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title: Reusing Types from DataWeave Modules
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# Reusing Types from DataWeave Modules

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

To reuse types declared in other DataWeave modules, use the `import` directive:

DataWeave Module (`dw/Weather.dwl`):

```dataweave
%dw 2.0
type Weather = "cloudy" | "sunny" | "rainy" | "stormy"
type DetailedWeather = {temperature: Number, weather: Weather}
```

You can use those imported types as any other type in DataWeave, as constraints for variables and
functions or for pattern matching and checking types at runtime:

DataWeave Script:

```dataweave
%dw 2.0
output json
import * from dw::Weather


fun weatherMessage(todayWeather: Weather) =
    "The weather for today is: " ++ todayWeather
var worstPossibleWeather: DetailedWeather = {temperature: -10, weather: "stormy"}
---
{
    a: weatherMessage("sunny"),
    b: worstPossibleWeather.weather is Weather
}
```

## See Also

- [Create Custom Modules and Mappings](https://docs.mulesoft.com/dataweave/latest/dataweave-create-module)