GraphQL Code Generator v5 Roadmap

[theguild-bot]

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At The Guild, we’ve decided to work as much as possible in public; that’s why we are opening the roadmaps for all of our projects.

The goals for this are:

1. So you will know what we are working on, what we see as a higher priority, and know what to expect from our projects in the future
2. So you can share your opinions and thoughts about what we do and influence our decisions
3. So you can join us and contribute to our efforts!

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Before laying down the roadmap of GraphQL Code Generator v3, we would like to thank all of you for being so many who use codegen daily and for contributing to making it such a complete project! 🚀

While some people judge that GraphQL is difficult, GraphQL Code Generator v3 aims to change that perspective by providing a unified configuration along with a smaller and simpler generated code.

By providing a unified package and configuration for all client-side use cases, all existing and future plugin alternatives will be moved to community repos.

Let’s now cover these changes in detail.

A unified configuration and package for all GraphQL clients

Most of the existing client-side plugins (typescript-react-apollo, typescript-react-query, etc) rely on the generation of hooks or SDKs that wrap the underlying GraphQL Client in a type-safe way.

However, the generation of hooks or SDK code brings many downsides:

• an unnecessary increase of the final bundle size
• misalignment between the generated hooks signature and the underlying GraphQL Client
• inconsistencies of configuration options and preset compatibility across packages (ex: near-operation-file compatibility)

To make GraphQL code generation great and simple, the v3 version will introduce two major changes:

• a new unique preset for all GraphQL clients, which include better developer experience, smaller bundle size, stronger typings, and easier-to-follow best practices
• a TypeScript-first configuration file that will allow configuration autocompletion

Here is how you can already configure codegen for all GraphQL Clients:

import { CodegenConfig } from '@graphql-codegen/cli'

const config: CodegenConfig = {
  schema: 'http://localhost:4000/graphql',
  documents: ['src/**/*.tsx'],
  generates: {
    './src/gql/': {
      preset: 'client',
      plugins: []
    }
  }
}

export default config

The client preset comes with a simple opinionated configuration and a lightweight types-only generation.

To try the new client preset, please install the following dependencies:

yarn add graphql
yarn add -D typescript
yarn add -D @graphql-codegen/cli
yarn add -D @graphql-codegen/client-preset

First, start GraphQL Code Generator in watch mode:

yarn graphql-codegen --watch

Using GraphQL Code Generator will type your GraphQL Query and Mutations as you write them ⚡️

Now, each query or mutation written with the generated graphql() function will be automatically typed!

For example, with Apollo Client (React):

import React from 'react';
import { useQuery } from '@apollo/client';
import { graphql } from './gql/gql';

import Film from './Film';

// here, `allFilmsWithVariablesQueryDocument` is fully typed!
const allFilmsWithVariablesQueryDocument = graphql(/* GraphQL */ `
  query allFilmsWithVariablesQuery($first: Int!) {
    allFilms(first: $first) {
      edges {
        node {
          ...FilmItem
        }
      }
    }
  }
`);

function App() {
	// Most GraphQL Clients know how to deal with typed GraphQL documents,
	//   providing typed data and typed variables
  const { data } = useQuery(allFilmsWithVariablesQueryDocument, { variables: { first: 10 } });
  return (
    <div className="App">
      {data && <ul>{data.allFilms?.edges?.map((e, i) => e?.node && <Film film={e?.node} key={`film-${i}`} />)}</ul>}
    </div>
  );
}

export default App;

Thanks to work made to integrate TypeDocumentNode (the underlying plugin used by preset: client) with most of the popular GraphQL clients, you no longer need hooks or SDK, simple GraphQL documents works!

We believe that the preset: client approach is the way to get the best of TypeScript and GraphQL by:

• reducing the size of the generated bundle
• only the graphql() function needs to be imported (no type, hooks, document imports)
• removing layers between your application and your chosen GraphQL Client
• providing stronger typings that will stay aligned with your chosen GraphQL Client
• offering you the best component isolation design by leveraging Fragment Masking

Finally, this new preset: client has been properly tested on all popular GraphQL clients across most frameworks:

• React
  • @apollo/client (since 3.2.0, not when using React Components (<Query>))
  • @urql/core (since 1.15.0)
  • @urql/preact (since 1.4.0)
  • urql (since 1.11.0)
  • graphql-request (since 5.0.0)
  • react-query (with graphql-request@5.0.0)
  • swr (with graphql-request@5.0.0)
  • @urql/exchange-graphcache (since 3.1.11)
• Svelte
  • @urql/svelte (since 1.1.3)
• Vue
  • @vue/apollo-composable (since 4.0.0-alpha.13)
  • villus (since 1.0.0-beta.8)
  • @urql/vue (since 1.11.0)
• Others
  • graphql-js (since 15.2.0)
  • graphql-request (since 5.0.0)

You will find demos and code examples for each of them in the examples/front-end/ folder of the codegen repository.

You will also find a complete guide for React and Vue in codegen documentation.

We aim for GraphQL Code Generator 3.0’s client preset to become the official way to generate GraphQL Types for front-end use cases, replacing all existing hook and SDK-based plugins.

For this reason, we encourage you to already give a try at the codegen v3 client preset (@graphql-codegen/client-presec) and provide feedback on this issue.

The v3 stable release will be shipped once sufficient feedback is posted.

Finally, while the GraphQL Code Generator 3.0 milestone aims to provide a unified front-end experience through the preset: client, the 3.x versions aim to fully rewrite the core packages of codegen.

Some core parts of codegen are more than 6 years old and need to be rewritten (optimized, simplified, and more).

We plan to incorporate the pending issues related to the core packages in this gradual 3.x milestones.

Introduction of the “community plugins”

Historically, all plugins were pushed to the https://github.com/dotansimha/graphql-code-generator repository, making it hard for us to review all contributions in a reasonable timeframe and to enforce consistency across all the options introduced in the different packages.

We believe that the best way to keep codegen extensible and improve the contribution experience at scale is to introduce the concept of community plugins.

A community plugin offers a feature-set that diverges from the preset: client or a plugin created by the community.

Soon, all the existing plugins part of the list below and all the future plugins created by the community will live in their dedicated repository:

• @graphql-codegen/typescript-react-apollo
• @graphql-codegen/typescript-graphql-request
• @graphql-codegen/typescript-apollo-angular
• @graphql-codegen/typescript-apollo-client-helpers
• @graphql-codegen/typescript-react-query
• @graphql-codegen/typescript-urql
• @graphql-codegen/named-operations-object
• @graphql-codegen/urql-introspection
• @graphql-codegen/flow-resolvers
• @graphql-codegen/typescript-vue-apollo
• @graphql-codegen/typescript-rtk-query
• @graphql-codegen/flow-operations
• @graphql-codegen/typescript-msw
• @graphql-codegen/typescript-mongodb
• @graphql-codegen/typescript-type-graphql
• @graphql-codegen/jsdoc
• @graphql-codegen/typescript-vue-urql
• @graphql-codegen/kotlin
• @graphql-codegen/typescript-vue-apollo-smart-ops
• @graphql-codegen/java
• @graphql-codegen/c-sharp-operations
• @graphql-codegen/hasura-allow-list
• @graphql-codegen/typescript-stencil-apollo
• @graphql-codegen/relay-operation-optimizer
• @graphql-codegen/typescript-oclif
• @graphql-codegen/java-resolvers
• @graphql-codegen/java-apollo-android

All the above plugins will be eligible for repository ownership transfer based on relevant past contributions.

Of course, such a change will come with help from our side:

• We will create a new “Create a plugin” guide that will provide complete information and guidelines (ex: publishing, codegen APIs, adding your plugin to the codegen hub)
• Since each community plugin will live in its own repository, we will provide a proper Github repository template with building and publishing CI tools configured.

What about server-side plugins?

The 3.x milestones include some work on server-side plugins such as typescript-resolvers (ex: improving Federation support).

---

Milestones

Below are the details of the aforementioned plans for the 3.0 and 3.x milestones.

3.0

• client preset
  • Integrate with most of the GraphQL clients
    • graphql-request https://github.com/prisma-labs/graphql-request/pull/350/files
    • React Query (works with graphql-request)
    • SWR (works with graphql-request)
  • Fix pending issues on gql-tag-operation-preset
    • gql-tag-operations-preset babelPlugin doesn't work with vite #8206
  • canary release: GraphQL Code Generator v3: RFC umbrella PR #8248
    • TypeScript config support
    • documents preset preconfiguration
    • opinionated plugins configuration
    • deprecate gql-tag-operations-preset in favor of the client-preset
  • examples: How to use codegen in front-end applications, code examples using preset: front-end #8184
  • Update documentation for front-end/GraphQL clients parts
  • Update graphql-request docs on their repo
    • chore(docs): update documentation on GraphQL Code Generator integration jasonkuhrt/graphql-request#392
    • Update Apollo Client docs
      • doc(static-typing): rewrite with GraphQL Code Generator setup apollographql/apollo-client#10173
    • Update URQL docs
      • doc: add section for TypeScript types generation with GraphQL Code Generator urql-graphql/urql#2729
    • Update SWR GraphQL documentation with a link to codegen doc
      • doc(data-fetching): add mention of GraphQL Code Generator for end-to-end type safety vercel/swr-site#359
  • official release 🚢

4.x

• Drop Node.js 14 support. Require Node.js 16
• Create a TypedDocumentNode string alternative (TypedString) that does not require GraphQL AST on the Client (should be easily configurable within the preset)
• Support @defer and @stream in operations plugin #7885

5.x

preset: client improvements

• Only generate actually used types
• Support operation minification/compilation? (aka embed/re-invent relay-compiler) https://relay-compiler-repl.netlify.app/
  • Support (parameterized) Fragment Arguments? Parameterized fragments graphql/graphql-spec#204
• “Client Controlled Nullability” support
  → feat: override operation field types via directives #8071
• https://tortilla-hq.slack.com/archives/CCVDM3NCD/p1659508122835199
• Refactor preset: client to not use the old plugins (get rid of actual core packages)
• better TypeScript/VSCode integration
  • Potential solution: gql-tag-operations-preset and vscode typescript #8345 (comment)
• create a Github template repository
• new documentation for creating a plugin
  • + updated contributing guidelines
• move all community plugins to a dedicated repository
  • move the related issues + communicate about new contribution guidelines
  • Reach out to potential people who want to support
• https://github.com/dotansimha/graphql-code-generator/issues/8061
• Add support for AWS AppSync client
• Update apollo-angular docs
  • → not enough time
• Better support for graphql-scalars #8413

Future of codegen CLI

• Better TypeScript config support
  • get typed options (config) → WIP 🚧
• Remove usage of DetailedError which is not well-handled by listr #8200
• Allow generating outputs even if there are no documents (so you can still generate the gql function for getting started)
• Better configuration
• Performance
  • Smarter watch #5642
  • Incremental builds (Incremental rebuilds #6142)
• Remove graphql dependency
• Better monorepo support?
  • multi-project, etc.
  • shareable configs? → (one codegen file versus many)
• Improve TypeScript support in libraries that already support TypedDocumentNode (variables should be required if there are required variables in the operation declaration and optional if there are none)
  • URQL
  • Apollo Client

Back-end code generation issues

We will go over the following typescript-resolvers and graphql-modules pending plugins issues:

• [TypeScript Resolvers] feat: Generate Interface types without field resolvers #2194
• Federation Resolvers: Pick<ParentType, 'fieldName'> is incorrect for mapped parent types. #3207
• [typescript-resolvers] Enums ValueMaps don't get generated anymore #3619
• [typescript-resolvers] avoid input optional as typescript-operations #3815
• enumPrefix not working properly with typescript-resolvers #3873
• Resolve input types with preResolveTypes same as selection sets #3958
• [typescript-resolver] interface resolver should could use type mappers  #4121
• When federation is enabled for a type, its resolvers have a wrong ParentType #4722
• Multiple @key directives not supported when type is extended #4739
• Avoid optionals on fields influences variables #4788
• https://github.com/dotansimha/graphql-code-generator/issues/4901
• [typescript-resolvers] Allow passing parent types to Resolvers #5517
• Error "Cannot find name 'User'" in typescript-resolvers output #5841
• FieldWrapper not applied to fields in union resolver type #5776
• Possibility of passing an expression for the mappers config #5594
• Federation with custom mappers #5646
• Mapped types are dropped when combined with unions at non-trivial depth. #5998
• [typescript-resolvers] Missings args types in QueryResolvers #5968
• Types for input objects should not have a prototype #5964
• [typescript-resolvers] Map custom context type on a type-level #6483
• Subscription resolver args are of type any #6482
• TypeScript Resolvers: Easier way to get possible resolve types for interfaces #6443
• TypeScript Resolvers plugin doesn't allow null to be returned from a promise #6173
• [typescript-resolvers] Resolvers' default result type should allow async and resolvable object values #7358
• Allow typescript-resolvers plugin to export resolver function alias type #7373
• Directive resolver input arguments type ignores enumPrefix = false #7560
• [experimental-graphql-modules] no config in generation for enums #5242
• Support for Args and related module types in GraphQL Module Resolvers #5139
• graphql-modules-preset doesn't obey enumsAsTypes and doesn't generate per-module Resolvers types for enum internal values #6023
• Watch generates different files from no watch (graphql-modules) #6851
• Watch generates different files from no watch (graphql-modules) #6851
• graphql-modules-preset is not adding interface and union resolvers to Module.Resolver #7123
• graphql-modules-preset is not adding interface and union resolvers to Module.Resolver #7123
• [graphql-modules-preset] Import declarations in a namespace cannot reference a module #7671