Multiple schema typing issue

See: https://github.com/prisma-labs/nexus/issues/269

Also happens in this project. `NexusGraphQLModules/src/modules/messages/query.type.ts` has type errors in line 9 and 16.

The error:
`Type 'string[]' is not assignable to type '"Query" | "Chat" | "Mutation" | "Boolean" | "Float" | "ID" | "Int" | "String" | NexusObjectTypeDef | NexusInterfaceTypeDef | NexusUnionTypeDef | NexusEnumTypeDef<...> | NexusScalarTypeDef<...> | NexusWrappedType<...>'.
Type 'string[]' is not assignable to type '"String"'.`

Start by opening NexusGraphQLModules/src/modules/messages/query.type.ts and inspecting the reported type errors on lines 9 and 16. Compare the behavior with the linked Nexus issue and reproduce the TypeScript errors; done means those errors no longer occur in this project.

Written by the indexing model from the issue text.