@storm-stack/date-time/dist/utilities/is-instant.mjs

This package includes a DateTime class, various utility functions for working with dates and times, and a number of formatting options.

import { Temporal } from "@js-temporal/polyfill";
import { isFunction, isSet } from "@storm-stack/types";
export function isInstant(value) {
  return isSet(value) && (value instanceof Temporal.Instant || isFunction(value?.toZonedDateTime));
}