CounterIncrement.ts

async function postEffect(url: string, xsrfToken: string, data: any = {}) {
    let response = await fetch(url, {
        method: 'POST',
        credentials: 'include',
        headers: {
            'Content-Type': 'application/json',
            'X-XSRF-TOKEN': xsrfToken
        },
        body: JSON.stringify(data)
    });
    return response;
}

export const actionCreators = {
    increment: (): AppThunkAction<KnownAction> => async (dispatch, getState) => {
        dispatch({ type: Server.INCREMENT_COUNTER });
        var state = getState();
        let response = await postEffect('/incrementcounter', state.session.xsrfToken);
    }
    // [ ... other async actions ]
};