> For the complete documentation index, see [llms.txt](https://cuhhub.gitbook.io/noir/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cuhhub.gitbook.io/noir/api-reference/typechecking.md).

# TypeChecking

**Noir.TypeChecking**: `table`

A module of Noir for checking if a value is of the correct type.

This normally would be a library, but libraries need to use this and libraries are meant to be independent of each other.

***

```lua
Noir.TypeChecking:Assert(origin, parameterName, value, ...)
```

Raises an error if the value is not any of the provided types.

This supports checking if a value is a specific class or not too.

### Parameters

* `origin`: string - The location of the thing (method, function, etc) that called this so the user can find out where something went wrong
* `parameterName`: string - The name of the parameter that is being type checked
* `value`: any
* `...`: NoirTypeCheckingType

***

```lua
Noir.TypeChecking:AssertMany(origin, parameterName, values, ...)
```

Raises an error if any of the provided values are not any of the provided types.

### Parameters

* `origin`: string - The location of the thing (method, function, etc) that called this so the user can find out where something went wrong
* `parameterName`: string - The name of the parameter that is being type checked
* `values`: table\<integer, any>
* `...`: NoirTypeCheckingType

***

```lua
Noir.TypeChecking:_FormatTypes(types)
```

Format required types for an error message.

Used internally.

### Parameters

* `types`: table\<integer, NoirTypeCheckingType>

### Returns

* `string`