remove coupling by moving implementation details to component

Author: piotrwitek

src/reducers/currency-converter-reducer.tsx

@@ -8,18 +8,10 @@ const UPDATE_BASE_VALUE = 'currencyConverter/UPDATE_BASE_VALUE';
 const UPDATE_TARGET_VALUE = 'currencyConverter/UPDATE_TARGET_VALUE';
 
 // Action Creators
-export const updateBaseCurrency = createAction(UPDATE_BASE_CURRENCY, (event) => {
-  return event.target.value;
-});
-export const updateTargetCurrency = createAction(UPDATE_TARGET_CURRENCY, (event) => {
-  return event.target.value;
-});
-export const updateBaseValue = createAction(UPDATE_BASE_VALUE, (event) => {
-  return event.target.value;
-});
-export const updateTargetValue = createAction(UPDATE_TARGET_VALUE, (event) => {
-  return event.target.value;
-});
+export const updateBaseCurrency = createAction<string>(UPDATE_BASE_CURRENCY);
+export const updateTargetCurrency = createAction<string>(UPDATE_TARGET_CURRENCY);
+export const updateBaseValue = createAction<number>(UPDATE_BASE_VALUE);
+export const updateTargetValue = createAction<number>(UPDATE_TARGET_VALUE);
 
 // Reducer
 const initialState = Immutable({