使用NGRX或NGXS时是否自动实现所有领域实例的对象不可变性？

Great question—this is a super common point of confusion, especially with those mixed messages in docs! Let’s break it down clearly:

NGRX: No automatic immutability, but it’s a core requirement #

NGRX is built around pure reducers that return new state instead of modifying the existing one. But here’s the key detail: the framework doesn’t force immutability for you. If you accidentally mutate the original state object in a reducer (like state.user.name = "New Name"), NGRX won’t throw an error—but your app will break in subtle ways, because the store won’t detect the state change (since the object reference hasn’t changed).

Those docs saying "when using NGRX with immutable objects" are emphasizing that you, the developer, need to ensure immutability—the framework expects it, but doesn’t enforce it automatically. You don’t need immutable.js for this, though:

• Native JavaScript tools work perfectly: spread operators ({ ...state, user: newUser }), Object.assign, array methods like map(), filter(), or concat() that return new arrays instead of modifying the original.
• If you find manual immutable operations tedious, you can integrate Immer with NGRX (it’s officially supported) to write "mutable-looking" code that gets converted to immutable updates under the hood.

NGXS: Automatic immutability out of the box #

NGXS takes a different approach—it uses Immer by default. This means you can write code that looks like you’re mutating state (e.g., state.user.name = "New Name"), and NGXS will automatically create a new immutable state object for you. You don’t have to worry about manual immutable operations or extra libraries here—it’s all handled internally.

Should you use immutable.js with either library? #

Short answer: No, you don’t need it.

• immutable.js creates special immutable data structures that aren’t native JS objects, which adds overhead (you have to convert between them when interacting with Angular templates or other parts of your app).
• Native JS methods or Immer are lighter, more intuitive, and fit better with the Angular ecosystem.

To sum up:

• NGRX requires you to handle immutability manually (via native tools or Immer), but doesn’t enforce it automatically.
• NGXS handles immutability automatically via Immer.
• Skip immutable.js—it’s unnecessary and adds complexity.

内容的提问来源于stack exchange，提问作者Ole