[tkp]

Heaps has it's own API, but other Haxe frameworks[1][2] reimplement the flash API. Some tools[3][4] help to convert AS3 source code to Haxe, and the typing and compiler are helpful to identify issues. So depending on the size and dependencies, conversion can be easy once you get past the main language differences.

[1] https://www.openfl.org/ [2] https://github.com/haxenme/NME [3] https://github.com/HaxeFoundation/as3hx [4] https://github.com/innogames/ax3