action.ts

type Dispatch = any;

type Action<T> = (dispatch: Dispatch) => Promise<T>;

const actionA: (string) => Action<string> =
(foo) => async (dispatch) => {
    dispatch('tell redux to do something');
    return 'foo';
}

const actionB: (string) => Action<number> =
(bar) => async (dispatch) => {
    dispatch('tell redux to do something else');
    return 42;
}

const actionC: (string) => Action<number> =
(baz) => async (dispatch) => {
    const resultA = await actionA(baz)(dispatch);
    dispatch('foo');
    const resultB = await actionB(resultA)(dispatch);
    dispatch('bar');
    return resultB;
}