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I think it was more that Unity's "JS" was actually their own language that was just very similar to real Javascript. They were forced to support the language itself as well as the integration. It was a lot easier to just support C#, which is maintained by others.

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Hmm. Cocos Creator manages JavaScript/TypeScript ontop of their bespoke (ios:Obj-C++, Android: Java) + C++ native stack and they don't have that many engineering resources. Granted, they did have multiple breaking non-backwards compatible re-architecturings of their engine(s), along the way.

Cocos is likely using actual JavaScript. When I used Unity's JS dialect (a very long time ago, to be fair) it was very much not traditional JS and was its own beast, so Unity likely was having to do a lot of work on it.

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