A simple object wrapper that converts functions that return `undefined` to return an instance of the object instead, `chainifying` those calls

chainify.js

function chainify(obj, that){
  if(typeof obj === 'object'){
    that = that || {__object: obj}
    for(var i in obj){
      if(typeof obj[i] === 'function'){
        that[i] = function(){
          var ret = that.__object[i].apply(that.__object, arguments)
          if(typeof ret === 'undefined')
            return that
          return ret
        }
      }
    }
    chainify(Object.getPrototypeOf === 'function' ? Object.getPrototypeOf(obj) : obj.__proto__, that)
    return that
  }
}

In the Java world, we call this "fluent API". Some open source projects work this way like XMLSlurper, RestAssured, Commons CSV, JOOQ, jRTF, etc.