export default function normalizeClassNames(
  ...classNames: Array<typeof undefined | boolean | null | string>
): Array<string> {
  const rval = []
  for (const className of classNames) {
    if (className && typeof className === "string") {
      for (const [s] of Array.from(className.matchAll(/\S+/g))) {
        rval.push(s)
      }
    }
  }
  return rval
}