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Hi,

Thanks for Yui-compressor!

Some observations:

Yui-compressor can expand code size by inserting unnecessary braces:

function x(y){if(y)return 1;return 0}

becomes:

function x(a){if(a){return 1}return 0};

(also not sure why the trailing ';' gets added).

Other optimisations that I think might not be too difficult to implement:

Combine multiple var statements: "var a;var b;" could become just "var a,b;". This can also be worthwhile for non-consecutive var statements with initialisers:

var a=1;f(a);var b=g(2);h(b);

becomes

var a=1,b;f(a);b=g(2);h(b);

saving 2-characters.

Converting ';' to ',' can sometimes save the need for braces, saving a character or two:
if(a){f();g()} becomes if(a)f(),g();