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WebAssembly is a binary representation of the Javascript AST. Optimizations usually happen AFTER it is parsed. That's all WebAssembly is -- the parsed result. Targeting WebAssembly from Javascript is the most natural fit that could possibly exist.

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Not quite. WebAssembly is not a representation of general JS. It can just represent a small subset of it, very similar to the asm.js subset.

Good to know. So it doesn't implement any of the ES6 concepts then I take it.

The format is just an AST in general, nothing to do with JavaScript. You can even see all the possible instructions here to confirm [1].

1. https://github.com/WebAssembly/design/blob/master/AstSemanti...

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