Typed Resolvers with GraphQL Code Generator
Write resolvers with correct input and return types.
The Resolver Typing Problem
GraphQL resolvers are plain functions, but without typed signatures it's easy to return wrong shapes. Codegen generates resolver types that enforce correct return values.
// Without typed resolvers — any type allowed
const userResolver = async (_, { id }) => fetchUser(id);Adding the Resolvers Plugin
Install and configure @graphql-codegen/typescript-resolvers to generate resolver map types.
npm install --save-dev @graphql-codegen/typescript-resolversAll lessons in this course
- GraphQL Schema to TypeScript Types
- Typed Resolvers with GraphQL Code Generator
- Typed GraphQL Client with Apollo and urql
- End-to-End Type Safety: Schema First Workflow