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Fix module env usage tip #1423

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Jun 6, 2024
Merged

Fix module env usage tip #1423

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c9d6a40
Fix module env usage tip
Kissaki May 29, 2024
e51b994
Improve wording
Kissaki May 29, 2024
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Fix module env usage tip 
Fixes #1024

Use a more concise example, similar to the previous one.

Add usage example with proof.
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@Kissaki
Kissaki committed May 29, 2024
commit c9d6a40864c236b0925b3d3c74e987523a33fa93
26 changes: 16 additions & 10 deletions book/modules.md
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Expand Up @@ -292,22 +292,28 @@ hello Arthur, King of the Britons!
```

::: tip
You can put a complex code defining your environment without polluting the namespace of the module, for example:
The module implementation can use its own scoped environment variables without them bleeding into users scope. For example:

```nu
def tmp [] { "tmp" }
def other [] { "other" }
# greetings-local.nu

let len = (tmp | str length)

load-env {
OTHER_ENV: (other)
TMP_LEN: $len
}
export def hello [] {
$env.MYNAMELOCAL = "Arthur, King of the Britons"
$"hello ($env.MYNAMELOCAL)"
}
```

Only `$env.TMP_LEN` and `$env.OTHER_ENV` are preserved after evaluating the `export-env` module.
```nu
> use greetings-local.nu

> $env.MYNAMELOCAL
Error: nu::shell::column_not_found
[…]

> greetings-local hello
hello Arthur, King of the Britons!
```

:::

## Caveats
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