> ## Documentation Index
> Fetch the complete documentation index at: https://bazel-flags-doc.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# config\_common

Functions for Starlark to interact with Blaze's configurability APIs.

## Members

* [FeatureFlagInfo](#FeatureFlagInfo)
* [toolchain\_type](#toolchain_type)

## FeatureFlagInfo

```
Provider config_common.FeatureFlagInfo
```

The key used to retrieve the provider containing config\_feature\_flag's value.

## toolchain\_type

```
toolchain_type config_common.toolchain_type(name, *, mandatory=True)
```

Declare a rule's dependency on a toolchain type.

### Parameters

ParameterDescription`name`[string](../core/string.html); or [Label](../builtins/Label.html);
required

The toolchain type that is required.
`mandatory`[bool](../core/bool.html);
default is `True`

Whether the toolchain type is mandatory or optional.