From my medium post on Keycloak auth in GraphQL

keycloak-connect-graphql-middlewares-example.js

const { auth, hasRole } = require('keycloak-connect-graphql')

const resolvers = {
  Article: {
    analytics: hasRole('editor')(articleAnalyticsResolver)
  },
  Query: {
    listArticles: auth(listArticlesResolver)
  },
  mutation: {
    publishArticle: hasRole('editor')(publishArticleResolver)
  }
}