Exploring the world of typescript with the power of ts-check

I'm having trouble figuring out how to work with a generic function using TypeScript's new ts-check feature.

/**
 * @type {Reducer<IPoiState, any>}
 */
const poi = handleActions({
  [ADD_BOOKMARK_START]: (state) => {
    return { ...state };
  },
}, {});

The handleActions type is from Definitey Typed and has the following structure...

export function handleActions<State>(
    reducerMap: ReducerMap<State>,
    initialState: State
): Reducer<State, any>;

However, I am encountering an error that states...

Type 'Reducer<{}, any>' is not assignable to type 'Reducer<IPoiState, any>'.
  Type '{}' is not assignable to type 'IPoiState'.

Is there a way to bypass this generic constraint?

Answer №1

To change the type of an object, you can use casting or type assertion by placing the desired Type in angle brackets like this: <NewType>{}.

Check out more information on Type Assertion

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