fix: class-validator validate union type

[benjaballah]

I have a schema, which mean the data will be different according to one of the attributes.
When I try to run this code I not get error of validate if i send wrong type

class BaseFeature {
  kind: 'size' | 'color'
}

class ColorFeature extends BaseFeature {
  kind: 'color'
  color: string
}

class SizeFeature extends BaseFeature {
  kind: 'size'
  size: number
}


class Feature {
  name: string

  @ValidateNested({ each: true })
  @Type(() => BaseFeature, {
    keepDiscriminatorProperty: true,
    discriminator: {
      property: 'kind',
      subTypes: [
        { value: SizeFeature, name: 'size' },
        { value: ColorFeature, name: 'color' },
      ],
    },
  })
  option: (SizeFeature | ColorFeature)[];
}

What is the correct way to validate the Feature class so that it only accepts 2 different kinds?