···433433```
434434:::
435435436436-:::warning
437437-Vitest transforms all `import.meta.env` calls into `process.env`, so they can be easily changed at runtime. Node.js only supports string values as env parameters, while Vite supports several built-in envs as boolean (namely, `SSR`, `DEV`, `PROD`). To mimic Vite, set "truthy" values as env: `''` instead of `false`, and `'1'` instead of `true`.
438438-439439-But beware that you cannot rely on `import.meta.env.DEV === false` in this case. Use `!import.meta.env.DEV`. This also affects simple assigning, not just `vi.stubEnv` method.
440440-:::
441441-442436## vi.unstubAllEnvs
443437444438- **Type:** `() => Vitest`