Observables don't seem to work correctly with function in object

[RickLucassen]

Intended outcome:
We should be able to extend an observable object, keeping the predefined properties intact, including functions.

Actual outcome:
When extending/printing an observable object with a function in it it will disappear.

How to reproduce the issue:
MobX 5: https://codesandbox.io/s/competent-dijkstra-3z6jm
MobX 6: https://codesandbox.io/s/keen-bas-7t0is

As you can see the function is still present when using MobX 5.

[urugator]

This is by design. Since Mobx6 all functions become autoActions - the field isn't observable and therefore is not enumable. Since spread syntax copies only own enumerable props, the function "disappears".
However, you're not the first one surprised by this, so there is already a PR that changes the behavior to be closer to mobx5.
Until then, you can explicitely annotate the function with observable (and optionally wrap the function in action if that's the intention)

[RickLucassen]

Thanks for the answer, I will close this issue then.
We will monitor the progress on that PR :)