Editing Openai/694590c5-f52c-800f-9af6-d10143a2d812 (section)

=== Assistant: Short answer: yes — every dispatched action is broadcast to the whole store, and any slice that has a case matching tha… ===
Short answer: yes — every dispatched action is broadcast to the whole store, and any slice that has a case matching that action will run its reducer for it. There’s no implicit one-way restriction.

Key points:
* dispatch(userLoggedOut()) sends an action { type: 'auth/userLoggedOut', ... } to the store. - The auth slice reducer (if it defines that case) will run. - Any other slice that called builder.addCase(userLoggedOut, ...) will also run its case reducer (e.g., postsSlice clearing posts).
* dispatch(postUpdated(...)) behaves the same: all reducers see the action; only slices that declared a case for that action will change state.

Important distinctions:
* Actions are just plain objects with a type. Reducers decide whether to react. Nothing “calls functions in other slices” automatically except the reducers that explicitly handle that action.
* If you want multiple things to happen as part of a logical operation, either: - dispatch a single shared action (and have other slices handle it via extraReducers), or - dispatch multiple actions from a thunk: dispatch(doA()); dispatch(doB());
* Middleware/listeners (thunks, createListenerMiddleware) can run extra side effects when actions are dispatched.
* Don’t dispatch inside reducers. Use middleware/thunks for side effects or chained dispatches.

Example:

<syntaxhighlight lang="ts">// authSlice exports userLoggedOut
builder.addCase(userLoggedOut, state => { /'' auth cleanup ''/ })

// postsSlice
builder.addCase(userLoggedOut, () => initialPostsState) // reacts to logout
// but postsSlice won't react to postUpdated unless it explicitly handles it

</syntaxhighlight>