# has_envs

## Function

Determine whether the specified name exists in the system environment.

## Syntax

```bt
has_envs(name)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| name | String | No | '' | The name of the system to check. |

## Return value

| Type | Description |
| ------ | ------ |
| Bool | Returns true if there is a system function, library constructor, or system constant. |

## Example

```bt
result = has_envs('fs')

// Output: true
print result
```

## Notes

- Can be used to check whether the standard library entry exists.