lib/TypeParser.js
function keyOptions (key, options) {
  const _key = options._key == null
    ? key
    : options._key + '.' + key
  return Object.assign({}, options, { _key: _key })
}
function keyOptions (key, options) {
  const _key = options._key == null
    ? key
    : options._key + '.' + key
  return Object.assign({}, options, { _key: _key })
}
function keyOptions ( key , options ) { const _key = options . _key == null ? key : options . _key + '.' + key return Object . assign ( { } , options , { _key : _key } ) }
Add property key to options.
Add property key to options .