question: how to provide a type for each array element individually

[egarkavy]

I was trying to make a class that holds an array of base classes which may be of different inherited types.
I tried to use @type decorator and assumed there is a way to get an internal 'current' element of the array to be parsed but instead (and it's logical) I get a parent object where property which I put @type decorator is defined
Please check a code snipped below: aggregate object which stores an array of actions to do and these actions may be of 2 types

export enum Action {
    Add = 'ADD',
    Delete = 'DELETE'
}

export class ManageChildEntitiesDto {
    @IsString()
    public parentEntityId: string;

    @IsArray()
    @ValidateNested()
    @Type((tho) => {
        if (!tho) {
            return ChildActionDto;
        }

        switch ((tho.object as ChildActionDto).action) { //This type cast is not correct due to tho.object is acually of ManageChildEntitiesDto  type. So the following code will not fall into any of case blocks
            case Action.Add:
                return AddActionDto;
            case Action.Delete:
                return DeleteActionDto;
        }
    })
    actions: (AddActionDto | DeleteActionDto)[];
}

export class ChildActionDto {
    @IsEnum(Action)
    action: Action;
}

export class AddActionDto extends ChildActionDto {
    override action: Action.Add;

    newEntity: UpsertFeatureVariantDto;
}

export class DeleteActionDto extends ChildActionDto {
    override action: Action.Delete;

    id: string;
}

So during debugging it's clearly seen that the tho.object is a parent object rather than a particular array item

Please, help me to figure out how to use this @type decorator so that I can tell class transformer what nested type to use for each array item.