The output type of a function given an input

Essentially, I have successfully rendered a return type for my combined reducers using the following code:

const rootReducer = combineReducers({
  notes: notesReducer,
  categories: categoriesReducer,
  flyout: flyoutReducer
  // more reducers
});

export type AppState = ReturnType<typeof rootReducer>;

However, when attempting to accept a parameter in the function, I am struggling to correctly return the types. See example below:

const rootReducer = history =>
  combineReducers({
    router: connectRouter(history),
    page: pageReducer,
    ....
    ....

export type AppState = ReturnType<typeof rootReducer>;

How can I properly call the function to get the same returned types?

javascripttypescript

Answer №1

To achieve this, simply utilize the ReturnType function twice:

const rootReducer = history =>
    combineReducers({
        router: connectRouter(history),
        page: pageReducer,
    });

export type AppState = ReturnType<ReturnType<typeof rootReducer>>;

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