with (mylib) {
    f1(f2(f1(), f3())); // five or 10 more lines like this
}

Bobs_Library.Bobs_Library_Function_F1(Bobs_Library.Bobs_Library_Function_F2(Bobs_Library.Bobs_Library_Function_F1(), Bobs_Library.Bobs_Library_Function_F3()));

var bkupWin = {};  // Object to store existing window properties

for(var key in myLib) {
    if(myLib.hasOwnProperty(key)){
        if(window.hasOwnProperty(key)){
          bkupWin[key] = window[key];  // Backup current property
        }
        window[key] = myLib[key];  // Add property to window
    }
}

f1(f2(f1(), f3()));

for(var key in myLib){
    if(myLib.hasOwnProperty(key)){
        delete window[key]; // Remove property from window
        if(bkupWin.hasOwnProperty(key)){
          window[key] = bkupWin[key];  // Restore old property
        }
    }
}

var
    param1 = mylib.f1(),
    param2 = mylib.f3(),
    result = mylib.f2(param1, param2);
mylib.f1(result);

mylib.f1(
      mylib.f2(
         mylib.f1(),
         mylib.f3()
      )
 );

var mylib = {
  f1: function () {
     /* do stuff */
     return this;
  },
  f2: function () {
    /* do stuff */
    return this;
  }
}

// then you can chain calls, organize with indentation
mylib
 .f1()
 .f2();

function f4() {
    return this.f1(this.f2(this.f1(), this.f3()));
}

mylib.f1(mylib.f2(mylib.f1(), mylib.f3()));

mylib.f123_facade();

for (var key in myLib) {
    if (myLib.hasOwnProperty(key)) {
        window[key] = myLib[key];
    }
}

function doWith(func, myLib) {
    for (var key in myLib) {
        if (myLib.hasOwnProperty(key)) {
            this[key] = myLib[key];
        }
    }

    func.apply(this)
}

var lib = {
    init: function(param1) {
        console.log(param1);
    },
    f2: function() {
        return "hi";
    }
};
doWith(function(){init(f2());},lib)