JSX is useful not just for advanced string interpolation but for representing/generation of tree alike structures / literals in PL. JSX is not only about HTML but XML too.
I don't know how JSX is made in LuaX but in my QuickJS fork [1] JSX allows to generate as tree literals as procedure calls (JSX(tag,props,kids)) that can be used for various purposes - DOM population, VDOM generation, HTML/XML string composition, etc.
And being embedded into a compiler JSX a) prevents common mistakes like non-closed tags and b) effective internalization ( translation happens at compile time once ).
I don't know how JSX is made in LuaX but in my QuickJS fork [1] JSX allows to generate as tree literals as procedure calls (JSX(tag,props,kids)) that can be used for various purposes - DOM population, VDOM generation, HTML/XML string composition, etc.
And being embedded into a compiler JSX a) prevents common mistakes like non-closed tags and b) effective internalization ( translation happens at compile time once ).
[1] JSX implementation for QuickJS : https://gitlab.com/c-smile/quickjspp/-/blob/master/quickjs-j...