bin/lmd_builder.js
function () {
                if (this[1] && this[2][0]) {
                    var functionName = this[1][1],
                        eventName,
                        eventDescriptor;

                    switch (functionName) {
                        case "lmd_on":
                            eventName = this[2][0][1];
                            eventDescriptor = events[eventName];

                            // if no event triggers (no lmd_trigger(event_name,...))
                            // delete all lmd_on(event_name,...) statements
                            if (eventDescriptor.trigger === 0) {
                                return ["stat"]; // wipe statement = return empty statement - ;
                            }

                            // Shorten event names: Using UglifyJS AST find all event names
                            // from lmd_trigger and lmd_on and replace them with corresponding numbers
                            //console.log(this);
                            this[2][0] = ["num", eventDescriptor.eventIndex];
                            break;

                        case "lmd_trigger":
                            eventName = this[2][0][1];
                            eventDescriptor = events[eventName];

                            // if no event listeners (no lmd_on(event_name,...))
                            // replace all lmd_trigger(event_name, argument, argument)
                            // expressions with array [argument, argument]
                            if (eventDescriptor.on === 0) {
                                // if parent is statement -> return void
                                // to prevent loony arrays eg ["pewpew", "ololo"];
                                if (walker.parent()[0] === "stat") {
                                    return ["stat"]; // wipe statement = return empty statement - ;
                                }

                                /*
                                [
                                    "call",
                                    ["name", "lmd_trigger"],
                                    [
                                        ["string", "lmd-register:call-sandboxed-module"],
                                        ["name", "moduleName"],
                                        ["name", "require"]
                                    ]
                                ]

                                  --->

                                [
                                    "array",
                                    [
                                        ["name", "moduleName"],
                                        ["name", "require"]
                                    ]
                                ]
                                */
                                return ["array", this[2].slice(1)];
                            }

                            // Shorten event names: Using UglifyJS AST find all event names
                            // from lmd_trigger and lmd_on and replace them with corresponding numbers
                            this[2][0] = ["num", eventDescriptor.eventIndex];
                            break;
                    }
                }
            }
function () {
                if (this[1] && this[2][0]) {
                    var functionName = this[1][1],
                        eventName,
                        eventDescriptor;

                    switch (functionName) {
                        case "lmd_on":
                            eventName = this[2][0][1];
                            eventDescriptor = events[eventName];

                            // if no event triggers (no lmd_trigger(event_name,...))
                            // delete all lmd_on(event_name,...) statements
                            if (eventDescriptor.trigger === 0) {
                                return ["stat"]; // wipe statement = return empty statement - ;
                            }

                            // Shorten event names: Using UglifyJS AST find all event names
                            // from lmd_trigger and lmd_on and replace them with corresponding numbers
                            //console.log(this);
                            this[2][0] = ["num", eventDescriptor.eventIndex];
                            break;

                        case "lmd_trigger":
                            eventName = this[2][0][1];
                            eventDescriptor = events[eventName];

                            // if no event listeners (no lmd_on(event_name,...))
                            // replace all lmd_trigger(event_name, argument, argument)
                            // expressions with array [argument, argument]
                            if (eventDescriptor.on === 0) {
                                // if parent is statement -> return void
                                // to prevent loony arrays eg ["pewpew", "ololo"];
                                if (walker.parent()[0] === "stat") {
                                    return ["stat"]; // wipe statement = return empty statement - ;
                                }

                                /*
                                [
                                    "call",
                                    ["name", "lmd_trigger"],
                                    [
                                        ["string", "lmd-register:call-sandboxed-module"],
                                        ["name", "moduleName"],
                                        ["name", "require"]
                                    ]
                                ]

                                  --->

                                [
                                    "array",
                                    [
                                        ["name", "moduleName"],
                                        ["name", "require"]
                                    ]
                                ]
                                */
                                return ["array", this[2].slice(1)];
                            }

                            // Shorten event names: Using UglifyJS AST find all event names
                            // from lmd_trigger and lmd_on and replace them with corresponding numbers
                            this[2][0] = ["num", eventDescriptor.eventIndex];
                            break;
                    }
                }
            }
looking for first var with sandbox item;