schema.js

import { GraphQLNonNull } from "graphql"
import { GraphQLString } from "graphql"
import { createGQLType } from "../../lib/schema-utils"

export const NodeMeta = createGQLType({
  name: "NodeMeta",
  fields: {
    key: {
      type: new GraphQLNonNull(GraphQLString),
      description:
        "A unique key that can identify this node e.g. cohort:1, user:2, etc."
    },

    // these fields mirror open graph meta tags: https://ogp.me/
    title: {
      type: new GraphQLNonNull(GraphQLString),
      description:
        "The title of your node as it should appear within the graph,"
    },
    image: {
      type: GraphQLString,
      description:
        "An image URL which should represent your node within the graph."
    },
    type: {
      type: new GraphQLNonNull(GraphQLString),
      description: "The type of the node (user, course, cohort, etc.)"
    },
    url: {
      type: GraphQLString,
      description: "The canonical URL of your node in the graph"
    },
    description: {
      type: GraphQLString,
      description: "A one to two sentence description of your node."
    },

    // these fields are specific to our implementation

    subtitle: {
      type: GraphQLString,
      description: "The subtitle of this node"
    },
    icon: {
      type: GraphQLString,
      description: "The icon of this node"
    },
    background_image: {
      type: GraphQLString,
      description: "The image of this node"
    },
    avatar: {
      type: GraphQLString,
      description: "The avatar of this node"
    }
  }
})