NgRx - The Complete Guide

Author: Your Name

src/app/reducers/index.ts

@@ -16,6 +16,19 @@ export const reducers: ActionReducerMap<AppState> = {
     router: routerReducer
 };
 
+export function logger(reducer:ActionReducer<any>)
+    : ActionReducer<any> {
+    return (state, action) => {
+        console.log("state before: ", state);
+        console.log("action", action);
+
+        return reducer(state, action);
+    }
+
+}
+
 
 export const metaReducers: MetaReducer<AppState>[] =
-    !environment.production ? [] : [];
+    !environment.production ? [logger] : [];
+
+