function canConvert (input) {
  return (
    input != null && (
      typeof input === 'string' ||
      (input.nodeType && (
        input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11
      ))
    )
  )
}
Determines whether an input can be converted
@private
@param {String|HTMLElement} input Describe this parameter
@returns Describe what it returns
@type String|Object|Array|Boolean|Number