tsdown

Fast TypeScript/JavaScript library bundler powered by Rolldown with multi-format output and type declaration generation. Blazing-fast bundler for TypeScript/JavaScript libraries powered by Rolldown and Oxc. Export an array for multiple build configurations: Use functions for dynamic configuration: Use glob patterns to build multiple packages: Always generate type declarations for TypeScript libraries: Externalize dependencies to avoid bundling unnecessary code: Use tree shaking for optimal bundle size: Enable minification for production builds: Add shims for better ESM/CJS compatibility: Auto-generate package.json exports : Use watch mode during development: Preserve structure for utilities with many files: Validate packages in CI before publishing: - Supports bundling to ESM, CJS, IIFE, and UMD formats with automatic peer dependency externalization and tree shaking - Generates TypeScript declaration files (.d.ts) with source map and compiler option control, plus experimental CSS pipeline with preprocessor and PostCSS support - Includes watch mode, minification, source maps, unbundle mode for preserving directory structure, and framework-specific recipes for React, Vue, Solid, and Svelte - Offers CLI commands, programmatic API, lifecycle hooks, workspace/monorepo support, and direct Rolldown option passthrough for advanced customization - Provides migration tooling from tsup...