It would quickly get out of hand if we had to create TypeScript types for every type in our GraphQL schema. Luckily there are a couple packages from graphql-codegen that we can use to make our lives easier.

We'll create a codegen.yml file where we'll specify our GraphQL schema and choose the location of the types file we want to generate based on the schema.

Then we can create a script in our package.json that runs the codegen.

For more on using TypeScript with AppSync Lambda Resolvers, check out Benoît Bouré blog post: How to use TypeScript with AppSync Lambda Resolvers