assertDateAfter

Assert that a Date holds a later instant than the expected one, with type-narrowing.

Comparing two instants through assertGreaterThan means reading epoch milliseconds out of the failure.

This reports both Dates in ISO form.

Usage

import { assertDateAfter } from "@kensio/smartass";

const dueAt: unknown = new Date("2026-06-01T00:00:00.000Z");

assertDateAfter(dueAt, new Date("2026-01-01T00:00:00.000Z"));

// dueAt is now narrowed to Date

Source

Source file: src/assert/date-after/date-after.assert.ts