Im trying to create a custom component, as described in the wiki. This is on UE4 4.22.3, unreal.js from marketplace.

let Compile = function(x) {  
    return require('uclass')()(global, x);
}

class CustomComponent extends MeshComponent {
    ctor() { }

    properties() {
        this.X /*EditAnywhere+int*/;
    }
}

let CustomComponentClass = Compile(CustomComponent)

Running this code outputs:
Javascript: Warning: Create UClass(CustomComponent_C0) Elapsed: 0.000244

But CustomComponent_C0 doesnt show up in the list of available components when trying to add to anything.
It shows up in the list of classes to inherit from when making a new blueprint though, and if I use class flag BlueprintType, it shows up as a possible variable type in bps too, it just doesnt show when trying to add it as a component.

Further more, although this might just be my missunderstanding, as Im not sure if this is even supported, if I make a new blueprint and pick CustomComponent_C0 as its parent, ue4 crashes.
In the logs: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000c8

I also have a question, do javascript generated classes exist as actual files anywhere on the file system after being compiled?

As you can probably see, Im new to unreal.js and ue4, so I might just be misunderstanding things here. I appreciate your patience and answers in advance.