dOne = function() {
                    console.log("editormd.methodOne");
                };

                testEditor = editormd("test-editormd", {
                    width  : "90%",
                    height : 720,
                    path   : '../lib/',
                    onload : function() {
                        this.customMethod();
                        $.proxy(EditormdExtend, this)();
                    }
                });

                editormd.methodOne();
            });
        <