React URL propType

urlPropType.js

import { curry } from 'lodash'

// isRequired :: Bool => True
export const isRequired = true

// url :: Bool? -> [Prop] -> String -> String -> Either(Error, Nothing)
export const url = curry((
    required = false,
    props,
    propName,
    componentName,
    location,
    propFullName,
    secret
  ) => {

  const FALSEY = [undefined, null, ''].includes(props[propName])

  const URL_PATTERN = /[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi

  const URL_ERROR = 'Invalid prop `' + propName + '` supplied to' +
  ' `' + componentName + '`: ' + propName +
  ' is not a URL. Validation failed.'

  const isValid = URL_PATTERN.test(props[propName])

  return required
    ? isValid
      ? true
      : new Error(URL_ERROR)
    : isValid || FALSEY
      ? true
      : new Error(URL_ERROR)
})

export default {
  isRequired,
  url
}