import { isString } from 'typeable';

const BASE64_REGEX = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/;

export function stringBase64 (value: any): boolean {
  if (!isString(value)) return false;

  return BASE64_REGEX.test(value);
}