Immer: How to reset draft to initial state and then update it without spread operator?

[lizagilman]

In a redux reducer, here is an initial state:

const initialState = {
  logs: {
    error: false,
    errorMessage: '',
    pending: false,
    fulfilled: false,
    lines: '',
  },
};

I would like to first reset to this state and then update lines.

One way I can do that -
return { logs: { ...initialState.logs, lines: action.payload.data } }

Another way (which I'm not 100% sure is right) -

draft.logs = { ...initialState.logs };
draft.logs.lines = action.payload.data;

What would be the best way to do that? Can it be done without using spread?

Thanks.

(using latest immer version)

Thanks in advance.

[mweststrate]

I'd try Object.assign(draft, initialState); draft.logs.lines = action.payload.data.

Note that this doesn't strictly reset draft, as it won't remove keys that are present on state but didn't exist in the initialstate. If that is necessary, you could create a fresh draft from the initial state and return that (although it is probably simpler to not use immer in that very specific case):

const newStateDraft = createDraft(initialState)
newStateDraft.logs.lines = action.payload.data)
return finishDraft(newStateDraft)

```

[mweststrate]

Closing as answered. Will reopen in case the answer doesn't suffice :)

[lizagilman]

Thanks @mweststrate !