get every Math constants and functions in less.js

less-math.js

if( '__proto__' in {} ) {
    tree.functions = Math.__proto__;
} else {
    var mathFn = 'E LN2 LN10 LOG2E LOG10E PI SQRT1_2 SQRT2 abs acos asin atan atan2 ceil cos exp floor log max min pow random round sin sqrt tan'.split(' ');
    for (var i = 0; i < mathFn.length; i++) {
          tree.functions[mathFn[i]] = Math[mathFn[i]];
    }
}