tsdown

To bundle a TypeScript library into multiple formats like ESM and CJS, you can use a fast bundler that compiles source entry files into ESM, CJS, IIFE, and UMD outputs. This ensures compatibility across different JavaScript environments with minimal configuration.

Automating .d.ts type declaration file generation for a TypeScript project is handled by bundlers with built-in declaration support. The tool fully automates generating these files during the build process, eliminating the need for manual type definition management.

Yes, this TypeScript bundler works in monorepos and CI/CD environments through CI-aware settings and advanced configuration options. It supports dependency externalizing and custom configurations, ensuring reliable, fast builds across complex professional software engineering workflows.

To externalize dependencies or create a whitelist when building a JavaScript library, you can utilize custom dependency configurations within the bundler. This allows precise dependency control by externalizing specific packages while bundling others directly into the final output.

Yes, you can use Vite plugins and unplugin with this library bundler because it is built on Rolldown and Vite dependencies. It supports advanced configuration and plugin support, allowing you to extend the build process with custom CSS handling and other workflows.

Choosing a Rolldown-based bundler over other tools provides high-speed bundling and multi-format output for TypeScript libraries. It combines rapid compilation with automated declaration generation and advanced dependency management, differentiating it from standard category-level alternatives.