Sharing input and output type schemas

Is there a pattern or templating support to allow input and output types to share a consistent schema in the schema definition? I know that GraphQL doesn't natively support this but in some languages (TypeScript) people have worked around it using templating techniques.

Specifically when I want to ensure a consistent schema across an input and output types such as:

```
type WidgetConfig {
enableWidget1: Boolean!
enableWidget2: Boolean!
}

input WidgetConfigInput {
enableWidget1: Boolean!
enableWidget2: Boolean!
}

mutation {
configureWidget(config: WidgetConfigInput!): WidgetConfig
}
```