@shipengine/connect-carrier-api/src/app/metadata/label-sizes.ts

This is the typescript/javascript definitions for carrier api

import Joi from 'joi';

export enum LabelSizesEnum {
  Inches4x6 = 'Inches4x6',
  Inches4x8 = 'Inches4x8',
}

export const LabelSizesEnumSchema = Joi.string().valid(...Object.values(LabelSizesEnum));