TypeScript GraphQL Code Generator – Generate GraphQL Types with Apollo Codegen Tutorial

TypeScript GraphQL Code Generator – Generate GraphQL Types with Apollo Codegen Tutorial

TypeScript GraphQL Code Generator – Generate GraphQL Types with Apollo Codegen Tutorial. The author of “The Design of Everyday Things” has a philosophy for what he believes constitutes good design. For developers building client-side GraphQL applications using Apollo Client and React, compiling it with TypeScript is a good idea.

Don Norman, the author of “The Design of Everyday Things” has a philosophy for what he believes constitutes good design. Don says that good design is primarily discoverability and feedback.

For example, when you encounter something new (like, a new codebase), how quickly can you discover what you can do (discoverability)? And then after you’ve taken some action, how immediately do you get to know if what you did was correct (feedback)?

Typed languages like TypeScript give us compile-time types, and types act as an excellent form of feedback. They let us know if what we’re attempting to do is going to work — and they let us know immediately.

For developers building client-side GraphQL applications using Apollo Client and React, compiling it with TypeScript is a good idea. But without compile-time types on our GraphQL operations, we have to wait until we execute our queries and mutations to tell if we’re doing something wrong.

In this post, you’ll learn how to use Apollo’s GraphQL codegen to generate TypeScript types for GraphQL operations in your Apollo Client project.

Apollo’s GraphQL Codegen

The Apollo CLI (which lives on GitHub at  apollographql/apollo-tooling) contains a collection of helpful utilities to assist us with maintaining GraphQL applications in production.

One of the tools from the CLI is the GraphQL codegen feature. It lets us:

  1. Download any GraphQL schema using a GraphQL endpoint
  2. Generate TypeScript types for queries written in an Apollo Client project (given a valid GraphQL schema)

And that’s exactly what we’ll do. Let’s get started.

Prerequisites

  • You’re familiar with the command line
  • You have Node.js (8+) installed
  • You know how to build a full-stack GraphQL application. If not,  check out this blog post for our recommended tutorials.

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