📦 Rollup Config Generator

What Can the Rollup Config Generator Do?

The Rollup Config Generator is a free online tool that helps developers quickly generate rollup.config.js files through a visual interface. It supports entry/output configuration, plugin system, external dependency management, multi-format output, and Tree Shaking settings. All computation happens on your device — Entry File, Output Format and other inputs stay in your browser — no Node.js or Rollup CLI installation required.

Core Features

• Multi-Format Output: Supports ESM, CommonJS, UMD, IIFE, AMD, and SystemJS output formats for different use cases
• Plugin System: One-click enable of node-resolve, commonjs, babel, typescript, terser, and json plugins with auto-initialization
• External Dependencies: Declare external dependencies and global mappings (globals) for UMD/IIFE browser global variable binding
• Source Maps: Inline and hidden source map modes for development debugging
• Tree Shaking: Native ES Module-based Tree Shaking that automatically removes unused code

How to Use

1. Configure entry file path and output file path

2. Select output format (ESM/CJS/UMD/IIFE/AMD/SystemJS)

3. Check the Rollup plugins you need (resolve, commonjs, babel, typescript, etc.)

4. For library bundling, configure external dependencies and global mappings

5. Set up source maps, strict mode, and other advanced options

6. Click "Generate Config" to preview, then copy or download to your project root

Use Cases

Case 1: npm Package Development

Bundle npm packages with dual ESM+CJS output formats, ensuring support for both import and require in consuming projects.

Case 2: Component Library Building

Build React/Vue/Svelte component libraries with Rollup, using babel and typescript plugins for JSX/TSX processing.

Case 3: Browser Library Distribution

Develop JavaScript libraries for direct browser use with UMD output format and global variable mappings for external dependencies.

Case 4: Bundle Size Optimization

Leverage Rollup's Tree Shaking to eliminate dead code and use the terser plugin for further output compression.

Technical Background

Rollup is a module bundler designed specifically for ES Modules, renowned for its excellent Tree Shaking capabilities. Unlike Webpack, Rollup is optimized for library bundling, producing cleaner, smaller output files. Rollup 4 introduces Import Attributes and official JSON module support. Key concepts: input (entry point), output (bundle configuration), plugins (transformation pipeline), external (peer dependencies), and globals (global variable name mapping for UMD/IIFE bundles). @rollup/plugin-node-resolve enables resolution from node_modules, while @rollup/plugin-commonjs converts CommonJS modules to ESM format.