ScriptingBridge which was a layer to formally connect other languages to OSA is still there (unsure about 10.10), but neglected. It was introduced in 10.5 along

ScriptingBridge which was a layer to formally connect other languages to OSA is still there (unsure about 10.10), but neglected. It was introduced in 10.5 along with official support for PyObjC and RubyCocoa in that release. Apple also touted being able to do the same from Objective-C. Other 3rd party language bridges such as LuaCocoa and JSCocoa provided ScriptingBridge support.