A tale of two type systems
Underlying many of the benefits of GraphQL is the fact that it is strongly typed. Servers define a schema, a type system that precisely describes what data is available to clients. And clients define queries specifying the structure they want a response to have in terms of this type system. This means that even though responses are usually transported as weakly-typed JSON, result types are in fact fully predictable. For each field, we have the type information to know exactly what data to expect. The schema thus acts as a strongly typed and self-documenting contract between client and server.

#graphql #swift #graphql types #mapping