@prismicio/types-internal/src/customtypes/widgets/shared/ImageConstraint.ts

Prismic types for Custom Types and Prismic Data

import { either } from "fp-ts/lib/Either"
import * as t from "io-ts"
import { IntFromString } from "io-ts-types/lib/IntFromString"

import { IntFromNumber, IntFromPixels } from "../../../validators"

const SideConstraint = new t.Type<number | null, unknown, unknown>(
	"SideConstraints",
	(u: unknown): u is number | null => {
		return !u || typeof u === "number"
	},
	(u: unknown, context: t.Context) => {
		return either.chain(
			t
				.union([
					t.literal("auto"),
					t.literal(""),
					t.Int,
					IntFromString,
					IntFromNumber,
					IntFromPixels,
					t.null,
				])
				.validate(u, context),
			(constraint) => {
				if (constraint === "auto" || constraint === "") return t.success(null)
				return t.success(constraint)
			},
		)
	},
	(res) => res,
)

const ImageConstraint = t.partial({
	width: SideConstraint,
	height: SideConstraint,
})

type ImageConstraint = t.TypeOf<typeof ImageConstraint>

export default ImageConstraint