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Comment by kaoD | Hacker News Reader

JS and JSX are isomorphic (in the mathematical sense) hence why JSX is considered just syntactic sugar.

JS and TS aren't isomorphic (there's no inverse morphism once you go TS->JS that can bring the resulting JS back to the original TS) hence why TS is a different language (even if a superset of and compiled to JS).

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> JS and JSX are isomorphic

They are not

Or, if they are, they are in the same way of a custom XML templating language that can be translated to a specific javascript library implementation and then back to XML

In the same way, is Mustache isomorphic?

    "{{title}} spends {{calc}}"

can be translated to

    `${title} spends ${calc}`

and back to

    "{{title}} spends {{calc}}"

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