Laufzeit-Schema-Validierung für typisierte Store-Daten

import { writable } from 'svelte/store';
import { z } from 'zod';
 
const UserProfileSchema = z.object({
  id: z.number().int().positive(),
  email: z.string().email(),
  roles: z.array(z.string())
});
 
export function createValidatedUserStore(initialData) {
  const { subscribe, set } = writable(null);
  
  function updateSafely(newData) {
    const result = UserProfileSchema.safeParse(newData);
    if (!result.success) {
      throw new TypeError(`Invalid store data structure: ${result.error.message}`);
    }
    set(result.data);
  }
  
  updateSafely(initialData);
  return { subscribe, setSafely: updateSafely };
}