import Joi from "joi" ; see https export type BarcodeFormat = "PKBarcodeFormatQR" | "PKBarcodeFormatPDF417" | "PKBarcodeFormatAztec" | "PKBarcodeFormatCode128" ; export interface Barcode { altText ? : string ; messageEncoding ? : string ; format : BarcodeFormat ; message : string ; } export const Barcode = Joi . object < Barcode > ( ) . keys ( { altText : Joi . string ( ) , messageEncoding : Joi . string ( ) . default ( "iso-8859-1" ) , format : Joi . string ( ) . required ( ) . regex ( /(PKBarcodeFormatQR|PKBarcodeFormatPDF417|PKBarcodeFormatAztec|PKBarcodeFormatCode128)/ , "barcodeType" ) , message : Joi . string ( ) . required ( ) , } ) ;