You don't. You can call synchronous functions from async functions just fine and vice versa. The syntax isn't identical but I don't understand this split the world meme.
def sync_foo():
task = async_bar()
loop = asyncio.new_event_loop()
return loop.run_until_complete(task)
task.RunSynchronously()
There’s a split, because every step of an async process has to be async/await compatible or you lose all benefit. In a small code base, this might not be a big problem. Where I work it will never realisticly be done.
With project loom we won’t have to do anything or learn anything new. Just upgrade the java runtime and everything just works better :)
But yeah, the magic is: All code is now implicitly async (except native calls) - as if all code always had async in it's signature. Just - there is no need to now add this to the signature.