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You're talking about two different things. Haxe is a different language, while TS is a superset of JS (all JS is valid TS).

JS -> Haxe requires rewriting 10k lines before the program will run.

JS -> TS requires changing the file names, doing some imports, and adding "any" in a few places. The program will then run, and type information can be added gradually.

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I do not see that much of differences between Haxe and JS, mostly because Haxe is a superset of EcmaScript. However the process is not that automatic because TypeScript is more permissive I would say (though there is already a convertor from typescript to haxe: ts2hx).

But that said, I am not really that much experienced with TypeScript.

According to Wikipedia, Haxe is not a superset of ES:

"Haxe is similar to ECMAScript, although almost no ECMAScript code will run on Haxe without modifications."

haxe have some incompatibility with syntax js. like don't support classic for and in if statement null must be explicited (you must do if (x==null)). but thanks to macros the porting of js generic more simple.

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