Trying to dynamically set interface based off of enum value

Question

Hey all I'm trying to dynamically set a style interface to a type like this:

type IListStyles = {
    [LIST_TYPE.ADD_ACTIONABLE]: IListItemAddActionableStyle;
    [LIST_TYPE.SUPERVALUE]: IListItemSupervalueStyle;
}

enum LIST_TYPE {
  ADD_ACTIONABLE = "ADD_ACTIONABLE",
  SUPERVALUE = "SUPERVALUE",
}

export interface IListItem<T extends LIST_TYPE> {
  style?: IListStyles[T];
  type: T;

Buuut I'm getting that T can't be used to index IListStyles has anyone done something like this before?

Answer 1

you can also use an object instead of enum:

const LIST_TYPE = {
    ADD_ACTIONABLE: "ADD_ACTIONABLE",
    SUPERVALUE: "SUPERVALUE",
} as const;

type TLISTTYPE = typeof LIST_TYPE[keyof typeof LIST_TYPE];

interface IListItemAddActionableStyle {
    a: string;
}
interface IListItemSupervalueStyle {
    b: string;
}

type TListStyles = {
    [LIST_TYPE.ADD_ACTIONABLE]: IListItemAddActionableStyle;
    [LIST_TYPE.SUPERVALUE]: IListItemSupervalueStyle;
};

export interface IListItem<T extends TLISTTYPE> {
    style?: TListStyles[T];
    type: T;
}

const resu: IListItem<"ADD_ACTIONABLE"> = {
    type: "ADD_ACTIONABLE",
    style: { a: "dskqldq" },
};

console.log({ resu });