Why are Ref given as a lambda ?

[luzzardik]

Hi ! I'm trying to understand why the docs asks us to give the refs as such @prop({ref : () => MyRef}), is there any reason ?
Couldn't we just use @prop({ref : MyRef}) ?

Thanks !

[hasezoey]

Please read the documentation Reference other Classes: Common Problems

small snippits:

If () => is not used, there can be problems when the class (/ variable) is defined after the decorator that requires it.

Because of the order classes are loaded and reordered at runtime, this might result in some references being null / undefined / not existing.

The new () => Class is meant to help with Circular Dependencies, but cannot remove the problems in all cases, see Circular Dependencies for more.