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Dart transpiles to Javascript already - not exactly native support, but practically the next best thing.

That being said, I'm also 100% behind the effort to standardize WASM as the cross-platform compilation target of choice.

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If you transpile to javascript the performance will never exceed that of Javascript. Typescript is a bit silly in that aspect because it removes all the types that the developers put in, they aren't used to improve time or memory performance at all.

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