I have an interface [simplified]

export default interface FormListarAtendimentosDTO  {
    idArea?: number;
    idAssunto?: number;
    idMotivo?: number;
    order?: string;
    page?: number;
    pageSize?: number;
}

I have an instantiated query object with:

let form:FormListarAtendimentosDTO = { order: "ASC", page: 1, pageSize: 10 }

I have an updateQuery object with

let updateQuery = {queryParam: "idArea", value:"10"}

I want to check if obj.queryParam is a valid key on FormListarAtendimentosDTO, so I can update form to include the value on updateQuery. How do I do that?

if(keyExistsInInterface("idArea", FormListarAtendimentosDTO ))
{
    form.idArea = value
}

I tried to use

form.hasOwnProperty("idArea") and got false, because the value wasn't initialized
form.hasOwnProperty(updateQuery.queryParam) (same thing)

I tried

type K = keyof FormListarAtendimentosDTO

but i’m don’t know how to use this information.

I tried

if("idArea" in formListarAtendimentosDTO)

didn’t work either, always returned false