Speak Coroutines with Deferred

YourOldSyncLibrary.kt

class YourOldSyncLibrary {
    val imageCompressor = ImageCompressor()
    
    fun doSomethingSync(): Deferred<String> {
        val 
        imageCompressor.compress(object: OnCompressListener {
           override fun onCompress(filePath: String) {
           
           }
           
           override fun onError(exception: Exception) {
           
           }
        })
        return 
    }
    
}

Deferred executes simultaneously with another deferred when you call await on both