boa_engine 0.19.0

Boa is a Javascript lexer, parser and compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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(function () {
  let num = 12;

  function fib(n) {
    if (n <= 1) return 1;
    return fib(n - 1) + fib(n - 2);
  }

  return fib(num);
})();