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Adds an optional `extensions` parameter to `strawberry.federation.field`, with default value `None`. The key is passed through to `strawberry.field`, so the functionality is exactly as described [here](https://strawberry.rocks/docs/guides/field-extensions).
Example:
python
strawberry.federation.field(extensions=[InputMutationExtension()])
Contributed by [Bryan Ricker](https://github.com/bricker) via [PR #3239](https://github.com/strawberry-graphql/strawberry/pull/3239/)