Thank you for answering! I have googled and found two resources that may be handy for you:
http://www.openfl.org/ - Which has a similar look/feel/functionality to the old Flash API
https://haxe.org/ - A very actively developed toolset/API that can be used with OpenFlL
You can also transfer the project to CC Animate and rewrite the project in Javascript in place of ActionScript.
There's also other resources out there for transferring Actionscript to Typescript!