TypeScript with "--module amd"

string-util.js

define(["require", "exports"], function(require, exports) {
    var StringUtil = (function () {
        function StringUtil() { }
        StringUtil.truncate = function truncate(str, limit) {
            if(str.length > limit) {
                var r;
                var ret;

                r = new RegExp("^.{0," + limit + "}\\b");
                ret = r.exec(str)[0];
                if(ret.charAt(ret.length - 1) === " ") {
                    ret = ret.slice(0, -1);
                }
                ret += '...';
                return ret;
            } else {
                return str;
            }
        }
        return StringUtil;
    })();
    exports.StringUtil = StringUtil;    
})