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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

Run your tests with the Bun test runner Run tests in watch mode with Bun Migrate from Jest to Bun's test runner Mock functions in `bun test`Spy on methods in `bun test`Set the system time in Bun's test runner Use snapshot testing in `bun test`Update snapshots in `bun test`Generate code coverage reports with the Bun test runner Set a code coverage threshold with the Bun test runner Selectively run tests concurrently with glob patterns Skip tests with the Bun test runner Mark a test as a "todo" with the Bun test runner Set a per-test timeout with the Bun test runner Bail early with the Bun test runner Re-run tests multiple times with the Bun test runner Using Testing Library with Bun Write browser DOM tests with Bun and happy-dom import, require, and test Svelte components with bun test

File SystemTest Runner

Write browser DOM tests with Bun and happy-dom

Use Happy DOM to write browser tests with Bun's test runner. Happy DOM implements mocked versions of browser APIs like document and location .

Using Testing Library with Bun

You can use Testing Library with Bun's test runner.

import, require, and test Svelte components with bun test

Use Bun's Plugin API to add a custom loader for .svelte files, and the test.preload option in bunfig.toml to load it before your tests run.