Cooking

Current version of UnrealEngine doesn't handle plugins with Content correctly. For a workaround you may copy Plugins/UnrealJS/Content into cooked target manually.

While cooking a shipping version, UnrealEngine strips all assets which are not referenced by root assets. Cooker doesn't know anything about *.js, so Resource.Loaded assets will not be included in the final shipping version. As a remedy for this problem, JavascriptComponent has Assets and ClassAssets which are key-value store containing FStringAssetReference and TSubclassOf<UObject>. Those assets can be accessed via Root.ResolveAsset(asset-name,true/*true for load*/) and Root.ResolveClass(asset-name).

Before

class MyChildActor extends Blueprint.Load('/SomeNice').GeneratedClass {}

After

class MyChildActor extends Root.ResolveClass('blueprint') {}

Non native project which doesn't have a single c++ class cannot be baked with game plugins. So if you have installed Unreal.js as a game plugin, you should switch your project into c++ project by adding a dummy native class.

Packaging

Not to lose your Content/Scripts folder, please add your Content/Scripts to Package Settings - Additional Non-Asset Directories to Copy