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Added note on env vars (#31237)

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This PR adds a note on how to access env vars in middleware

## Bug

- [x] Related issues linked using fixes: #30612
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`


Co-authored-by: Steven <229881+styfle@users.noreply.github.com>
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Rich Haines 2021-11-23 21:55:17 +01:00 committed by GitHub
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19
docs/api-reference/next/server.md
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@ -25,7 +25,7 @@ The function can be a default export and as such, does **not** have to be named
The `NextRequest` object is an extension of the native [`Request`](https://developer.mozilla.org/en-US/docs/Web/API/Request) interface, with the following added methods and properties:
- `cookies` - Has the cookies from the `Request`
- `cookie` - Has the cookies from the `Request`
- `nextUrl` - Includes an extended, parsed, URL object that gives you access to Next.js specific properties such as `pathname`, `basePath`, `trailingSlash` and `i18n`
- `geo` - Has the geo location from the `Request`
- `geo.country` - The country code
@ -88,6 +88,23 @@ The introduction of the `307` status code means that the request method is prese
The `redirect()` method uses a `307` by default, instead of a `302` temporary redirect, meaning your requests will _always_ be preserved as `POST` requests.
### How do I access Environment Variables?
`process.env` can be used to access [Environment Variables](/docs/basic-features/environment-variables.md) from Middleware. These are evaluated at build time, so only environment variables _actually_ used will be included.
Any variables in `process.env` must be accessed directly, and **cannot** be destructured:
```ts
// Accessed directly, and not destructured works. process.env.NODE_ENV is `"development"` or `"production"`
console.log(process.env.NODE_ENV)
// This will not work
const { NODE_ENV } = process.env
// NODE_ENV is `undefined`
console.log(NODE_ENV)
// process.env is `{}`
console.log(process.env)
```
## Related
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