I have a simple function that takes an object in parameter. In order to receive only valid data, I need to type the key of the object as such:

type DataType = about | favorites | username;

type UpdatedData = { [key in DataType]: any };



function onSave (updatedData: UpdatedData){

//do stuff

}



// in a component

const onClickSave = () => onSave({ about: text });

Typescript throws the following error:

Argument of type '{ about: text; }' is not assignable to parameter of type 'UpdatedData'.
Type '{ about: text; }' is missing the following properties from type 'UpdatedData': favorites, username

How to fix this? Of course, I could write [key: string] instead of [key in DataType] but the typing would be useless then.