<|fim_im_end|>` The article discusses the use of Apollo's GraphQL codegen feature to generate TypeScript types for GraphQL operations in an Apollo Client project. The author, Khalil Stemmler, explains that good design is primarily discoverability and feedback, and how typed languages like TypeScript provide compile-time types as a form of feedback. He argues that using Apollo's codegen feature can help developers build client-side GraphQL applications more efficiently by generating TypeScript types for queries written in an Apollo Client project. The article provides a step-by-step guide on how to use the codegen feature, including installing dependencies, downloading the schema, and generating types for remote and client-only operations. The author also discusses how to extend the graph with local schema files and save the codegen command as an NPM script. Overall, the article aims to help developers generate TypeScript types for their GraphQL operations more efficiently and write fewer bugs.