In the realm of modern web development, managing dependencies across multiple projects can be tedious. Enter pnpm, a fast and efficient package manager for JavaScript that excels in managing monorepos. This tutorial will guide you through the essentials of setting up a pnpm monorepo and optimizing your workflow.

A monorepo, short for "monolithic repository," is a version-controlled code repository that holds multiple projects. It simplifies dependency management, promotes code reuse, and encourages collaboration within teams.

Some of the benefits of using a monorepo include:

Before diving into pnpm, ensure you have Node.js and pnpm installed. You can install pnpm globally using npm with the following command:

To use shared dependencies efficiently, you may want to define these in the root 

my-monorepo

To install dependencies across all packages, run:

This command traverses each defined workspace and efficiently installs shared dependencies.

If one of the packages depends on another, you can link them seamlessly. For example, if 

project-b

 in the root directory, it automatically links 

Creating scripts in a monorepo allows you to run tasks across multiple projects. In your root 

, include a script that runs a command in each project:

{
  "scripts": {
    "build": "pnpm --filter ./packages/* run build"
  }
}

Navigating a pnpm monorepo may seem daunting initially, but the efficiency and organization it brings to your projects are invaluable. Whether you’re managing a small team project or a large enterprise application, pnpm will help streamline your workflow, improve dependency management, and enhance collaboration.

Jump into your monorepo adventure today, and harness the potential of pnpm for your projects!

<h1 class="heading-anchor-text" id="pnpm-monorepo-tutorial"><span>pnpm Monorepo Tutorial</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#pnpm-monorepo-tutorial">#</a></h1><p>In the realm of modern web development, managing dependencies across multiple projects can be tedious. Enter pnpm, a fast and efficient package manager for JavaScript that excels in managing monorepos. This tutorial will guide you through the essentials of setting up a pnpm monorepo and optimizing your workflow.</p><h2 class="heading-anchor-text" id="what-is-a-monorepo"><span>What is a Monorepo?</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#what-is-a-monorepo">#</a></h2><p>A monorepo, short for "monolithic repository," is a version-controlled code repository that holds multiple projects. It simplifies dependency management, promotes code reuse, and encourages collaboration within teams.</p><p>Some of the benefits of using a monorepo include:</p><ul><li><p><strong>Simplified Dependencies</strong>: A single workspace makes it easier to manage dependencies across projects.</p></li><li><p><strong>Consistent Tooling</strong>: Ensures that all projects utilize the same tooling and configuration.</p></li><li><p><strong>Atomic Changes</strong>: Allows you to make changes across multiple projects in one commit.</p></li></ul><h2 class="heading-anchor-text" id="setting-up-a-pnpm-monorepo"><span>Setting Up a pnpm Monorepo</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#setting-up-a-pnpm-monorepo">#</a></h2><h3 class="heading-anchor-text" id="prerequisites"><span>Prerequisites</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#prerequisites">#</a></h3><p>Before diving into pnpm, ensure you have Node.js and pnpm installed. You can install pnpm globally using npm with the following command:</p><div style="
          min-height: 40px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-sh" data-uniqueid="cm-m5zff8di" id="cm-m5zff8di">npm install -g pnpm</textarea></div><h3 class="heading-anchor-text" id="create-a-new-monorepo"><span>Create a New Monorepo</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#create-a-new-monorepo">#</a></h3><ol><li><p><strong>Initialize your monorepo</strong>:</p><p>Create a new directory for your monorepo and navigate to it:</p><div style="
          min-height: 64px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-sh" data-uniqueid="cm-m5zff8dj" id="cm-m5zff8dj">mkdir my-monorepo
cd my-monorepo</textarea></div></li><li><p><strong>Initialize a pnpm workspace</strong>:</p><p>Create a <code>pnpm-workspace.yaml</code> file in the root folder. This file tells pnpm which folders to treat as packages:</p><div style="
          min-height: 64px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-yaml" data-uniqueid="cm-m5zff8dk" id="cm-m5zff8dk">packages:
  - 'packages/*'</textarea></div></li><li><p><strong>Create package folders</strong>:</p><p>Now, create a <code>packages</code> directory and add some projects:</p><div style="
          min-height: 88px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-sh" data-uniqueid="cm-m5zff8dl" id="cm-m5zff8dl">mkdir packages
mkdir packages/project-a
mkdir packages/project-b</textarea></div></li><li><p><strong>Initialize each package</strong>:</p><p>Navigate to each project folder and run the following command to initialize them as separate npm packages:</p><div style="
          min-height: 136px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-sh" data-uniqueid="cm-m5zff8dm" id="cm-m5zff8dm">cd packages/project-a
pnpm init -y

cd ../project-b
pnpm init -y</textarea></div></li></ol><h3 class="heading-anchor-text" id="define-project-dependencies"><span>Define Project Dependencies</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#define-project-dependencies">#</a></h3><p>To use shared dependencies efficiently, you may want to define these in the root <code>package.json</code> file. Create a <code>package.json</code> file at the root of your monorepo:</p><div style="
          min-height: 256px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="application/json" data-uniqueid="cm-m5zff8dn" id="cm-m5zff8dn">{
  "name": "my-monorepo",
  "private": true,
  "workspaces": [
    "packages/*"
  ],
  "devDependencies": {
    "typescript": "^4.5.2"
  }
}</textarea></div><h3 class="heading-anchor-text" id="install-dependencies"><span>Install Dependencies</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#install-dependencies">#</a></h3><p>To install dependencies across all packages, run:</p><div style="
          min-height: 40px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-sh" data-uniqueid="cm-m5zff8do" id="cm-m5zff8do">pnpm install</textarea></div><p>This command traverses each defined workspace and efficiently installs shared dependencies.</p><h3 class="heading-anchor-text" id="linking-local-packages"><span>Linking Local Packages</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#linking-local-packages">#</a></h3><p>If one of the packages depends on another, you can link them seamlessly. For example, if <code>project-b</code> relies on <code>project-a</code>, you would modify <code>project-b/package.json</code>:</p><div style="
          min-height: 184px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="application/json" data-uniqueid="cm-m5zff8dq" id="cm-m5zff8dq">{
  "name": "project-b",
  "version": "1.0.0",
  "dependencies": {
    "project-a": "workspace:*"
  }
}</textarea></div><p>Now, when you run <code>pnpm install</code> in the root directory, it automatically links <code>project-a</code> into <code>project-b</code>.</p><h2 class="heading-anchor-text" id="working-with-scripts"><span>Working with Scripts</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#working-with-scripts">#</a></h2><p>Creating scripts in a monorepo allows you to run tasks across multiple projects. In your root <code>package.json</code>, include a script that runs a command in each project:</p><div style="
          min-height: 136px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="application/json" data-uniqueid="cm-m5zff8dr" id="cm-m5zff8dr">{
  "scripts": {
    "build": "pnpm --filter ./packages/* run build"
  }
}</textarea></div><p>Now, simply execute:</p><div style="
          min-height: 40px;
          max-width: 100%;
            "><textarea data-iscodemirror="true" class="d-none" data-mode="text/x-sh" data-uniqueid="cm-m5zff8ds" id="cm-m5zff8ds">pnpm run build</textarea></div><p>This will run the <code>build</code> script in every package folder.</p><h2 class="heading-anchor-text" id="conclusion"><span>Conclusion</span><a class="d-inline heading-anchor" title="Direct link to heading" href="#conclusion">#</a></h2><p>Navigating a pnpm monorepo may seem daunting initially, but the efficiency and organization it brings to your projects are invaluable. Whether you’re managing a small team project or a large enterprise application, pnpm will help streamline your workflow, improve dependency management, and enhance collaboration.</p><p>Jump into your monorepo adventure today, and harness the potential of pnpm for your projects!</p>

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Nate Murray

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Sean Amarasinghe

Ken Chan

In the realm of modern web development, managing dependencies across multiple projects can be tedious. Enter pnpm, a fast and efficient package manager for JavaScript that excels in managing monorepos. This tutorial will guide you through the essentials of setting up a pnpm monorepo and optimizing…

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