List.delete() returns an empty array

[fork88888]

Dear developers.

I'm using Immutable.js v4.0.0 with Vue 3.2.29 + typescript

The arrayOfItems.value is a List of objects and it contains 7 items and the index variable is 5.
If I run the following code:

arrayOfItems.value = arrayOfItems.value.withMutations(x => {x.delete(index);});

then I get the empty array instead of the array that excludes object by index only. arrayOfItems.value and x will be equal [] after invoking delete. The behaviour of remove method is the same.
It seems that its a wrong behaviour.

[georg-getz]

I have the exact same problem, version is 3.8.2.

P.S. remove is an alias for delete, that's the reason they are both bugged.

[jdeniau]

Hi !

I do not know why for now, but in the delete documentation, you can read that:

Note: delete cannot be used in withMutations.

So it's not considered as a bug. But we should either authorized this, if possible, or improve de DX there.

You can see Lee's response here : #228 (comment)

[georg-getz]

Hi @jdeniau
I followed the issue you linked and it seems people were confused about this behaviour 8 years ago as well and all that changed was that the note you quoted was added to the docs. Is it safe to assume that delete/remove will never work with withMutations/asMutable?

[jdeniau]

@georg-getz If you have another solution (like not using withMutation), I suggest you to take that solution 😉

I do not know that exact part, but as Lee only updated the doc, I think that it might be really difficult to make it work.

I think that a possible "solution" may be to log a warning or mark this comportment as @deprecated or somethink like that though.