feat(api): improved transformer param ordering

Author: Introvertuous

example/src/redux/modules/todos/transformer.js

@@ -3,11 +3,11 @@ import { attemptRemoveTodo, attemptAddTodo } from './actions';
 import { getTodo } from './selectors';
 
 export default {
-  [ADD_TODO]: (prevState, nextState, action) => {
+  [ADD_TODO]: action => {
     const { value } = action.payload;
     return attemptRemoveTodo(value);
   },
-  [REMOVE_TODO]: (prevState, nextState, action) => {
+  [REMOVE_TODO]: (action, prevState) => {
     const { payload } = action;
     const { value, done } = getTodo(prevState, payload);
     return attemptAddTodo({ value, done, index: payload });

src/lib/create_middleware.ts

@@ -61,7 +61,7 @@ function createTransformer<S>(
     return null;
   }
 
-  return () => transformer(oldState, newState, dispatchedAction, undoing);
+  return () => transformer(dispatchedAction, oldState, newState, undoing);
 }
 
 function createMiddleware<S>(

src/types/transform.ts

@@ -1,9 +1,9 @@
 import { ThunkOrAction } from './redux';
 
 export type Transformer<S> = (
+  action: ThunkOrAction<S>,
   prevState: S,
   nextState: S,
-  action: ThunkOrAction<S>,
   undoing: boolean
 ) => ThunkOrAction<S>;