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<_> should not bind.

We should wait to see what UglifyJS 2.0 will evolve to, but sooner or later we ought to swap.

For better require.js loading behavior.

I'd love to be able to declare this as a dependency in my node library, but a new version hasn't been released in 2 years. Any chance we could get a version bump and a package deploy?

Just a tweak to the example.

ast.traverseTopDown(
    'VarDecl(x)',
    function(b) {
        declared[b.x.value] = true;
    },
    'VarDeclInit(x, _)',
    function(b) {
        declared[b.x.value] = true;
    },
    'FArg(x)',
    function(b) {
        declared[b.x.value] = true;
    },
    'Var(x)',
    function(b) {
        if (!declared[b.x.value]) {
            log("Variable " + b.x.value + " is not declared.");
        }
    }
);

And requesting that acorn be updated (with a link to the commit that you're modifying somewhere before modification to make it easier to track down just what changes you're doing for future updates). Acorn now handles ECMA 3-6 where 0.4.1 didn't.

Great program, looking forward to working on it.

In parse.js there is a console.log("Not yet supported: " + nodeName) line, which feeds chrome's log buffer until it crashes. I had to comment that line to keep cloud9 usable. For me it prints these two:

• Not yet supported: TemplateLiteral
• Not yet supported: Super

Maybe, if you really want to keep that message, it would be nice to log each unsupported node type just once?

function fn(){};
(function fn(){});

all of those are parse as

  Function(
      "fn",
      [],
      []
  )

but

(function fn(){  /* fn is *Effective* in this Scope */  }());
console.log(typeof fn);// undefined  -->  but lost effective when out of "(   )";

just bumped into the library. Thinking it's still missing the line:col info and range info like esprima does: http://esprima.org/demo/parse.html

Maybe it is good to add it down the road.

From using your online demo, it seems that comments don't appear in the AST. I am aware that the standard version of Narcissus does not preserve comments, but other products, like JsShaper do preserve comments. Is this possible with treehugger?