UserType.js

var UserType = new GraphQLObjectType({
    name: 'User',
    description: 'A venerable Chorus user',
    isTypeOf: (obj, info) => obj instanceof db.User,
    interfaces: [nodeDefinitions.nodeInterface],
    fields: () => ({
        id: globalIdField('User'),
        username: {
            type: GraphQLString,
            description: 'A username.',
            resolve: user => user.get('username')
        },        
        viewerIsFollowing: {
            type: GraphQLBoolean,
            description: 'Whether you are following this user',
            resolve: async (user, args, { user: viewer }) => {
                const isFollowing = await viewer.isFollowing(user);
                return isFollowing ? true : false;
            }
        }       
        email: {
            type: GraphQLString,
            description: 'An email address on the World Wide Web.',
            resolve: user => user.get('email')
        }
    })
});