ObjectType extends does not work

[zuijiaoluo]

Describe the bug
I wanted to do a simple paging query, but found that ObjectType extends was not possible and the following error occurred, which would not have occurred without inheritance

To Reproduce
type.ts

@ObjectType()
export class PageInfo {
  @Field({ nullable: true })
  startCursor?: string;

  @Field({ nullable: true })
  endCursor?: string;

  @Field({ nullable: false })
  hasPreviousPage: boolean;

  @Field({ nullable: false })
  hasNextPage: boolean;

  @Field({ nullable: false })
  totalCount: number;
}

@ObjectType()
export class Connection {
  @Field({ nullable: true })
  pageInfo: PageInfo;
}
@ObjectType()
export class TextConnection extends Connection {
  @Field({ nullable: true })
  name: string;
}

resolver.ts

@Query(returns => TextConnection, { nullable: true })
  async Test() {
    return {
      pageInfo: {
        startCursor: 'string',
        endCursor: 'string',
        hasPreviousPage: true,
        hasNextPage: true,
        totalCount: 0,
      },
      name: "ok"
    };
  }

Expected behavior
just back true result

Logs

Enviorment (please complete the following information):

• OS: mac
• Node 8.9.1
• Package version ^0.15.0
• TypeScript version 3.1.6

Additional context
Add any other context about the problem here.

[MichalLytek]

Looks like a duplicate of #160 😕

[zuijiaoluo]

What can I do? I want to help solve this problem.

[MichalLytek]

You have to wait 😞 #160 will be fixed by #183

[zuijiaoluo]

Thank you. I'll wait for the new version, but I don't know how long it will take. Is there a temporary solution?

[MichalLytek]

Yes, you just need to return an instance of the class.
You can use a custom helper to be able to use plain objects - see #73 (comment)