How to migrate from SDL-first GraphQL to Nexus?

Use the SDL converter tool mentioned in the docs to translate .graphql files into Nexus code, but expect to manually refactor for optimal type safety and to leverage Nexus's declarative API effectively. The process involves rewriting schema logic and adapting to code-first patterns.

Nexus vs Apollo Server for building schemas?

Nexus focuses on code-first, type-safe schema construction with automatic type inference, while Apollo Server is a full GraphQL server that can use various schema approaches. Nexus is better for TypeScript teams wanting compile-time safety, whereas Apollo Server offers more integrated tooling out of the box.

How to add custom middleware or plugins in Nexus?

Leverage the plugin system by creating or using existing plugins; for middleware, integrate with tools like GraphQL Middleware since Nexus generates standard GraphQLSchema objects. However, native plugin development requires understanding Nexus's internal APIs and might involve extra configuration.

Does Nexus work with JavaScript without TypeScript?

Yes, Nexus supports JavaScript, but you'll miss out on the automatic type inference and compile-time safety that are core selling points. It's interoperable with vanilla graphql-js, but the experience is less robust compared to TypeScript usage.

How to handle errors in Nexus GraphQL resolvers?

Use standard GraphQL error handling within inline resolvers or leverage plugins for centralized error management. Since Nexus doesn't enforce a specific error strategy, you may need to implement custom logic or rely on community plugins for advanced features.

What's the performance impact of Nexus plugins?

Plugins add minimal runtime overhead as they integrate at schema construction, but complex plugins or many of them can slow down build times due to type generation and additional processing. Runtime performance is generally comparable to plain graphql-js.

Open-Awesome

graphql-nexus

MITTypeScriptv1.3.0

A declarative, code-first GraphQL schema builder for TypeScript/JavaScript that provides full type safety.

Visit Website GitHub

3.4k stars272 forks0 contributors

What is graphql-nexus?

Nexus is a GraphQL schema construction library that uses a code-first, declarative approach to build type-safe GraphQL APIs. It allows developers to define their GraphQL schema entirely in TypeScript or JavaScript, providing automatic type inference and eliminating the need for manual type definitions or SDL files.

Target Audience

TypeScript and JavaScript developers building GraphQL servers who want a type-safe, maintainable schema definition workflow, especially those transitioning from SDL-first approaches.

Value Proposition

Developers choose Nexus for its seamless type safety, expressive API, and interoperability with existing GraphQL ecosystems, reducing boilerplate and catching errors at compile time rather than runtime.

Overview

Code-First, Type-Safe, GraphQL Schema Construction

Use Cases

Best For

Building type-safe GraphQL APIs with TypeScript
Migrating from SDL-first to code-first GraphQL development
Creating maintainable GraphQL schemas with reusable components
Integrating GraphQL with existing Node.js backends
Developing GraphQL servers with automatic SDL generation
Extending GraphQL functionality through a plugin system

Not Ideal For

Projects deeply entrenched in SDL-first workflows with extensive .graphql files who prioritize schema definition via GraphQL SDL over code.
Teams needing ultra-lightweight GraphQL setups for rapid prototyping where the overhead of type safety and code-first abstraction isn't justified.
Environments using backend languages other than TypeScript/JavaScript, as Nexus is confined to Node.js ecosystems.

Pros & Cons

Pros

Strong Type Safety

Automatically infers TypeScript types for GraphQL resolvers, arguments, and return values, catching errors at compile time rather than runtime, as highlighted in the features for reducing bugs.

Declarative API

Offers an expressive, chainable API that feels natural in TypeScript/JavaScript, making schema construction intuitive and reducing boilerplate, as emphasized in the declarative approach.

Plugin Extensibility

Includes a powerful plugin system for adding custom behaviors and integrations, allowing flexibility beyond core features, mentioned in the plugin architecture.

DRY Schema Design

Enables reuse and composition of types with higher-level abstractions, keeping schemas maintainable and reducing duplication, as noted in the DRY schema design feature.

Cons

Setup Overhead

Requires configuring outputs for auto-generated SDL and typegen files, adding initial setup steps that can be complex compared to simpler, out-of-the-box GraphQL solutions.

TypeScript Dependency

Optimal benefits are tied to TypeScript; while it works with JavaScript, pure JS users miss out on full type safety, limiting its appeal in non-TypeScript projects.

Migration Complexity

For teams migrating from SDL-first, there's a significant learning curve and code rewrite involved, as admitted in the migration tool mention, which can slow adoption.

Frequently Asked Questions

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