import { GraphQLUnionType } from "https://dotland.deno.dev/x/graphql_deno@v15.0.0/mod.ts";
Returns
GraphQLUnionTypeConfig<any, any> & { types: Array<GraphQLObjectType>; extensions: Maybe<Readonly<Record<string, any>>>; extensionASTNodes: ReadonlyArray<UnionTypeExtensionNode>; }