How to use @comunica/mediator-combine-union - 3 common examples

'dbpprop': 'http://dbpedia.org/property/',
    'schema': 'http://schema.org/',
    'skos': 'http://www.w3.org/2008/05/skos#'
  },
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-parsers.json#mySparqlParser',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_sparql_parse_Bus_SparqlParse
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_graphql_parsers_json_myGraphqlParser = new (require('@comunica/actor-sparql-parse-graphql').ActorSparqlParseGraphql)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/graphql-parsers.json#myGraphqlParser',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_sparql_parse_Bus_SparqlParse
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_init_json_mediatorSparqlSerialize = new (require('@comunica/mediator-race').MediatorRace)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-init.json#mediatorSparqlSerialize',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_sparql_serialize_Bus_SparqlSerialize
});
const __b0bnode258 = new (require('@comunica/mediator-combine-union').MediatorCombineUnion)({
  'field': 'mediaTypes',
  'name': '_:b0bnode258',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_sparql_serialize_Bus_SparqlSerialize
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_serializers_json_myJsonSparqlSerializer = new (require('@comunica/actor-sparql-serialize-json').ActorSparqlSerializeJson)({
  'mediaTypes': {
    'application/json': '1.0'
  },
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-serializers.json#myJsonSparqlSerializer',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_sparql_serialize_Bus_SparqlSerialize
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_serializers_json_mySimpleSparqlSerializer = new (require('@comunica/actor-sparql-serialize-simple').ActorSparqlSerializeSimple)({
  'mediaTypes': {
    'simple': '1.0'
  },
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-serializers.json#mySimpleSparqlSerializer',

'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/http.json#mediatorHttp',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_http_Bus_Http
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_join_json_myRdfJoinActor = new (require('@comunica/actor-rdf-join-nestedloop').ActorRdfJoinNestedLoop)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/join.json#myRdfJoinActor',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_join_Bus_RdfJoin
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_queryoperators_json_mediatorRdfJoin = new (require('@comunica/mediator-race').MediatorRace)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-queryoperators.json#mediatorRdfJoin',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_join_Bus_RdfJoin
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql_file__1_0_0_config_sets_rdf_dereference_json_mediatorRdfParse = new (require('@comunica/mediator-race').MediatorRace)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql-file/^1.0.0/config/sets/rdf-dereference.json#mediatorRdfParse',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_parse_Bus_RdfParse
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql_file__1_0_0_config_sets_rdf_dereference_json_mediatorRdfParseMediatypes = new (require('@comunica/mediator-combine-union').MediatorCombineUnion)({
  'field': 'mediaTypes',
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql-file/^1.0.0/config/sets/rdf-dereference.json#mediatorRdfParseMediatypes',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_parse_Bus_RdfParse
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql_file__1_0_0_config_sets_rdf_dereference_json_mediatorRdfParseHandle = new (require('@comunica/mediator-race').MediatorRace)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql-file/^1.0.0/config/sets/rdf-dereference.json#mediatorRdfParseHandle',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_parse_Bus_RdfParse
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_rdf_parsers_json_myRdfParserN3 = new (require('@comunica/actor-rdf-parse-n3').ActorRdfParseN3)({
  'mediaTypes': {
    'application/trig': '1.0',
    'application/n-quads': '0.7',
    'text/turtle': '0.6',
    'application/n-triples': '0.3',
    'text/n3': '0.1'
  },

'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_serialize_Bus_RdfSerialize
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_rdf_serializers_json_myRdfSerializeJsonLd = new (require('@comunica/actor-rdf-serialize-jsonld').ActorRdfSerializeJsonLd)({
  'jsonStringifyIndentSpaces': 2,
  'mediaTypes': {
    'application/ld+json': '1.0'
  },
  'priorityScale': '9.0E-1',
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/rdf-serializers.json#myRdfSerializeJsonLd',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_serialize_Bus_RdfSerialize
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_serializers_json_mediatorRdfSerialize = new (require('@comunica/mediator-race').MediatorRace)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-serializers.json#mediatorRdfSerialize',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_serialize_Bus_RdfSerialize
});
const __b0bnode262 = new (require('@comunica/mediator-combine-union').MediatorCombineUnion)({
  'field': 'mediaTypes',
  'name': '_:b0bnode262',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_serialize_Bus_RdfSerialize
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_context_preprocess_rdf_source_identifiers_json_mediatorRdfSourceIdentifier = new (require('@comunica/mediator-number').MediatorNumber)({
  'field': 'priority',
  'type': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/mediator-number/Mediator/Number/type/TypeMax',
  'ignoreErrors': true,
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/context-preprocess-rdf-source-identifiers.json#mediatorRdfSourceIdentifier',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_rdf_source_identifier_Bus_RdfSourceIdentifier
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_init_json_mediatorContextPreprocess = new (require('@comunica/mediator-combine-pipeline').MediatorCombinePipeline)({
  'name': 'https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-init-sparql/^1.0.0/config/sets/sparql-init.json#mediatorContextPreprocess',
  'bus': https___linkedsoftwaredependencies_org_bundles_npm__comunica_bus_context_preprocess_Bus_ContextPreprocess
});
const https___linkedsoftwaredependencies_org_bundles_npm__comunica_actor_init_sparql__1_0_0_config_sets_sparql_queryoperators_json_mediatorResolveQuadPattern = new (require('@comunica/mediator-race').MediatorRace)({