How to use the graphql.GraphQLUnionType function in graphql

description:
				'May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.',
		},
		// valueSetReference: http://hl7.org/fhir/ValueSet/participant-role
		role: {
			type: new GraphQLList(require('./codeableconcept.schema.js')),
			description:
				'The role this team member is taking within this episode of care.',
		},
		period: {
			type: require('./period.schema.js'),
			description:
				'The period of time this practitioner is performing some role within the episode of care.',
		},
		member: {
			type: new GraphQLUnionType({
				name: 'EpisodeOfCarecareTeammember_member_Union',
				description: 'The practitioner (or Organization) within the team.',
				types: () => [
					require('./practitioner.schema.js'),
					require('./organization.schema.js'),
				],
				resolveType(data) {
					if (data && data.resourceType === 'Practitioner') {
						return require('./practitioner.schema.js');
					}
					if (data && data.resourceType === 'Organization') {
						return require('./organization.schema.js');
					}
				},
			}),
			description: 'The practitioner (or Organization) within the team.',

type: new GraphQLNonNull(
				new GraphQLUnionType({
					name: 'ImagingStudypatient_patient_Union',
					description: 'The patient imaged in the study.',
					types: () => [require('./patient.schema.js')],
					resolveType(data) {
						if (data && data.resourceType === 'Patient') {
							return require('./patient.schema.js');
						}
					},
				}),
			),
			description: 'The patient imaged in the study.',
		},
		context: {
			type: new GraphQLUnionType({
				name: 'ImagingStudycontext_context_Union',
				description:
					'The encounter or episode at which the request is initiated.',
				types: () => [
					require('./encounter.schema.js'),
					require('./episodeofcare.schema.js'),
				],
				resolveType(data) {
					if (data && data.resourceType === 'Encounter') {
						return require('./encounter.schema.js');
					}
					if (data && data.resourceType === 'EpisodeOfCare') {
						return require('./episodeofcare.schema.js');
					}
				},
			}),

if (data && data.resourceType === 'Group') {
						return require('./group.schema.js');
					}
					if (data && data.resourceType === 'Device') {
						return require('./device.schema.js');
					}
					if (data && data.resourceType === 'Location') {
						return require('./location.schema.js');
					}
				},
			}),
			description:
				'The subject of the report. Usually, but not always, this is a patient. However diagnostic services also perform analyses on specimens collected from a variety of other sources.',
		},
		context: {
			type: new GraphQLUnionType({
				name: 'DiagnosticReportcontext_context_Union',
				description:
					'The healthcare event  (e.g. a patient and healthcare provider interaction) which this DiagnosticReport per is about.',
				types: () => [
					require('./encounter.schema.js'),
					require('./episodeofcare.schema.js'),
				],
				resolveType(data) {
					if (data && data.resourceType === 'Encounter') {
						return require('./encounter.schema.js');
					}
					if (data && data.resourceType === 'EpisodeOfCare') {
						return require('./episodeofcare.schema.js');
					}
				},
			}),

name: 'Communicationtopic_topic_Union',
					description:
						'The resources which were responsible for or related to producing this communication.',
					types: () => [require('./resource.schema.js')],
					resolveType(data) {
						if (data && data.resourceType === 'Resource') {
							return require('./resource.schema.js');
						}
					},
				}),
			),
			description:
				'The resources which were responsible for or related to producing this communication.',
		},
		context: {
			type: new GraphQLUnionType({
				name: 'Communicationcontext_context_Union',
				description: 'The encounter within which the communication was sent.',
				types: () => [
					require('./encounter.schema.js'),
					require('./episodeofcare.schema.js'),
				],
				resolveType(data) {
					if (data && data.resourceType === 'Encounter') {
						return require('./encounter.schema.js');
					}
					if (data && data.resourceType === 'EpisodeOfCare') {
						return require('./episodeofcare.schema.js');
					}
				},
			}),
			description: 'The encounter within which the communication was sent.',

(0, _traverse2.default)(rootSchema).forEach(function parseUnion(schema, context) {
		var isUnion = schema && (0, _lodash.isArray)(schema.anyOf);
		var isCached = schema && schema.$$type;
		if (isUnion && !isCached) {
			var schemaId = Symbol(TYPE_SCHEMA_SYMBOL_LABEL);
			schema.$$type = schemaId;
			typesCache[schemaId] = new _graphql.GraphQLUnionType({
				name: extractTypeName(context),
				types: function types() {
					return schema.anyOf.map(function (subSchema) {
						return typesCache[subSchema.$$type];
					});
				},
				resolveType: function resolveType(value) {
					if (value[discriminatorFieldName]) {
						return value[discriminatorFieldName];
					}
				}
			});
		}
	});
};

if (data && data.resourceType === 'Patient') {
						return require('./patient.schema.js');
					}
					if (data && data.resourceType === 'Practitioner') {
						return require('./practitioner.schema.js');
					}
					if (data && data.resourceType === 'RelatedPerson') {
						return require('./relatedperson.schema.js');
					}
				},
			}),
			description: 'Who reported the device was being used by the patient.',
		},
		device: {
			type: new GraphQLNonNull(
				new GraphQLUnionType({
					name: 'DeviceUseStatementdevice_device_Union',
					description: 'The details of the device used.',
					types: () => [require('./device.schema.js')],
					resolveType(data) {
						if (data && data.resourceType === 'Device') {
							return require('./device.schema.js');
						}
					},
				}),
			),
			description: 'The details of the device used.',
		},
		indication: {
			type: new GraphQLList(require('./codeableconcept.schema.js')),
			description: 'Reason or justification for the use of the device.',
		},

description:
				'unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.',
		},
		extension: {
			type: new GraphQLList(require('./extension.schema.js')),
			description:
				'May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.',
		},
		modifierExtension: {
			type: new GraphQLList(require('./extension.schema.js')),
			description:
				'May be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.',
		},
		agent: {
			type: new GraphQLNonNull(
				new GraphQLUnionType({
					name: 'SupplyRequestrequesteragent_agent_Union',
					description:
						'The device, practitioner, etc. who initiated the request.',
					types: () => [
						require('./practitioner.schema.js'),
						require('./organization.schema.js'),
						require('./patient.schema.js'),
						require('./relatedperson.schema.js'),
						require('./device.schema.js'),
					],
					resolveType(data) {
						if (data && data.resourceType === 'Practitioner') {
							return require('./practitioner.schema.js');
						}
						if (data && data.resourceType === 'Organization') {
							return require('./organization.schema.js');

import { ShowType } from "schema/v2/show"
import { ArticleType } from "schema/v2/article"
import { GraphQLUnionType } from "graphql"

export const ArtworkHighlightType = new GraphQLUnionType({
  name: "ArtworkHighlight",
  types: [ShowType, ArticleType],
  resolveType(value, _context, _info) {
    switch (value.highlight_type) {
      case "Show":
        return ShowType
      case "Sale":
      case "Article":
        return ArticleType
      default:
        throw new Error(`Unknown highlight type: ${value.highlight_type}`)
    }
  },
})

type: new GraphQLList(userType),
      resolve(obj, args) {
        return paginate(
          args.offset,
          args.limit,
          obj.memberIds
            .map((id: number) => users.find(u => u.id === id))
            .filter(Boolean)
        );
      }
    }
  }),
  interfaces: [nodeInterface]
});

export let assigneeUnionType = new GraphQLUnionType({
  name: "AssigneeType",
  types: [userType, workingGroupType],
  resolveType(value) {
    if (value.type === "User") {
      return userType;
    } else if (value.type === "WorkingGroup") {
      return workingGroupType;
    }
  }
});

export let siteStatisticsType: GraphQLObjectType = new GraphQLObjectType({
  name: "SiteStatistics",
  fields: () => ({
    id: globalIdField(),
    weeklySales: { type: new GraphQLNonNull(GraphQLFloat) },

modifierExtension: {
			type: new GraphQLList(require('./extension.schema.js')),
			description:
				'May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.',
		},
		_started: {
			type: require('./element.schema.js'),
			description: 'Date and Time the study started.',
		},
		started: {
			type: DateTimeScalar,
			description: 'Date and Time the study started.',
		},
		patient: {
			type: new GraphQLNonNull(
				new GraphQLUnionType({
					name: 'ImagingStudypatient_patient_Union',
					description: 'The patient imaged in the study.',
					types: () => [require('./patient.schema.js')],
					resolveType(data) {
						if (data && data.resourceType === 'Patient') {
							return require('./patient.schema.js');
						}
					},
				}),
			),
			description: 'The patient imaged in the study.',
		},
		_uid: {
			type: require('./element.schema.js'),
			description: 'Formal identifier for the study.',
		},