Validation of i18n translation json using zod

zod-i18n-validation.ts

// https://zod.dev/

import { z } from 'zod';
import ja from './ja.json';
import en from './en.json';

type RecursiveStringRecord = {
  [key: string]: string | RecursiveStringRecord;
}

type RecursiveZodStringRecord = {
  [key: string]: z.ZodString | RecursiveZodStringRecord;
}

type ZodStringRecord<T extends RecursiveStringRecord> = {
  [key in keyof T]: T[key] extends string
    ? z.ZodString
    : T[key] extends RecursiveStringRecord
    ? z.ZodObject<ZodStringRecord<T[key]>>
    : never;
}

function zodify<T extends RecursiveStringRecord>(obj: T): ZodStringRecord<T> {
  const zodified = {} as RecursiveZodStringRecord;
  for (const key in obj) {
    if (typeof obj[key] === 'string') {
      zodified[key as any] = z.string();
    } else {
      zodified[key as any] = z.object(zodify(obj[key] as any)) as any;
    }
  }
  return zodified as ZodStringRecord<T>;
}

const jaZod = zodify(ja);

const Translation = z.object(jaZod);

Translation.parse(ja);
Translation.parse(en);

export const translations = { en, ja } as const;