ESM Unit vs Vitest
ESM Unit
github.com
Vitest
vitest.devSide by side
| Figure | ESM Unit | Vitest |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| Plans published | 0 | 1 |
| Spec score · JavaScript Testing Frameworks | 7.3 (#15) | 7.6 (#12) |
| Coverage | It supports per-file code coverage reports and configurable coverage thresholds. | Vitest supports code coverage through V8 or Istanbul. |
| Requirements | ESM Unit requires Node 18 LTS or later and test code that runs in current browsers as native ECMAScript modules without transpilation. | The getting started guide says Vitest requires Vite 6.4.0 or later and Node 22.12.0 or later. |
| Support | The project README invites users to open an issue or pull request and says it welcomes contributions. | The guide directs users needing help to the Vitest Discord community and GitHub Discussions. |
| Watch mode | The --watch option reruns tests when files change, and cannot be used at the same time as --debug. | Watch mode reruns tests related to changed source or test files. |
Plans
In their own words
Vitest
Vitest is a free and open-source testing framework powered by Vite, though it can also run without Vite. It can reuse Vite configuration, plugins, resolvers, and transform pipelines. Jest-compatible APIs cover assertions, snapshots, and mocking, which can support migration from Jest. Watch mode reruns tests related to changed source or test files, and TypeScript, JSX, and ES modules work out of the box. Browser Mode runs tests in a browser and supports Playwright and WebdriverIO providers. Component testing covers Vue, React, Svelte, Lit, Marko, and other frameworks. Vitest supports coverage through V8 or Istanbul, benchmarking powered by Tinybench, parallel execution, parameterized cases, and property-based checks. An official Visual Studio Code extension is available, and the framework can be tried in StackBlitz without local installation. The listed requirements are Vite 6.4.0 or later and Node 22.12.0 or later. Help is available through the Vitest Discord community and GitHub Discussions.