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src/utils/reducer.ts

@@ -0,0 +1,19 @@
+// create-reducer.ts
+import { Action } from 'redux';
+
+type Handlers<State, Types extends string, Actions extends Action<Types>> = {
+  readonly [Type in Types]: (state: State, action: Actions) => State
+}
+
+// export const createReducer = <State, Types extends string, Actions extends Action<Types>>(
+//   initialState: State,
+//   handlers: Handlers<State, Types, Actions>,
+// ) => (state = initialState, action: Actions) =>
+//   handlers.hasOwnProperty(action.type) ? handlers[action.type as Types](state, action) : state;
+
+export const createReducer = (
+  initialState,
+  handlers,
+) => (state = initialState, action) => handlers.hasOwnProperty(action.type)
+  ? handlers[action.type](state, action)
+  : state;