@prismicio/types-internal/src/validators/IntFromPixels.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 IntFromPixelsC = t.Type<t.Int, string, unknown>

const PixelsRegex = /^([0-9]+)px$/
/**
 * A codec that succeeds if a string representing pixels (eg: "200px") can be
 * parsed to an integer
 */
export default new t.Type<t.Int, string, unknown>(
	"IntFromPixels",
	t.Int.is,
	(u, c) =>
		pipe(
			t.string.validate(u, c),
			chain((strPixels) => {
				try {
					const matched = strPixels.match(PixelsRegex)
					if (!matched) return t.failure(u, c)

					/* eslint-disable  @typescript-eslint/no-non-null-assertion */
					const parsed = parseInt(matched[1]!) as t.Int
					return t.success(parsed)
				} catch {
					return t.failure(u, c)
				}
			}),
		),
	String,
)