I searched for it one day and didn't found anything.
But there's Pffff which contains a JavasScript parser and a beginning of AST analyser :

https://github.com/facebook/pfff/tree/master/lang_js

2012/7/25 Diego Olivier Fernandez Pons <dofp.ocaml@gmail.com>
    Caml-list,

Does anyone have a JavaScript interpreter in OCaml ? Doesn't need to
be 100% compliant, the user can always rewritte some parts of the
JavaScript. And we discourage using weird / complex JavaScript
constructions anyway. Alternatively, a JavaScript -> OCaml source to
source translator could be good as well.

        Diego Olivier

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