> For the complete documentation index, see [llms.txt](https://v1.docs.blueberry.garden/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://v1.docs.blueberry.garden/developer-guides/contracts/utils.md).

# Utils

- [BlueBerryConst](https://v1.docs.blueberry.garden/developer-guides/contracts/utils/blueberryconst.md)
- [BlueBerryErrors](https://v1.docs.blueberry.garden/developer-guides/contracts/utils/blueberryerrors.md)
- [EnsureApprove](https://v1.docs.blueberry.garden/developer-guides/contracts/utils/ensureapprove.md)
- [ERC1155NaiveReceiver](https://v1.docs.blueberry.garden/developer-guides/contracts/utils/erc1155naivereceiver.md)