message: chore: remove unused util
diff: import { ValidationFlags } from '../types';
  import { ValidationClassMap } from '../config';
  -export const isValidDate = (value: unknown): value is Date => {
  - const valueAsDate = value as any;
  - if (valueAsDate && isCallable(valueAsDate.getTime)) {
  - return !isNaN(valueAsDate.getTime());
  - }
  -
  - return false;
  -};
  -
  /**
  * Gets the data attribute. the name must be kebab-case.
  */
  @@ -346,4 +337,4 @@ export const interpolate = (template: string, values: { [k: string]: any }) => {
  return template.replace(/\{([^}]+)\}/g, (_, p) => {
  return values[p] || `{${p}}`;
  });
  -}
  \ No newline at end of file
  +};
  