Get Started

Welcome to Bun Installation Quickstart TypeScript TypeScript 6 and 7

Watch Mode Debugging REPL bunfig.toml File Types Module Resolution JSX Auto-install Plugins File System Router

Cookies File I/O Streams Binary Data Archive SQL SQLite S3 Redis Workers Environment Variables Shell Spawn WebView Cron Node-API FFI C Compiler Transpiler CSRF Protection Secrets Console TOML YAML Markdown JSON5 JSONL HTMLRewriter Image Hashing Glob Semver Color Utils Globals Bun APIs Web APIs Node.js Compatibility

Test runner

Bun's fast, built-in, Jest-compatible test runner with TypeScript support, lifecycle hooks, mocking, and watch mode

On this page

Run tests CI/CD integration GitHub Actions How to install bun in a GitHub Actions workflow JUnit XML reports (GitLab, etc.)Timeouts Concurrent test execution --concurrent flag --max-concurrency flag test.concurrent test.serial Retry failed tests Rerun tests Randomize test execution order Reproducible random order with --seed Bail out with --bail Watch mode Lifecycle hooks Mocks Snapshot testing UI & DOM testing Performance AI Agent Integration Environment Variables Behavior Execution Control Test Filtering Reporting Coverage Snapshots Examples