Hello all,

Last night, I decided to implement some AST modifying pass, and created
esmangle : mangling tool for Mozilla Parser AST.
http://constellation.github.com/esmangle/

This is created yesterday and test cases are very few, so it is still
experimental. :)

We can use it like this,

var first = esprima.parse(code);
var tree =esmangle.mangle(first);
var res = escodegen.generate(first, { format: { compact: true, semicolons:
false, renumber: true, hexadecimal: true, escapeless: true } });

You can try this on the demo page.

To get more compression ratio, we should create AST modifying pass like

+ remove wasted block. (`if (cond) { stmt; }` => `if (cond) stmt;)
+ reordering declarations
+ concat multiple var declarations into one

Thanks.

Quite impressive!

I'd assume you would look into comparing the result with UglifyJS, or even
its new UglifyJS 2.

As for non-mangling syntax simplification, should this be another
(micro)library? It could be still useful for pure optimization purposes,
even without further mangling step.

--
Ariya

Thanks!

I'd assume you would look into comparing the result with UglifyJS, or even