@prismicio/types-internal/src/validators/DateFromStringOrNumber.ts

Prismic types for Custom Types and Prismic Data

import { chain } from "fp-ts/Either"
import { pipe } from "fp-ts/function"
import * as t from "io-ts"

export default new t.Type<Date, Date, unknown>(
	"dateFromStringOrNumber",
	(u): u is Date => u instanceof Date,
	(u, c) =>
		pipe(
			t.union([t.number, t.string]).validate(u, c),
			chain((s) => {
				const d = new Date(s)
				return isNaN(d.getTime()) ? t.failure(u, c) : t.success(d)
			}),
		),
	(date) => date,
)