Claude Code for Unbuild Build Tool Workflow Guide

Unbuild is a modern, modular build system designed for JavaScript and TypeScript libraries. It provides a standardized way to create builds with automatic entry point generation, TypeScript support, and plugin-based extensibility. When combined with Claude Code, you can automate the entire build configuration process, from initial setup to publishing готовые пакеты.

This guide shows you how to use Claude Code to work with Unbuild efficiently, automate repetitive tasks, and create maintainable build configurations.

Understanding Unbuild Fundamentals

Unbuild uses a convention-over-configuration approach where your build behavior is defined through a build.config.ts file in your project root. The tool automatically handles:

TypeScript compilation and type declarations
Multiple output formats (ESM, CJS, DTS)
Entry point discovery and generation
Bundle optimization

Claude Code can help you scaffold new Unbuild projects, generate configuration files, and maintain build configurations over time.

Setting Up Unbuild with Claude Code

The fastest way to start a new Unbuild project is to let Claude Code scaffold it for you. Here’s a practical workflow:

# Create a new directory for your library
mkdir my-awesome-library
cd my-awesome-library

# Initialize with npm and install Unbuild
npm init -y
npm install -D unbuild

After this, you can ask Claude Code to generate your build.config.ts:

// build.config.ts
import { defineBuildConfig } from 'unbuild'

export default defineBuildConfig({
  entries: [
    'src/index'
  ],
  clean: true,
  declaration: true,
  rollup: {
    emitCJS: true
  }
})

Claude Code can generate this configuration automatically based on your project’s requirements. Simply describe your needs, and the AI will create the appropriate configuration.

Automating Entry Point Generation

One of Unbuild’s most powerful features is automatic entry point discovery. When you structure your project correctly, Unbuild automatically generates multiple entry points from your source files.

Recommended Project Structure

my-library/
├── src/
│   ├── index.ts        # Main entry
│   ├── utils/
│   │   ├── format.ts   # Becomes /utils/format
│   │   └── parse.ts    # Becomes /utils/parse
│   └── core/
│       └── engine.ts   # Becomes /core/engine
├── build.config.ts
└── package.json

With this structure, Unbuild automatically generates:

dist/index.js - Main entry
dist/utils/format.js - Utils formatter
dist/utils/parse.js - Utils parser
dist/core/engine.js - Core engine

You can ask Claude Code to create this structure for you:

# Tell Claude: "Create a new Unbuild project with src/index.ts, src/utils/ folder, and src/core/ folder with example files"

Using Claude Code to Maintain Build Configurations

As your library grows, your build configuration needs to evolve. Claude Code can help you:

Adding New Entry Points

When you add new modules to your library, update the build config:

// Claude: Add 'src/helpers' entry to the build config
import { defineBuildConfig } from 'unbuild'

export default defineBuildConfig({
  entries: [
    'src/index',
    'src/utils',
    'src/core',
    'src/helpers'  // New entry
  ],
  clean: true,
  declaration: true,
  rollup: {
    emitCJS: true
  }
})

Configuring TypeScript Strictly

For production libraries, you want strict TypeScript settings:

import { defineBuildConfig } from 'unbuild'

export default defineBuildConfig({
  entries: [
    'src/index',
    'src/utils',
    'src/core'
  ],
  clean: true,
  declaration: {
    strict: true,
    rollupTypes: true
  },
  rollup: {
    emitCJS: true,
    inlineDependencies: false
  }
})

Integrating with TypeScript Projects

When your Unbuild project is part of a larger monorepo or TypeScript workspace, Claude Code can help configure proper TypeScript integration:

Ensure tsconfig.json is properly configured - Set declaration: true and declarationMap: true
Configure path mappings - Use paths in tsconfig for clean imports
Set up references - Use TypeScript project references for faster builds

Claude Code can audit your configuration and suggest improvements:

# Ask Claude: "Audit my build.config.ts and suggest improvements for a production library"

Publishing Your Unbuild Package

Once your build is configured, publishing is straightforward:

# Build the package
npx unbuild

# Publish to npm
npm publish

Claude Code can create a release script in your package.json:

{
  "scripts": {
    "build": "unbuild",
    "prepublishOnly": "npm run build",
    "release": "np"
  }
}

Best Practices for Unbuild with Claude Code

1. Version Management

Always keep your dependencies updated. Ask Claude Code periodically to check for updates:

# Tell Claude: "Check for outdated dependencies in this Unbuild project"

2. Test Your Build Output

Before publishing, verify your build works:

# Build and test locally
npm run build
npm pack
npm install ./your-package-*.tgz

3. Use GitHub Actions

Automate your CI/CD with GitHub Actions:

name: Build and Test
on: [push, pull_request]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
      - run: npm ci
      - run: npm run build
      - run: npm test

Claude Code can generate this workflow file for you automatically.

Conclusion

Combining Claude Code with Unbuild creates a powerful workflow for JavaScript and TypeScript library development. Claude Code can scaffold projects, generate configurations, maintain build settings, and even create CI/CD workflows—allowing you to focus on writing code rather than managing build tooling.

Start small: create a new Unbuild project, let Claude generate the initial configuration, then iterate as your library grows. The combination of AI assistance and modern tooling makes library development more accessible than ever.

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