JS Template for making a Library that can be consumed by any system that Underscore.js supports (Browser, Node etc...)

library_template.js

// JS Library Template
// This is tooled to not clobber any namespace with the exception of temp var $$LIBDEF$$ 
// Major boilerplate was swiped from underscore.js and modified to make it more universal
// Eg: $$LIBDEF$$ = { ns: '$Q', library: 'q_lib', version: '0.1.0'}; 
//     This will load a library refereced by singleton $Q like: $Q.hiMom()
//     Change as required
$$LIBDEF$$ = { ns: '$Q', library: 'q_lib', version: '0.1.0'}; 

// Boilerplate (BP) start
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define($$LIBDEF$$.library, factory) :
    (global = global || self, (function () {

      var _ns = $$LIBDEF$$.ns, _lib = $$LIBDEF$$.library
// BP end
      // Assert dependencies
      if ( typeof $ === 'undefined' || typeof $.isXMLDoc === 'undefined') throw new Error(`jQuery is not loaded. Cannot load ${_lib}.`)
      if ( typeof _ === 'undefined' || !$.isFunction(_.reduceRight)) throw new Error(`underscore.js is not loaded. Cannot load ${_lib}.`)
      // Block duplicate loads
      if (global[_ns]) {console.log("${_lib} already loaded. Blocking reload.");return}
// BP start
      var current = global[_ns];
      var exports = global[_ns] = factory();

      exports.noConflict = function () {  global[_ns] = current; return exports; };
    }()));
  }(this, (function () {
    var _ns = $$LIBDEF$$.ns, _lib = $$LIBDEF$$.library, _ver = $$LIBDEF$$.version
// BP end
    
    // Public Functions
    function hiMom(){console.log("Hi Mom")}
  
    // Public Objects
    var SomeObj = {jsIsAwesome: true}

    // Export definition (Public functions, properties, classes ...)
    return {
        // BP start
         NS: _ns
        ,LIBRARY: _lib
        ,VERSION: _ver
        // BP end

        // Public functions
        ,hiMom: hiMom
      
        // Public objects
        ,SomeObj: SomeObj
    }
// BP start
})));delete this['$$LIBDEF$$']
// End

After figuring out how underscore.js does their namespacing and library loading, I made my own version to use as a basis for all my future JS libraries. I've only tested in Browser at the moment but the un-tested code paths are pretty much underscore.js code verbatim so it should work OOTB.