Function reducer

packages/react/test/redux.test.ts:433–441

(state: Record<string, unknown> = initialState, action: { type: string; newValue: any })

    const ACTION_TYPE = 'UPDATE_VALUE';
    const reducer = (state: Record<string, unknown> = initialState, action: { type: string; newValue: any }) => {
      if (action.type === ACTION_TYPE) {
        return {
          ...state,
          value: action.newValue,
        };
      }
      return state;
    };

    const store = Redux.createStore(reducer, enhancer);