Installation
npm install graphql graphql-compose --save
yarn add graphql graphql-compose
Module graphql is declared in peerDependencies, so it should be installed explicitly in your project. This helps to solve a common problem when some of your other dependencies (like Relay, GraphiQL, graphql-compose) can leave your node_modules directory with duplicate installs of GraphQL.js. In such case graphql-js may throw errors stating that some classes are not instances of duplicate module.
Also you may need to install some graphql-compose plugins. Each plugin has own Install section with instructions.