@prismicio/types-internal/src/validators/IntFromNumber.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 type IntFromNumberC = t.Type<t.Int, number, unknown>

/** A codec that succeeds if a number can be parsed to an integer */
export default new t.Type<t.Int, number, unknown>(
	"IntFromNumber",
	t.Int.is,
	(u, c) =>
		pipe(
			t.number.validate(u, c),
			chain((n) => {
				if (t.Int.is(n)) return t.success(n)
				else {
					return t.success(Math.round(n) as t.Int)
				}
			}),
		),
	t.Int.encode,
)