Type-Safe Environment Variables

import { z } from 'zod';

const envSchema = z.object({
  // Public vars (exposed to client)
  PUBLIC_SUPABASE_URL: z.string().url(),
  PUBLIC_SUPABASE_ANON_KEY: z.string().min(1),
  PUBLIC_POSTHOG_KEY: z.string().optional(),

  // Private vars (server-only)
  SUPABASE_SERVICE_KEY: z.string().min(1),
  RESEND_API_KEY: z.string().optional(),
  DATABASE_URL: z.string().url(),
});

function validateEnv() {
  const parsed = envSchema.safeParse(import.meta.env);

  if (!parsed.success) {
    console.error('❌ Invalid environment variables:');
    console.error(parsed.error.flatten().fieldErrors);
    throw new Error('Invalid environment variables');
  }

  return parsed.data;
}

// Export typed env object
export const env = validateEnv();

// Usage:
// import { env } from './env';
// const url = env.PUBLIC_SUPABASE_URL; // ✅ Typed!