@prismicio/types-internal/src/content/fields/EmptyContent.ts

Prismic types for Custom Types and Prismic Data

import { either } from "fp-ts"
import { pipe } from "fp-ts/lib/function"
import * as t from "io-ts"

import type { FieldOrSliceType } from "../LegacyContentCtx"
import { hasContentType } from "../utils"

export const EmptyContentType = "EmptyContent"

export const isEmptyContent = (u: unknown): u is EmptyContent =>
	hasContentType(u) && u.__TYPE__ === EmptyContentType

const legacyReader = t.union([
	t.null,
	t.type({
		value: t.null,
	}),
])
type EmptyLegacy = t.TypeOf<typeof legacyReader>

export const EmptyLegacy = (type: FieldOrSliceType) =>
	new t.Type<EmptyContent, unknown, unknown>(
		"EmptyLegacy",
		isEmptyContent,
		(content) => {
			return pipe(
				legacyReader.decode(content),
				either.map(() => {
					return {
						type,
						__TYPE__: EmptyContentType,
					}
				}),
			)
		},

		() => null,
	)

export const EmptyContent = t.strict({
	type: t.string,
	__TYPE__: t.literal(EmptyContentType),
})

export type EmptyContent = t.TypeOf<typeof EmptyContent>