Mixing Typescript and GraphQL Code Generator

Mixing Typescript and GraphQL Code Generator

Automate your Typescript’s Type generation

Automate your GraphQL Typescript’s Type generation

GraphQL is an open-source data query and manipulation language for APIs, and a runtime for fulfilling queries with existing data.

We no longer have to play the guessing game, as we did with REST. It’s strongly-typed. Given a query, tooling can ensure that the query is both syntactically correct and valid within the GraphQL type system before execution.

As Typescript is a typed language it’s a perfect match for GraphQL. By using them together you are making sure that the right types are consistent across your BE and FE.

Why do we have to manually define our Typescript interfaces then? Manual work means human errors can happen. With that motivation graphql-codegen was born.

GraphQL Code Generator is a CLI tool that can generate TypeScript typings out of a GraphQL schema. When we develop a GraphQL backend, there would be many instances where we would find ourselves writing the same things which are already described by the GraphQL schema, only in a different format; for example: resolver signatures, MongoDB models, Angular services etc.

graphql-code-generator.com

In summary: it’s a CLI tool that will do all the heavy lifting for us. Let’s take a deep dive into it and see how easy it is to use it to produce our first query using TypescriptReact, and Apollo.

GraphQL Code Generator Setup

Let’s start by installing the GraphQL library:

yarn add graphql

npm install — save graphql

Next, we need to add the cli:

yarn add -D @graphql-codegen/cli

npm install --save-dev @graphql-codegen/cli

programming javascript graphql typescript

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