Extending using PartialType, OmitType… doesn't copy properties decorators

[mlbonniec]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current behavior

Hi, I've noticed that when extending a class (Child) from another (Parent), using PartialType (for example, but this is the same with the other wrappers) doesn't add the Parent properties decorators to the Child.

How did I notice this ? I've some swagger @ApiProperty() decorators in my CreateDto, and when extending the UpdateDto extends PartialType(CreateDto) {}, the UpdateDto doesn't have any properties in the Swagger.``

However, removing the PartialType wrapper "fix" the issue.

Reproduction

https://stackblitz.com/edit/nestjs-issue-minimum-repro-starter-2zmyjl

Expected behavior

All the Parent properties decorators should be copied to the Child.

Package version

2.0.2

Node.js version

18.16.1

In which operating systems have you tested?

• [X] macOS
• [ ] Windows
• [ ] Linux

Other

No response

[micalevisk]

Please provide a minimum reproduction repository. You can start from this minimal project.

why reproductions are required

[mlbonniec]

@micalevisk I've updated the original message, sorry :)

[kamilmysliwiec]

If you're using swagger, then you should use PartialType from @nestjs/swagger, not @nestjs/mapped-types