SyntaxError with native private properties

[rklos]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

I use native private properties inside my DB entity to prevent them from being exposed by accident to the users. It is needed because I also use typeorm's lifecycle decorators to run some logic eg. hashing password (and I need to store previous password inside the private property)

The nest's swagger plugin copies a transformed content of entities into _OPENAPI_METADATA_FACTORY static property, but it leaves private properties in their place.

The problem is that the whole app fails to run because private properties are allowed only inside classes but not in object literals.

Minimum reproduction code

https://github.com/rklos/nestjs-swagger-repro-repo

Steps to reproduce

1. yarn
2. yarn build
3. yarn start:dev

Expected behavior

Private fields should be omitted when creating _OPENAPI_METADATA_FACTORY

Package version

11.0.5

NestJS version

11.0.9

Node.js version

22.14.0

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

/nestjs-swagger-repro-repo/dist/user.entity.js:34
        return { id: { required: true, type: () => Number }, username: { required: true, type: () => String }, email: { required: true, type: () => String, format: "email" }, password: { required: true, type: () => String }, isActive: { required: true, type: () => Boolean }, isAdmin: { required: true, type: () => Boolean }, #tempPassword: { required: true, type: () => String } };
                                                                                                                                                                                                                                                                                                                                      ^^^^^^^^^^^^^

SyntaxError: Unexpected identifier '#tempPassword'
    at wrapSafe (node:internal/modules/cjs/loader:1486:18)
    at Module._compile (node:internal/modules/cjs/loader:1528:20)
    at Object..js (node:internal/modules/cjs/loader:1706:10)
    at Module.load (node:internal/modules/cjs/loader:1289:32)
    at Function._load (node:internal/modules/cjs/loader:1108:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:220:24)
    at Module.require (node:internal/modules/cjs/loader:1311:12)
    at require (node:internal/modules/helpers:136:16)
    at Object.<anonymous> (/nestjs-swagger-repro-repo/src/app.service.ts:2:1)

Node.js v22.14.0

I cannot use @ApiHideProperty because of some Typescript's restrictions

[kamilmysliwiec]

Would you like to create a PR for this? You could use private as a temporary fix

[rklos]

@kamilmysliwiec I've just made a PR

[kamilmysliwiec]

Let's track this here #3324