$ eggroll bundle --resolve --root lib_es5/ lib_es5/index.js | uglifyjs -mceb

output.js

!function() {
    var o;
    o = function() {
        console.log("this is a cool function called fun1!");
    };
    var n;
    n = function() {
        console.log("this is a cool function called fun2!");
    };
    var c;
    c = function() {
        console.log("this is a cool function called fun3!");
    };
    var l;
    l = function() {
        console.log("this is a cool function called fun4!");
    };
    var i;
    i = function() {
        console.log("this is a cool function called fun5!");
    };
    var a;
    a = function() {
        console.log("this is a cool function called fun6!");
    };
    var f;
    f = function() {
        console.log("this is a cool function called fun7!");
    };
    var t;
    t = function() {
        console.log("this is a cool function called fun8!");
    };
    var u;
    u = function() {
        console.log("this is a cool function called fun9!");
    };
    var s;
    s = function() {
        console.log("this is a cool function called fun10!");
    };
    var e;
    e = function() {
        console.log("this is a cool function called fun11!");
    };
    var r;
    r = function() {
        console.log("this is a cool function called fun12!");
    };
    var v;
    v = function() {
        console.log("this is a cool function called fun13!");
    };
    var d;
    d = function() {
        console.log("this is a cool function called fun14!");
    };
    var g;
    g = function() {
        console.log("this is a cool function called fun15!");
    };
    var h;
    h = function() {
        console.log("this is a cool function called fun16!");
    };
    var b;
    b = function() {
        console.log("this is a cool function called fun17!");
    };
    var j;
    j = function() {
        console.log("this is a cool function called fun18!");
    };
    var k;
    k = function() {
        console.log("this is a cool function called fun19!");
    };
    var m;
    m = function() {
        console.log("this is a cool function called fun20!");
    };
    var p = o, q = n, w = c, x = l, y = i, z = a, A = f, B = t, C = u, D = s, E = e, F = r, G = v, H = d, I = g, J = h, K = b, L = j, M = k, N = m;
    p(), q(), w(), x(), y(), z(), A(), B(), C(), D(), E(), F(), G(), H(), I(), J(), 
    K(), L(), M(), N();
}();