Native code generation at Facebook

The native code generation tools at Facebook are designed to help developers build productivity-enhancing tools on top of GraphQL. These tools take a description of the type system and a set of GraphQL queries as an input, and output a set of response models and query requests. The tools use a fragment-based model approach, which allows for more modular and maintainable code. This approach enables developers to easily catch fetching errors at compile time, rather than runtime. The tools are built on top of the open-source JavaScript GraphQL reference implementation and have been used by Facebook's engineers since 2012.