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agent-skills/skills/turborepo/references/environment/modes.md
Jason Woltje f5792c40be feat: Complete fleet — 94 skills across 10+ domains
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-16 16:27:42 -06:00

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# Environment Modes
Turborepo supports different modes for handling environment variables during task execution.
## Strict Mode (Default)
Only explicitly configured variables are available to tasks.
**Behavior:**
- Tasks only see vars listed in `env`, `globalEnv`, `passThroughEnv`, or `globalPassThroughEnv`
- Unlisted vars are filtered out
- Tasks fail if they require unlisted variables
**Benefits:**
- Guarantees cache correctness
- Prevents accidental dependencies on system vars
- Reproducible builds across machines
```bash
# Explicit (though it's the default)
turbo run build --env-mode=strict
```
## Loose Mode
All system environment variables are available to tasks.
```bash
turbo run build --env-mode=loose
```
**Behavior:**
- Every system env var is passed through
- Only vars in `env`/`globalEnv` affect the hash
- Other vars are available but NOT hashed
**Risks:**
- Cache may restore incorrect results if unhashed vars changed
- "Works on my machine" bugs
- CI vs local environment mismatches
**Use case:** Migrating legacy projects or debugging strict mode issues.
## Framework Inference (Automatic)
Turborepo automatically detects frameworks and includes their conventional env vars.
### Inferred Variables by Framework
| Framework | Pattern |
| ---------------- | ------------------- |
| Next.js | `NEXT_PUBLIC_*` |
| Vite | `VITE_*` |
| Create React App | `REACT_APP_*` |
| Gatsby | `GATSBY_*` |
| Nuxt | `NUXT_*`, `NITRO_*` |
| Expo | `EXPO_PUBLIC_*` |
| Astro | `PUBLIC_*` |
| SvelteKit | `PUBLIC_*` |
| Remix | `REMIX_*` |
| Redwood | `REDWOOD_ENV_*` |
| Sanity | `SANITY_STUDIO_*` |
| Solid | `VITE_*` |
### Disabling Framework Inference
Globally via CLI:
```bash
turbo run build --framework-inference=false
```
Or exclude specific patterns in config:
```json
{
"tasks": {
"build": {
"env": ["!NEXT_PUBLIC_*"]
}
}
}
```
### Why Disable?
- You want explicit control over all env vars
- Framework vars shouldn't bust the cache (e.g., analytics IDs)
- Debugging unexpected cache misses
## Checking Environment Mode
Use `--dry` to see which vars affect each task:
```bash
turbo run build --dry=json | jq '.tasks[].environmentVariables'
```