defineModel is not reactive

[RonanRobineau]

Hi,

I have a weird behavior with a defineModel, it is not reactive.
the only way to trigger a change is to change the value inside the input.

Here is a playground with the issue: https://play.vuejs.org/#eNp9Uktv2zAM/iuELnaAzD5spyAZ9kAPG7AHut2qHjybTtXKkiBRXgrD/72U3KRpUdQn83uIHylN4rNz1RhRbMQ2tF45goAU3Udp1OCsJ5jAYw8z9N4OULC0kKa1JhA03jf3sIMOe2Xwh+1Ql0UGizXbGG6ipg1cXcO8OpoID/TSk7DnlqLIlrqGs1aXnGOX0pRX10z20bSkrIGm66BcwSQNLMJqbHTEysVwU6azl5otszTbehmTB+SCcHC6IeQK+Nt2anz85UIZFwnGd0NKuZMiHSXFE/8vEnH7T61W7R3znKNcnQk4Tded1PUiP7HT9LjAmVMtiqX7tj5LJdaCAu+gV/vqNljD95TnlKK1g1Ma/S+XlhCk2CwbSFyjtf3/PWPkI66PeHuD7d0r+G04JEyK3x4D+hGlOHHU+D3y3Im++PMz7+BE8mqiZvUb5CUGq2PKuMi+RNNx7DNdTvstvzZl9n/DxYHQhONQKWhSzlkvBb/Ar2+M/hT3ffUh+/jaxfwA4i7zag==

Do you have any ideas why?

[LinusBorg]

The default value that you set is a normal, non-reactive array

[JohnieXu]

Well, this is super confusing to me. Will it be noticed in the doc defineModel?

[LinusBorg]

Do you have a suggestion how/where to mention it?

The docs already explain that defineModel adds a prop (much like defineProp), and in my perception, it's pretty clear that the content of props is never made reactive by Vue - you always get exactly the value from a prop that was passed in.

So, props default values are also never made reactive for you, wether you define them in defineProps/withDefaults or in defineModel

[tetezi]

#10663
I had the same question before and you can refer to this answer