nexus

Nexus

Declarative, code-first and strongly typed GraphQL schema construction for TypeScript & JavaScript

GraphQL Nexus can be used independently from Prisma. To learn how it can best be combined with Prisma, check out the nexus-prisma plugin.

Overview

• Code-first: Programmatically define your GraphQL types in JavaScript/TypeScript
• Compatible with the GraphQL ecosystem: Nexus is based on graphql-js
• Type-safe: Nexus enables auto-completion and error checks in your IDE (even for JS)
• Generates SDL & TS definitions: SDL schema and typings are updated as you code

Examples

"Hello World" GraphQL server with graphql-yoga

import { queryType, stringArg, makeSchema } from "nexus";
import { GraphQLServer } from "graphql-yoga";

const Query = queryType({
  definition(t) {
    t.string("hello", {
      args: { name: stringArg({ nullable: true }) },
      resolve: (parent, { name }) => `Hello ${name || "World"}!`,
    });
  },
});

const schema = makeSchema({
  types: [Query],
  outputs: {
    schema: __dirname + "/generated/schema.graphql",
    typegen: __dirname + "/generated/typings.ts",
  },
});

const server = new GraphQLServer({
  schema,
});

server.start(() => `Server is running on http://localhost:4000`);

All examples of GraphQL Nexus can be found in the /examples directory:

• githunt-api
• ts-ast-reader
• apollo-fullstack
• star-wars
• kitchen-sink

If you're interested in examples using the nexus-prisma plugin, check out the official prisma-examples repo:

• GraphQL blogging app
• GraphQL blogging app with authentication & authorization
• GraphQL CRUD example

Features

• Expressive, declarative API for building schemas
• No need to re-declare interface fields per-object
• Optionally possible to reference types by name (with autocomplete) rather than needing to import every single piece of the schema
• Assumes non-null by default, but makes this configurable on per-schema/per-type basis
• Interoperable with vanilla graphql-js types, and it's just a GraphQLSchema so it fits in just fine with existing community solutions of apollo-server, graphql-middleware, etc.
• Inline function resolvers for when you need to do simple field aliasing
• Auto-generated graphql SDL schema, great for when seeing how any code changes affected the schema
• Lots of good examples to get you started and thorough API documentation
• Full type-safety for free
• Internal structure allows library authors to build more advanced abstractions
• Independent from Prisma, but integrates nicely using the nexus-prisma plugin
• Allows code re-use by creating higher level "functions" which wrap common fields

Documentation

You can find the docs for GraphQL Nexus here.

Install

GraphQL Nexus can be installed via the nexus package. It also requires graphql as a peer dependency:

npm install --save nexus graphql

or

yarn add nexus graphql

Migrate from SDL

If you've been following an SDL-first approach to build your GraphQL server and want to see what your code looks like when written with GraphQL Nexus, you can use the SDL converter:

---

License (MIT)

(c) 2018-2019 Tim Griesser

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Changelog

0.12.0-rc

• feat(deps): Bumps the default minimum version of graphql-js to 14.5.0

  Nexus uses the new extensions property on types to store metadata provided to Nexus types, in order to make them usable by plugins.

• feat: Adds "Plugins" API, see the docs for more info on what all these can help accomplish

• feat(plugin): Add nullabilityGuardPlugin. See the docs for more info

• feat(plugin): Add fieldAuthorizePlugin. See the docs for more info

  This is the same behavior as before, but implemented more flexibly as a plugin. This will be automatically added if no plugins are specified, otherwise it will need to be imported & added to makeSchema.

• feat(schema): Adds shouldExitAfterGenerateArtifacts option to makeSchema

  The shouldExitAfterGenerateArtifacts makes it possible to exit after the types are generated, useful if you do not check a schema artifact into source control, but wish to generate before the code runs.

• refactor: Removes nexusWrappedType

  This was an internal implementation detail which should not affect end users

• refactor: Removes t.modifyType API

  This may not have ever worked, it was only intended to modify fields on an objectType which were originally implemented by an interface. Please open an issue if this is a breaking change for you, so we can understand the use-case and design a better API.

• test: Improved code coverage, adds base threshold to new PRs