Server-Only Utility Functions

// lib/server-utils.ts
import 'server-only';

export async function getSecretConfig() {
  return {
    dbUrl: process.env.DATABASE_URL!,
    apiKey: process.env.API_SECRET_KEY!,
    jwtSecret: process.env.JWT_SECRET!,
  };
}

export async function hashPassword(password: string): Promise<string> {
  const { createHash } = await import('crypto');
  return createHash('sha256').update(password).digest('hex');
}

export async function verifyToken(token: string) {
  const config = await getSecretConfig();
  // Verify JWT token server-side only
  return { valid: true, userId: '123' };
}

// If a client component tries to import this file,
// it will throw a build error:
// "This module cannot be imported from a Client Component module."

// Usage in a Server Component:
// import { getSecretConfig } from '@/lib/server-utils';