Function parse has a Cognitive Complexity of 245 (exceeds 5 allowed). Consider refactoring.

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export function parse(code) {
  function fallback(sexp) {
    var elts =
      sexp instanceof Array ? parseStar(sexp) : [parseExprSingleton(sexp)];
    var guess = new structures.unsupportedExpr(elts, "Parse error");

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Avoid too many return statements within this function.

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      return (function () {
        var res = new structures.quotedExpr(sexp);
        res.location = sexp.location;
        return res;
      })();

Avoid too many return statements within this function.

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      return fallback(sexp);

Avoid too many return statements within this function.

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      return parseExpr(sexp);

Avoid too many return statements within this function.

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        return new structures.defVar(
          parseIdExpr(sexp[1]),
          parseExpr(sexp[2]),
          sexp
        );