Swagger plugin incorrectly parses optional fields

I’m submitting a…

[x] Regression 
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Minimal reproduction of the problem with instructions

1. Enable “@nestjs/swager/plugin”
2. Create following DTO

OptonalPropDto {
  field?: string;
}

1. Check output swagger document

            "OptonalPropDto ": {
                "type": "object",
                "properties": {
                    "field": {
                        "type": "object"
                    }
                }
            }

Field type should have “string” value.

What is the motivation / use case for changing the behavior?

Environment

Downgrading @nestjs/cli helps to resolve the issue.

"@nestjs/swagger": "4.2.8"
"@nestjs/cli": "6.14.2"

 
For Tooling issues:
- Node version: 12.15
- Platform:  Windows

Others:

[kamilmysliwiec]

It should be fixed in 4.2.11

[lock[bot]]

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