Bun

Founded 2022

Execute, bundle, test, and manage JavaScript and TypeScript projects in one environment

You can use Bun to run JavaScript and TypeScript applications directly without manual compilation steps. It acts as an execution environment, package manager, bundler, and test runner inside a single setup. You can replace Node.js, npm, Jest, and Vite to speed up local development and continuous integration pipelines. It includes built-in support for WebSockets, SQLite, PostgreSQL, Redis, and S3 file operations. In addition, you can compile applications into standalone executables for deployment across different operating systems without requiring users to install separate dependencies.

What Bun does

Install project dependencies from npm registriesRun TypeScript scripts without configuring build toolsExecute test suites with coverage and snapshot testingBundle frontend assets into static production filesPackage applications into standalone executable binariesServe HTTP traffic and manage WebSocket connectionsRuns JavaScript and TypeScript directly without extra transpilation stepsInstalls dependencies up to thirty times faster than traditional npm packagesProvides built-in native support for PostgreSQL, Redis, and S3 APIsCompiles projects into single-file binary executables across operating systemsIncludes a built-in test runner compatible with standard Jest syntaxOffers a native development server and bundler with hot module replacementHandles high-throughput WebSocket servers with built-in publish and subscribe support