为了实现自定义撤消/重做功能，我按照https://redux.js.org/recipes/implementing-undo-history中的说明进行了修改以适应我自己的减速器。现在，当我尝试运行代码时，我得到了过去、现在和未来未定义的错误。该错误不会出现在最初的情况下，而只会出现在ActionTypes.LAYOUT_SET_MOVES,ActionTypes.LAYOUT_UNDO_MOVES和ActionTypes.LAYOUT_REDO_MOVES情况下。
我已经搜索了代码并将状态变量与其他减速器进行了比较，但没有发现明显的原因。如果您能指出我正确的方向，我将不胜感激。
完整的减速器代码如下。
谢谢。
export const layout_moveData = (state = {
past: [],
present: null,
future: []
}, action) => {
switch (action.type) {
case ActionTypes.LAYOUT_DESKS_LOADED:
return { ...state, present: action.payload, past: [], future: [] };
case ActionTypes.LAYOUT_RESTORE_ALL:
return { ...state, present: action.payload, past: [], future: [] };
case ActionTypes.LAYOUT_SET_MOVES:
let previousSet = [...past, present];
return { ...state, past: previousSet, present: action.payload, future: [] };
case ActionTypes.LAYOUT_UNDO_MOVES:
if (past.length === 0) return state;
let previous = past[past.length - 1];
let newPast = past.slice(0, past.length - 1);
return { ...state, past: newPast, future: [present, ...future], present: previous };
case ActionTypes.LAYOUT_REDO_MOVES:
let next = future[0]
let newFuture = future.slice(1)
return { ...state, past: [...past, present], present: next, future: newFuture };
default:
return state
}