resolveType on unions and itnerface from type-graphql ignored when using code first approach

Describe the bug When I try defining a resolveType function on createUnionType, it compiles succesfully but I’m getting this warning:

Type "MyUnionType" is missing a "__resolveType" resolver. Pass false into "resolverValidationOptions.requireResolversForResolveType" to disable this warning.

The type then really isn’t working and complains with this:

Abstract type MyUnionType must resolve to an Object type at runtime for field UserType.myUnion (...)

To Reproduce

export const MyUnionType = createUnionType({
  name: 'MyUnionType',
  types: [PersonType, PlaceType],
  resolveType: value => {
    if (value instanceof PersonEntity) {
      return PersonType;
    }
    if (value instanceof PlaceEntity) {
      return PlaceType;
    }
    return undefined;
  },
});

(I didn’t test if the resolveType method itself works properly, but that’s unrelated to this issue as it’s obviously ignored - definitely doesn’t get called).

Expected behavior This should work and resolve into the proper type at runtime.

Enviorment

• OS: MacOS
• Node 12.1.0
• Package version 0.17.3
• TypeScript version 3.4.2
• @nestjs/graphql version 6.0.5

[kamilmysliwiec]

It should be fixed in the @next version ($ npm i @nestjs/graphql@next). You will also have to update @nestjs/core to 6.2.0 ($ npm i @nestjs/core@6.2.0)

[kamilmysliwiec]

Published as 6.2.0 ($ npm i @nestjs/graphql@latest). You will also have to update @nestjs/core to 6.2.0 ($ npm i @nestjs/core@latest)