keyup': 'keyboard',
    'mousedown': 'mouse',
    'mousemove': 'mouse',
    'MSPointerDown': 'pointer',
    'MSPointerMove': 'pointer',
    'pointerdown': 'pointer',
    'pointermove': 'pointer',
    'touchstart': 'touch'
  };