improve uglify compilation options

compiler.js

@@ -50,12 +50,42 @@ var _compile = function(code, opts, mainModule) {
 		mangle:true,
 		output: {
 			// http://lisperator.net/uglifyjs/codegen
-			max_line_len:200,
-			semicolons:false
+			indent_start  : 0,     // start indentation on every line (only when `beautify`)
+			indent_level  : 4,     // indentation level (only when `beautify`)
+			quote_keys    : false, // quote all keys in object literals?
+			space_colon   : true,  // add a space after colon signs?
+			ascii_only    : false, // output ASCII-safe? (encodes Unicode characters as ASCII)
+			inline_script : false, // escape "</script"?
+			width         : 80,    // informative maximum line width (for beautified output)
+			max_line_len  : 200, // maximum line length (for non-beautified output)
+			ie_proof      : true,  // output IE-safe code?
+			beautify      : false, // beautify output?
+			source_map    : null,  // output a source map
+			bracketize    : false, // use brackets every time?
+			comments      : false, // output comments?
+			semicolons    : true  // use semicolons to separate statements? (otherwise, newlines)
 		},
 		compress: {
 			// http://lisperator.net/uglifyjs/compress
-			unsafe:false
+			sequences     : true,  // join consecutive statemets with the “comma operator”
+			properties    : true,  // optimize property access: a["foo"] → a.foo
+			dead_code     : true,  // discard unreachable code
+			drop_debugger : true,  // discard “debugger” statements
+			unsafe        : false, // some unsafe optimizations (see below)
+			conditionals  : true,  // optimize if-s and conditional expressions
+			comparisons   : true,  // optimize comparisons
+			evaluate      : true,  // evaluate constant expressions
+			booleans      : true,  // optimize boolean expressions
+			loops         : true,  // optimize loops
+			unused        : true,  // drop unused variables/functions
+			hoist_funs    : true,  // hoist function declarations
+			hoist_vars    : false, // hoist variable declarations
+			if_return     : true,  // optimize if-s followed by return/continue
+			join_vars     : true,  // join var declarations
+			cascade       : true,  // try to cascade `right` into `left` in sequences
+			side_effects  : true,  // drop side-effect-free statements
+			warnings      : false, // warn about potentially dangerous optimizations/code
+			global_defs   : {}     // global definitions
 		}
 	})
 	// also see result.map