message: classNames: extract classname type
diff: import { ObjectClassNames } from '../types/props';
  -export default function classNames(...classnames: Array<number | string | ObjectClassNames | false | null | undefined>) {
  +type ClassName = number | string | ObjectClassNames | false | null | undefined;
  +
  +export default function classNames(...classnames: ClassName[]) {
  let result: string[] = [];
  - classnames.forEach((item: number | string | ObjectClassNames): void => {
  + classnames.forEach((item: ClassName): void => {
  if (!item) {
  return;
  }
  