keyOf = function (oneKeyObj) {
  var key;
  for (key in oneKeyObj) {
    if (!oneKeyObj.hasOwnProperty(key)) {
      continue;
    }
    return key;
  }
  return null;
}
Allows extraction of a minified key. Let's the build system minify keys
without losing the ability to dynamically use key strings as values
themselves. Pass in an object with a single key/val pair and it will return
you the string key of that single record. Suppose you want to grab the
value for a key 'className' inside of an object. Key/val minification may
have aliased that key to be 'xa12'. keyOf({className: null}) will return
'xa12' in that case. Resolve keys you want to use once at startup time, then
reuse those resolutions.