“`

Mastering Monorepos in Next.js: A Step-by-Step Guide

What is a Monorepo?

A monorepo is a single version-controlled repository that contains multiple isolated projects with well-defined relationships. This approach differs from traditional methods of software development, where each project is stored in a separate repository with its own configuration for building, testing, and deployment.

Benefits of Using a Monorepo in Next.js

• Simple Code Sharing: With a monorepo, you can easily share reusable code and configurations across projects.
• Atomic Commits: Make large-scale changes affecting multiple applications in a single commit, while ensuring the application works as expected before committing changes.
• Consistency: Monorepos offer better consistency than polyrepos, since the codebase is all in one place and each project can easily share the same coding style and tools for testing, deployment, and code maintenance.

Monorepo Tools

• Turborepo: A smart build system maintained by Vercel for JavaScript/TypeScript monorepos.
• Nx: A next-generation build system with first-class monorepo support and powerful integrations.
• Bazel: A fast, scalable, multi-language, and extensible build system.
• Lerna: A fast and modern build system for managing and publishing multiple JavaScript/TypeScript packages from the same repository.

Building a Monorepo in Next.js

We’ll use Turborepo as our build system.

Step 1: Create a New Directory and Set up the Package.json

mkdir my-monorepo
cd my-monorepo
npm init -y

Step 2: Create Workspaces

mkdir admin store

Step 3: Set up the Next.js Applications

npx create-next-app admin
npx create-next-app store

Step 4: Install Turborepo

npm install turborepo --save-dev

Step 5: Configure Turborepo

// turbo.json
{
  "pipeline": {
    "build": {
      "commands": ["next build"]
    },
    "dev": {
      "commands": ["next dev"]
    }
  }
}

Step 6: Create a Reusable Configuration Package

mkdir config

// config/eslint.js
module.exports = {
  // your eslint config here
};

“`