steal/main.js

Gets JavaScript.

(function(global){

	// helpers
	var camelize = function(str){
		return str.replace(/-+(.)?/g, function(match, chr){
			return chr ? chr.toUpperCase() : ''
		});
	},
		each = function( o, cb){
			var i, len;

			// weak array detection, but we only use this internally so don't
			// pass it weird stuff
			if ( typeof o.length == 'number' && (o.length - 1) in o) {
				for ( i = 0, len = o.length; i < len; i++ ) {
					cb.call(o[i], o[i], i, o);
				}
			} else {
				for ( i in o ) {
					if(o.hasOwnProperty(i)){
						cb.call(o[i], o[i], i, o);
					}
				}
			}
			return o;
		},
		map = function(o, cb) {
			var arr = [];
			each(o, function(item, i){
				arr[i] = cb(item, i);
			});
			return arr;
		},
		isString = function(o) {
			return typeof o == "string";
		},
		extend = function(d,s){
			each(s, function(v, p){
				d[p] = v;
			});
			return d;
		},
		dir = function(uri){
			var lastSlash = uri.lastIndexOf("/");
			//if no / slashes, check for \ slashes since it might be a windows path
			if(lastSlash === -1)
				lastSlash = uri.lastIndexOf("\\");
			if(lastSlash !== -1) {
				return uri.substr(0, lastSlash);
			} else {
				return uri;
			}
		},
		last = function(arr){
			return arr[arr.length - 1];
		},
		parseURI = function(url) {
			var m = String(url).replace(/^\s+|\s+$/g, '').match(/^([^:\/?#]+:)?(\/\/(?:[^:@\/]*(?::[^:@\/]*)?@)?(([^:\/?#]*)(?::(\d*))?))?([^?#]*)(\?[^#]*)?(#[\s\S]*)?/);
				// authority = '//' + user + ':' + pass '@' + hostname + ':' port
				return (m ? {
				href     : m[0] || '',
				protocol : m[1] || '',
				authority: m[2] || '',
				host     : m[3] || '',
				hostname : m[4] || '',
				port     : m[5] || '',
				pathname : m[6] || '',
				search   : m[7] || '',
				hash     : m[8] || ''
			} : null);
		},
		joinURIs = function(base, href) {
			function removeDotSegments(input) {
				var output = [];
				input.replace(/^(\.\.?(\/|$))+/, '')
					.replace(/\/(\.(\/|$))+/g, '/')
					.replace(/\/\.\.$/, '/../')
					.replace(/\/?[^\/]*/g, function (p) {
						if (p === '/..') {
							output.pop();
						} else {
							output.push(p);
						}
					});
				return output.join('').replace(/^\//, input.charAt(0) === '/' ? '/' : '');
			}

			href = parseURI(href || '');
			base = parseURI(base || '');

			return !href || !base ? null : (href.protocol || base.protocol) +
				(href.protocol || href.authority ? href.authority : base.authority) +
				removeDotSegments(href.protocol || href.authority || href.pathname.charAt(0) === '/' ? href.pathname : (href.pathname ? ((base.authority && !base.pathname ? '/' : '') + base.pathname.slice(0, base.pathname.lastIndexOf('/') + 1) + href.pathname) : base.pathname)) +
					(href.protocol || href.authority || href.pathname ? href.search : (href.search || base.search)) +
					href.hash;
		},
		relativeURI = function(base, path) {
			var uriParts = path.split("/"),
				baseParts = base.split("/"),
				result = [];
			while ( uriParts.length && baseParts.length && uriParts[0] == baseParts[0] ) {
				uriParts.shift();
				baseParts.shift();
			}
			for(var i = 0 ; i< baseParts.length-1; i++) {
				result.push("../");
			}
			return "./" + result.join("") + uriParts.join("/");
		},
		fBind = Function.prototype.bind,
		isFunction = function(obj) {
			return !!(obj && obj.constructor && obj.call && obj.apply);
		},
		isWebWorker = typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope,
		isNode = typeof process === "object" && {}.toString.call(process) === "[object process]",
		isBrowserWithWindow = !isNode && typeof window !== "undefined",
		isNW = isNode && (function(){
			try {
				return require("nw.gui") !== "undefined";
			} catch(e) {
				return false;
			}
		})(),
		isElectron = isNode && !!process.versions["electron"],
		isNode = isNode && !isNW && !isElectron,
		hasAWindow = isBrowserWithWindow || isNW || isElectron,
		getStealScript = function(){
			if(isBrowserWithWindow || isNW || isElectron) {
				if(document.currentScript) {
					return document.currentScript;
				}
				var scripts = document.scripts;

				if (scripts.length) {
					var currentScript = scripts[scripts.length - 1];
					return currentScript;
				}
			}
		},
		stealScript = getStealScript(),
		warn = typeof console === "object" ?
			fBind.call(console.warn, console) : function(){};

	var filename = function(uri){
		var lastSlash = uri.lastIndexOf("/");
		//if no / slashes, check for \ slashes since it might be a windows path
		if(lastSlash === -1)
			lastSlash = uri.lastIndexOf("\\");
		var matches = ( lastSlash == -1 ? uri : uri.substr(lastSlash+1) ).match(/^[\w-\s\.!]+/);
		return matches ? matches[0] : "";
	};

	var ext = function(uri){
		var fn = filename(uri);
		var dot = fn.lastIndexOf(".");
		if(dot !== -1) {
			return fn.substr(dot+1);
		} else {
			return "";
		}
	};

	var pluginCache = {};

	var normalize = function(unnormalizedName, loader){
		var name = unnormalizedName;

		// Detech if this name contains a plugin part like: app.less!steal/less
		// and catch the plugin name so that when it is normalized we do not perform
		// Steal's normalization against it.
		var pluginIndex = name.lastIndexOf('!');
		var pluginPart = "";
		if (pluginIndex != -1) {
			// argumentName is the part before the !
			var argumentName = name.substr(0, pluginIndex);
			var pluginName = name.substr(pluginIndex + 1);
			pluginPart = "!" + pluginName;

			// Set the name to the argument name so that we can normalize it alone.
			name = argumentName;
		}

		var last = filename(name),
			extension = ext(name);
		// if the name ends with /
		if(	name[name.length -1] === "/" ) {
			return name+filename( name.substr(0, name.length-1) ) + pluginPart;
		} else if(	!/^(\w+(?:s)?:\/\/|\.|file|\/)/.test(name) &&
			// and doesn't end with a dot
			 last.indexOf(".") === -1
			) {
			return name+"/"+last + pluginPart;
		} else {
			if(extension === "js") {
				return name.substr(0, name.lastIndexOf(".")) + pluginPart;
			} else {
				return name + pluginPart;
			}
		}
	};

var cloneSteal = function(System){
	var loader = System || this.System;
	var steal = makeSteal(loader.clone());
	steal.loader.set("@steal", steal.loader.newModule({
		"default": steal,
		__useDefault: true
	}));
	steal.clone = cloneSteal;
	return steal;
};



var ArraySet;
if(typeof Set === "function") {
	ArraySet = Set;
} else {
	ArraySet = function(){ this._items = []; };
	ArraySet.prototype.has = function(item) {
		return this._items.indexOf(item) !== -1;
	};
	ArraySet.prototype.add = function(item) {
		if(!this.has(item)) {
			this._items.push(item);
		}
	};
}

var makeSteal = function(System){
	var addStealExtension = function (extensionFn) {
		if (typeof System !== "undefined" && isFunction(extensionFn)) {
			if (System._extensions) {
				System._extensions.push(extensionFn);
			}
			extensionFn(System, steal);
		}
	};

	System.set('@loader', System.newModule({
		'default': System,
		__useDefault: true
	}));


	System.set("less", System.newModule({
		__useDefault: true,
		default: {
			fetch: function() {
				throw new Error(
					[
						"steal-less plugin must be installed and configured properly",
						"See https://stealjs.com/docs/steal-less.html"
					].join("\n")
				);
			}
		}
	}));

	System.config({
		map: {
			"@loader/@loader": "@loader",
			"@steal/@steal": "@steal"
		}
	});

	var configPromise,
		devPromise,
		appPromise;

	var steal = function(){
		var args = arguments;
		var afterConfig = function(){
			var imports = [];
			var factory;
			each(args, function(arg){
				if(isString(arg)) {
					imports.push( steal.System['import']( normalize(arg) ) );
				} else if(typeof arg === "function") {
					factory = arg;
				}
			});

			var modules = Promise.all(imports);
			if(factory) {
				return modules.then(function(modules) {
			        return factory && factory.apply(null, modules);
			   });
			} else {
				return modules;
			}
		};
		if(System.isEnv("production")) {
			return afterConfig();
		} else {
			// wait until the config has loaded
			return configPromise.then(afterConfig,afterConfig);
		}

	};

	System.set("@steal", System.newModule({
		"default": steal,
		__useDefault:true
	}));
	System.Set = ArraySet;

	var loaderClone = System.clone;
	System.clone = function(){
		var loader = loaderClone.apply(this, arguments);
		loader.set("@loader", loader.newModule({
			"default": loader,
			__useDefault: true
		}));
		loader.set("@steal", loader.newModule({
			"default": steal,
			__useDefault: true
		}));
		loader.Set = ArraySet;
		return loader;
	};



	// steal.System remains for backwards compat only
	steal.System = steal.loader = System;
	steal.parseURI = parseURI;
	steal.joinURIs = joinURIs;
	steal.normalize = normalize;
	steal.relativeURI = relativeURI;
	steal.addExtension = addStealExtension;

// System-Ext
// This normalize-hook does 2 things.
// 1. with specify a extension in your config
// 		you can use the "!" (bang) operator to load
// 		that file with the extension
// 		System.ext = {bar: "path/to/bar"}
// 		foo.bar! -> foo.bar!path/to/bar
// 2. if you load a javascript file e.g. require("./foo.js")
// 		normalize will remove the ".js" to load the module
addStealExtension(function addExt(loader) {
  loader.ext = {};

  var normalize = loader.normalize,
    endingExtension = /\.(\w+)!?$/;

  loader.normalize = function (name, parentName, parentAddress, pluginNormalize) {
    if (pluginNormalize) {
      return normalize.apply(this, arguments);
    }

    var matches = name.match(endingExtension);
	var outName = name;

    if (matches) {
      var hasBang = name[name.length - 1] === "!",
        ext = matches[1];
      // load js-files nodd-like
      if (parentName && loader.configMain !== name && matches[0] === '.js') {
        outName = name.substr(0, name.lastIndexOf("."));
        // matches ext mapping
      } else if (loader.ext[ext]) {
        outName = name + (hasBang ? "" : "!") + loader.ext[ext];
      }
    }
    return normalize.call(this, outName, parentName, parentAddress);
  };
});

// Steal Locate Extension
// normalize a given path e.g.
// "path/to/folder/" -> "path/to/folder/folder"
addStealExtension(function addForwardSlash(loader) {
  var normalize = loader.normalize;
  var npmLike = /@.+#.+/;

  loader.normalize = function (name, parentName, parentAddress, pluginNormalize) {
    var lastPos = name.length - 1,
      secondToLast,
      folderName,
	  newName = name;

    if (name[lastPos] === "/") {
      secondToLast = name.substring(0, lastPos).lastIndexOf("/");
      folderName = name.substring(secondToLast + 1, lastPos);
      if (npmLike.test(folderName)) {
        folderName = folderName.substr(folderName.lastIndexOf("#") + 1);
      }

      newName += folderName;
    }
    return normalize.call(this, newName, parentName, parentAddress, pluginNormalize);
  };
});

// override loader.translate to rewrite 'locate://' & 'pkg://' path schemes found
// in resources loaded by supporting plugins
addStealExtension(function addLocateProtocol(loader) {
  /**
   * @hide
   * @function normalizeAndLocate
   * @description Run a module identifier through Normalize and Locate hooks.
   * @param {String} moduleName The module to run through normalize and locate.
   * @return {Promise} A promise to resolve when the address is found.
   */
  var normalizeAndLocate = function(moduleName, parentName){
    var loader = this;
    return Promise.resolve(loader.normalize(moduleName, parentName))
      .then(function(name){
        return loader.locate({name: name, metadata: {}});
      }).then(function(address){
		var outAddress = address;
        if(address.substr(address.length - 3) === ".js") {
          outAddress = address.substr(0, address.length - 3);
        }
        return outAddress;
      });
  };

  var relative = function(base, path){
    var uriParts = path.split("/"),
      baseParts = base.split("/"),
      result = [];

    while ( uriParts.length && baseParts.length && uriParts[0] == baseParts[0] ) {
      uriParts.shift();
      baseParts.shift();
    }

    for(var i = 0 ; i< baseParts.length-1; i++) {
      result.push("../");
    }

    return result.join("") + uriParts.join("/");
  };

  var schemePattern = /(locate):\/\/([a-z0-9/._@-]*)/ig,
    parsePathSchemes = function(source, parent) {
      var locations = [];
      source.replace(schemePattern, function(whole, scheme, path, index){
        locations.push({
          start: index,
          end: index+whole.length,
          name: path,
          postLocate: function(address){
            return relative(parent, address);
          }
        });
      });
      return locations;
    };

  var _translate = loader.translate;
  loader.translate = function(load){
    var loader = this;

    // This only applies to plugin resources.
    if(!load.metadata.plugin) {
      return _translate.call(this, load);
    }

    // Use the translator if this file path scheme is supported by the plugin
    var locateSupport = load.metadata.plugin.locateScheme;
    if(!locateSupport) {
      return _translate.call(this, load);
    }

    // Parse array of module names
    var locations = parsePathSchemes(load.source, load.address);

    // no locations found
    if(!locations.length) {
      return _translate.call(this, load);
    }

    // normalize and locate all of the modules found and then replace those instances in the source.
    var promises = [];
    for(var i = 0, len = locations.length; i < len; i++) {
      promises.push(
        normalizeAndLocate.call(this, locations[i].name, load.name)
      );
    }
    return Promise.all(promises).then(function(addresses){
      for(var i = locations.length - 1; i >= 0; i--) {
        load.source = load.source.substr(0, locations[i].start)
          + locations[i].postLocate(addresses[i])
          + load.source.substr(locations[i].end, load.source.length);
      }
      return _translate.call(loader, load);
    });
  };
});

addStealExtension(function addContextual(loader) {
  loader._contextualModules = {};

  loader.setContextual = function(moduleName, definer){
    this._contextualModules[moduleName] = definer;
  };

  var normalize = loader.normalize;
  loader.normalize = function(name, parentName){
    var loader = this;
	var pluginLoader = loader.pluginLoader || loader;

    if (parentName) {
      var definer = this._contextualModules[name];

      // See if `name` is a contextual module
      if (definer) {
        var localName = name + '/' + parentName;

        if(!loader.has(localName)) {
          // `definer` could be a function or could be a moduleName
          if (typeof definer === 'string') {
            definer = pluginLoader['import'](definer);
          }

          return Promise.resolve(definer)
            .then(function(modDefiner) {
				var definer = modDefiner;
              if (definer['default']) {
                definer = definer['default'];
              }
              var definePromise = Promise.resolve(
                definer.call(loader, parentName)
              );
              return definePromise;
            })
            .then(function(moduleDef){
              loader.set(localName, loader.newModule(moduleDef));
              return localName;
            });
        }
        return Promise.resolve(localName);
      }
    }

    return normalize.apply(this, arguments);
  };
});

/**
 * Steal Script-Module Extension
 *
 * Add a steal-module script to the page and it will run after Steal has been
 * configured, e.g:
 *
 * <script type="text/steal-module">...</script>
 * <script type="steal-module">...</script>
 */
addStealExtension(function addStealModule(loader) {
	// taken from https://github.com/ModuleLoader/es6-module-loader/blob/master/src/module-tag.js
	function completed() {
		document.removeEventListener("DOMContentLoaded", completed, false);
		window.removeEventListener("load", completed, false);
		ready();
	}

	function ready() {
		var scripts = document.getElementsByTagName("script");
		for (var i = 0; i < scripts.length; i++) {
			var script = scripts[i];
			if (script.type == "steal-module" || script.type == "text/steal-module") {
				var source = script.innerHTML;
				if (/\S/.test(source)) {
					loader.module(source)["catch"](function(err) {
						setTimeout(function() {
							throw err;
						});
					});
				}
			}
		}
	}

	loader.loadScriptModules = function() {
		if (isBrowserWithWindow) {
			if (document.readyState === "complete") {
				setTimeout(ready);
			} else if (document.addEventListener) {
				document.addEventListener("DOMContentLoaded", completed, false);
				window.addEventListener("load", completed, false);
			}
		}
	};
});

// SystemJS Steal Format
// Provides the Steal module format definition.
addStealExtension(function addStealFormat(loader) {
  // Steal Module Format Detection RegEx
  // steal(module, ...)
  var stealRegEx = /(?:^\s*|[}{\(\);,\n\?\&]\s*)steal\s*\(\s*((?:"[^"]+"\s*,|'[^']+'\s*,\s*)*)/;

  // What we stole.
  var stealInstantiateResult;

  function createSteal(loader) {
    stealInstantiateResult = null;

    // ensure no NodeJS environment detection
    loader.global.module = undefined;
    loader.global.exports = undefined;

    function steal() {
      var deps = [];
      var factory;

      for( var i = 0; i < arguments.length; i++ ) {
        if (typeof arguments[i] === 'string') {
          deps.push( normalize(arguments[i]) );
        } else {
          factory = arguments[i];
        }
      }

      if (typeof factory !== 'function') {
        factory = (function(factory) {
          return function() { return factory; };
        })(factory);
      }

      stealInstantiateResult = {
        deps: deps,
        execute: function(require, exports, moduleName) {

          var depValues = [];
          for (var i = 0; i < deps.length; i++) {
            depValues.push(require(deps[i]));
          }

          var output = factory.apply(loader.global, depValues);

          if (typeof output !== 'undefined') {
            return output;
          }
        }
      };
    }

    loader.global.steal = steal;
  }

  var loaderInstantiate = loader.instantiate;
  loader.instantiate = function(load) {
    var loader = this;

    if (load.metadata.format === 'steal' || !load.metadata.format && load.source.match(stealRegEx)) {
      load.metadata.format = 'steal';

      var oldSteal = loader.global.steal;

      createSteal(loader);

      loader.__exec(load);

      loader.global.steal = oldSteal;

      if (!stealInstantiateResult) {
        throw "Steal module " + load.name + " did not call steal";
      }

      if (stealInstantiateResult) {
        load.metadata.deps = load.metadata.deps ? load.metadata.deps.concat(stealInstantiateResult.deps) : stealInstantiateResult.deps;
        load.metadata.execute = stealInstantiateResult.execute;
      }
    }
    return loaderInstantiate.call(loader, load);
  };
});

addStealExtension(function addMetaDeps(loader) {
	var superTranspile = loader.transpile;
	var superDetermineFormat = loader._determineFormat;

	function prependDeps (loader, load, callback) {
		var meta = loader.meta[load.name];
		if (meta && meta.deps && meta.deps.length) {
			var imports = meta.deps.map(callback).join('\n');
			load.source = imports + "\n" + load.source;
		}
	}

	function createImport(dep) {
		return "import \"" + dep + "\";";
	}

	function createRequire(dep) {
		return "require(\"" + dep + "\");";
	}

	loader.transpile = function (load) {
		prependDeps(this, load, createImport);
		var result = superTranspile.apply(this, arguments);
		return result;
	}

	loader._determineFormat = function (load) {
		if(load.metadata.format === 'cjs') {
			prependDeps(this, load, createRequire);
		}
		var result = superDetermineFormat.apply(this, arguments);
		return result;
	};
});

addStealExtension(function addStackTrace(loader) {
	function StackTrace(message, items) {
		this.message = message;
		this.items = items;
	}

	StackTrace.prototype.toString = function(){
		var arr = ["Error: " + this.message];
		var t, desc;
		for(var i = 0, len = this.items.length; i < len; i++) {
			t = this.items[i];
			desc = "    at ";
			if(t.fnName) {
				desc += (t.fnName + " ");
			}
			desc += StackTrace.positionLink(t);
			arr.push(desc);
		}
		return arr.join("\n");
	};

	StackTrace.positionLink = function(t){
		var line = t.line || 0;
		var col = t.column || 0;
		return "(" + t.url + ":" + line + ":" + col + ")";
	};

	StackTrace.item = function(fnName, url, line, column) {
		return {
			method: fnName,
			fnName: fnName,
			url: url,
			line: line,
			column: column
		}
	};

	function parse(stack) {
	  var rawLines = stack.split('\n');

	  var v8Lines = compact(rawLines.map(parseV8Line));
	  if (v8Lines.length > 0) return v8Lines;

	  var geckoLines = compact(rawLines.map(parseGeckoLine));
	  if (geckoLines.length > 0) return geckoLines;

	  throw new Error('Unknown stack format: ' + stack);
	}

	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/Stack
	var GECKO_LINE = /^(?:([^@]*)@)?(.*?):(\d+)(?::(\d+))?$/;

	function parseGeckoLine(line) {
	  var match = line.match(GECKO_LINE);
	  if (!match) return null;
	  var meth = match[1] || ''
	  return {
	    method:   meth,
		fnName:   meth,
	    url: match[2] || '',
	    line:     parseInt(match[3]) || 0,
	    column:   parseInt(match[4]) || 0,
	  };
	}

	// https://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
	var V8_OUTER1 = /^\s*(eval )?at (.*) \((.*)\)$/;
	var V8_OUTER2 = /^\s*at()() (\S+)$/;
	var V8_INNER  = /^\(?([^\(]+):(\d+):(\d+)\)?$/;

	function parseV8Line(line) {
	  var outer = line.match(V8_OUTER1) || line.match(V8_OUTER2);
	  if (!outer) return null;
	  var inner = outer[3].match(V8_INNER);
	  if (!inner) return null;

	  var method = outer[2] || '';
	  if (outer[1]) method = 'eval at ' + method;
	  return {
	    method:   method,
		fnName:   method,
	    url: inner[1] || '',
	    line:     parseInt(inner[2]) || 0,
	    column:   parseInt(inner[3]) || 0,
	  };
	}

	// Helpers

	function compact(array) {
	  var result = [];
	  array.forEach(function(value) {
	    if (value) {
	      result.push(value);
	    }
	  });
	  return result;
	}

	StackTrace.parse = function(error) {
		try {
			var lines = parse(error.stack || error);
			if(lines.length) {
				return new StackTrace(error.message, lines);
			}
		} catch(e) {
			return undefined;
		}

	};

	loader.StackTrace = StackTrace;

	function getPositionOfError(txt) {
		var res = /at position ([0-9]+)/.exec(txt);
		if(res && res.length > 1) {
			return Number(res[1]);
		}
	}

	loader.loadCodeFrame = function(){
		if(!this.global.process) {
			this.global.process = { argv: '', env: {} };
		}

		var loader = this.pluginLoader || this;
		var isProd = loader.isEnv("production");
		var p = isProd ? Promise.resolve() : loader["import"]("@@babel-code-frame");
		return p;
	};

	loader._parseJSONError = function(err, source){
		var pos = getPositionOfError(err.message);
		if(pos) {
			return this._getLineAndColumnFromPosition(source, pos);
		} else {
			return {line: 0, column: 0};
		}
	};

	var errPos = /at position( |:)([0-9]+)/;
	var errLine = /at line ([0-9]+) column ([0-9]+)/;
	loader._parseSyntaxErrorLocation = function(error, load){
		// V8 and Edge
		var res = errPos.exec(error.message);
		if(res && res.length === 3) {
			var pos = Number(res[2]);
			return this._getLineAndColumnFromPosition(load.source, pos);
		}

		// Firefox
		res = errLine.exec(error.message);
		if(res && res.length === 3) {
			return {
				line: Number(res[1]),
				column: Number(res[2])
			};
		}
	}

	loader._addSourceInfoToError = function(err, pos, load, fnName){
		return this.loadCodeFrame()
		.then(function(codeFrame){
			if(codeFrame) {
				var src = load.metadata.originalSource || load.source;
				var codeSample = codeFrame(src, pos.line, pos.column);
				err.message += "\n\n" + codeSample + "\n";
			}
			var stackTrace = new StackTrace(err.message, [
				StackTrace.item(fnName, load.address, pos.line, pos.column)
			]);
			err.stack = stackTrace.toString();
			return Promise.reject(err);
		});
	};

	function findStackFromAddress(st, address) {
		for(var i = 0; i < st.items.length; i++) {
			if(st.items[i].url === address) {
				return st.items[i];
			}
		}
	}

	loader.rejectWithCodeFrame = function(error, load) {
		var st = StackTrace.parse(error);

		var item;
		if(error.onlyIncludeCodeFrameIfRootModule) {
			item = st && st.items[0] && st.items[0].url === load.address && st.items[0];
		} else {
			item = findStackFromAddress(st, load.address);
		}

		if(item) {
			return this.loadCodeFrame()
			.then(function(codeFrame){
				if(codeFrame) {
					var newError = new Error(error.message);

					var line = item.line;
					var column = item.column;

					// CommonJS adds 3 function wrappers
					if(load.metadata.format === "cjs") {
						line = line - 3;
					}

					var src = load.metadata.originalSource || load.source;
					var codeSample = codeFrame(src, line, column);
					if(!codeSample) return Promise.reject(error);

					newError.message += "\n\n" + codeSample + "\n";
					st.message = newError.message;
					newError.stack = st.toString();
					return Promise.reject(newError);
				} else {
					return Promise.reject(error);
				}
			});
		}

		return Promise.reject(error);
	};
});

addStealExtension(function addPrettyName(loader){
	loader.prettyName = function(load){
		var pnm = load.metadata.parsedModuleName;
		if(pnm) {
			return pnm.packageName + "/" + pnm.modulePath;
		}
		return load.name;
	};
});

addStealExtension(function addTreeShaking(loader) {
	function treeShakingEnabled(loader, load) {
		return !loader.noTreeShaking && loader.treeShaking !== false;
	}

	function determineUsedExports(load) {
		var loader = this;

		// 1. Get any new dependencies that haven't been accounted for.
		var newDeps = newDependants.call(this, load);
		var usedExports = new loader.Set();
		var allUsed = false;
		newDeps.forEach(function(depName) {
			var depLoad = loader.getModuleLoad(depName);
			var specifier = loader.moduleSpecifierFromName(depLoad, load.name);
			if (depLoad.metadata.format !== "es6") {
				allUsed = true;
				return;
			}
		});

		// Only walk the export tree if all are not being used.
		// This saves not needing to do the traversal.
		if(!allUsed) {
			allUsed = walkExports.call(loader, load, function(exps){
				exps.forEach(function(name){
					usedExports.add(name);
				});
			});
		}

		// Copy over existing exports
		if(load.metadata.usedExports) {
			load.metadata.usedExports.forEach(function(name){
				usedExports.add(name);
			});
		}

		if(!loader.treeShakeConfig[load.name]) {
			loader.treeShakeConfig[load.name] = Object.create(null);
		}

		load.metadata.usedExports = loader.treeShakeConfig[load.name].usedExports = usedExports;
		load.metadata.allExportsUsed = loader.treeShakeConfig[load.name].allExportsUsed = allUsed;

		return {
			all: allUsed,
			used: usedExports
		};
	}

	// Determine if this load's dependants have changed,
	function newDependants(load) {
		var out = [];
		var deps = this.getDependants(load.name);
		var shakenParents = load.metadata.shakenParents;
		if (!shakenParents) {
			out = deps;
		} else {
			for (var i = 0; i < deps.length; i++) {
				if (shakenParents.indexOf(deps[i]) === -1) {
					out.push(deps[i]);
				}
			}
		}
		return out;
	}

	function walkExports(load, cb) {
		var moduleName = load.name;
		var name = moduleName;
		var visited = new this.Set();

 		// The stack is an array containing stuff we are traversing.
		// It looks like:
		// [moduleName, parentA, parentB, null]
		var stack = [name].concat(this.getDependants(name));
		var namesMap = null;
		var index = 0;
		var cont = true;

		// If there is only one item in the stack, this module has no parents yet.
		if(stack.length === 1) {
			return true;
		}

		// Special case for immediate parents, as these are the ones
		// That determine when all exports are used.
		var immediateParents = Object.create(null);
		stack.forEach(function(name) {
			immediateParents[name] = true;
		});

		do {
			index++;
			var parentName = stack[index];

			if(parentName == null) {
				name = stack[++index];
				cont = index < stack.length - 1;
				continue;
			}

			if(visited.has(parentName)) {
				continue;
			}

			visited.add(parentName);
			var parentLoad = this.getModuleLoad(parentName);
			var parentSpecifier = this.moduleSpecifierFromName(
				parentLoad,
				name
			);

			var parentIsESModule = parentLoad.metadata.format === "es6";
			var parentImportNames = parentLoad.metadata.importNames;
			var parentExportNames = parentLoad.metadata.exportNames;

			// If this isn't an ES module then return true (indicating all are used)
			if(!parentIsESModule && immediateParents[parentName]) {
				return true;
			}

			if(parentImportNames && parentImportNames[parentSpecifier]) {
				var names = parentImportNames[parentSpecifier];
				if(namesMap) {
					var parentsNames = names;
					names = [];
					parentsNames.forEach(function(name){
						if(namesMap.has(name)) {
							names.push(namesMap.get(name));
						}
					});
				}


				cont = cb(names) !== false;
			}

			if(parentExportNames && parentExportNames[parentSpecifier]) {
				var names = parentExportNames[parentSpecifier];
				var parentDependants = this.getDependants(parentName);
				// Named exports
				if(isNaN(names)) {
					namesMap = names;
				}
				// export * with no dependants should result in no tree-shaking
				else if(!parentDependants.length) {
					return true;
				}

				stack.push(null);
				stack.push(parentName);
				stack.push.apply(stack, parentDependants);
			}

			cont = cont !== false && index < stack.length - 1;
		} while(cont);

		return false;
	}

	/**
	 * Determine if the new parent has resulted in new used export names
	 * If so, redefine this module so that it goes into the registry correctly.
	 */
	function reexecuteIfNecessary(load, parentName) {
		var usedExports = [];
		var allExportsUsed = walkExports.call(this, load, function(exps) {
			usedExports.push.apply(usedExports, exps);
		});

		// Given the parent's used exports, loop over and see if any are not
		// within the usedExports set.
		var hasNewExports = allExportsUsed;

		// If there isn't a usedExports Set, we have yet to check.
		if(!allExportsUsed && load.metadata.usedExports) {
			for (var i = 0; i < usedExports.length; i++) {
				if (!load.metadata.usedExports.has(usedExports[i])) {
					hasNewExports = true;
					break;
				}
			}
		}

		if (hasNewExports) {
			var source = load.metadata.originalSource || load.source;
			this.provide(load.name, source, load);
		}

		return Promise.resolve();
	}

	// Check if a module has already been tree-shaken.
	// And if so, re-execute it if there are new dependant modules.
	var notifyLoad = loader.notifyLoad;
	loader.notifyLoad = function(specifier, name, parentName){
		var load = loader.getModuleLoad(name);

		// If this module is already marked as tree-shakable it means
		// it has been loaded before. Determine if it needs to be reexecuted.
		if (load && load.metadata.treeShakable) {
			return reexecuteIfNecessary.call(this, load, parentName);
		}
		return notifyLoad.apply(this, arguments);
	};

	function treeShakePlugin(loader, load) {
		// existence of this type of Node means the module is not tree-shakable
		var notShakable = {
			exit: function(path, state) {
				state.treeShakable = false;
			}
		};

		// "bare" imports like `import "foo";` do not affect tree-shaking
		// any non-"bare" import means module cannot be tree-shaken
		var checkImportForShakability = {
			exit: function(path, state) {
				state.treeShakable = path.node.specifiers.length === 0;
			}
		};

		var notShakeableVisitors = {
			ImportDeclaration: checkImportForShakability,
			FunctionDeclaration: notShakable,
			VariableDeclaration: notShakable
		};

		var usedResult;
		// Call determineUsedExports, caching the result.
		function _determineUsedExports() {
			if(usedResult) {
				return usedResult;
			}
			usedResult = determineUsedExports.call(
				loader,
				load
			);
			return usedResult;
		}

		return {
			visitor: {
				Program: {
					enter: function(path) {
						var state = {};
						path.traverse(notShakeableVisitors, state);

						load.metadata.treeShakable = state.treeShakable !== false;
						if(!loader.treeShakeConfig[load.name]) {
							loader.treeShakeConfig[load.name] = Object.create(null);
						}
						loader.treeShakeConfig[load.name].treeShakable = load.metadata.treeShakable;
					}
				},

				ExportNamedDeclaration: function(path, state) {
					if (load.metadata.treeShakable) {
						var usedResult = _determineUsedExports();
						var usedExports = usedResult.used;
						var allUsed = usedResult.all;

						if (!allUsed) {
							path.get("specifiers").forEach(function(path) {
								var name = path.get("exported.name").node;
								if (
									!usedExports.has(name) &&
									name !== "__esModule"
								) {
									path.remove();
								}
							});

							if (path.get("specifiers").length === 0) {
								path.remove();
							}
						}
					}
				},

				ExportAllDeclaration: function(path, state) {
					if(load.metadata.treeShakable) {
						// This forces the load.metadata.usedExports property to be set
						// This is needed in modules that *only* have `export *` declarations.
						_determineUsedExports();
					}
				}
			}
		};
	}

	// Collect syntax plugins, because we need to always include these.
	var getSyntaxPlugins = (function(){
		var plugins;
		return function(babel) {
			if(!plugins) {
				plugins = [];
				for(var p in babel.availablePlugins) {
					if(p.indexOf("syntax-") === 0) {
						plugins.push(babel.availablePlugins[p]);
					}
				}
			}
			return plugins;
		};
	})();




	function applyBabelPlugin(load) {
		var loader = this;
		var pluginLoader = loader.pluginLoader || loader;

		return pluginLoader.import("babel").then(function(mod) {
			var transpiler = mod.__useDefault ? mod.default : mod;
			var babel = transpiler.Babel || transpiler.babel || transpiler;

			try {
				var babelPlugins = [].concat(getSyntaxPlugins(babel));
				babelPlugins.push(loader._getImportSpecifierPositionsPlugin.bind(null, load));
				if(treeShakingEnabled(loader, load)) {
					babelPlugins.push(treeShakePlugin.bind(null, loader, load));
				}
				var code = babel.transform(load.source, {
					plugins: babelPlugins,
					compact: false,
					filename: load && load.address
				}).code;

				// If everything is tree shaken still mark as ES6
				// Not doing this and steal won't accept the transform.
				if(code === "") {
					return '"format es6";';
				}

				return code;
			} catch (e) {
				// Probably using some syntax that requires additional plugins.
				if(e instanceof SyntaxError) {
					return Promise.resolve();
				}
				return Promise.reject(e);
			}
		});
	}

	var translate = loader.translate;
	var es6RegEx = /(^\s*|[}\);\n]\s*)(import\s+(['"]|(\*\s+as\s+)?[^"'\(\)\n;]+\s+from\s+['"]|\{)|export\s+\*\s+from\s+["']|export\s+(\{|default|function|class|var|const|let|async\s+function))/;
	loader.translate = function treeshakeTranslate(load) {
		var loader = this;
		return Promise.resolve()
			.then(function() {
				if (es6RegEx.test(load.source)) {
					if(!load.metadata.originalSource)
						load.metadata.originalSource = load.source;
					return applyBabelPlugin.call(loader, load);
				}
			})
			.then(function(source) {
				if (source) {
					load.source = source;
				}
				return translate.call(loader, load);
			});
	};

	// For the build, wrap the _newLoader hook. This is to copy config over
	// that needs to exist for all loaders.
	loader.treeShakeConfig = Object.create(null);
	var newLoader = loader._newLoader || Function.prototype;
	loader._newLoader = function(loader){
		var treeShakeConfig = this.treeShakeConfig;
		loader.treeShakeConfig = this.treeShakeConfig;

		for(var moduleName in treeShakeConfig) {
			var moduleTreeShakeConfig = treeShakeConfig[moduleName];

			var metaConfig = Object.create(null);
			metaConfig.treeShakable = moduleTreeShakeConfig.treeShakable;
			metaConfig.usedExports = new this.Set(moduleTreeShakeConfig.usedExports);
			metaConfig.allExportsUsed = moduleTreeShakeConfig.allExportsUsed;

			var config = {meta:{}};
			config.meta[moduleName] = metaConfig;
			loader.config(config);
		}
	};
});

addStealExtension(function addMJS(loader){
	var mjsExp = /\.mjs$/;
	var jsExp = /\.js$/;

	var locate = loader.locate;
	loader.locate = function(load){
		var isMJS = mjsExp.test(load.name);
		var p = locate.apply(this, arguments);

		if(isMJS) {
			return Promise.resolve(p).then(function(address) {
				if(jsExp.test(address)) {
					return address.substr(0, address.length - 3);
				}
				return address;
			});
		}

		return p;
	};
});

addStealExtension(function applyTraceExtension(loader) {
	loader._traceData = {
		loads: {},
		parentMap: {}
	};

	loader.getDependencies = function(moduleName){
		var load = this.getModuleLoad(moduleName);
		return load ? load.metadata.dependencies : undefined;
	};
	loader.getDependants = function(moduleName){
		var deps = [];
		var pars = this._traceData.parentMap[moduleName] || {};
		eachOf(pars, function(name) { deps.push(name); });
		return deps;
	};
	loader.getModuleLoad = function(moduleName){
		return this._traceData.loads[moduleName];
	};
	loader.getBundles = function(moduleName, argVisited){
		var visited = argVisited || {};
		visited[moduleName] = true;
		var loader = this;
		var parentMap = loader._traceData.parentMap;
		var parents = parentMap[moduleName];
		if(!parents) return [moduleName];

		var bundles = [];
		eachOf(parents, function(parentName, value){
			if(!visited[parentName])
				bundles = bundles.concat(loader.getBundles(parentName, visited));
		});
		return bundles;
	};
	loader.getImportSpecifier = function(fullModuleName, load){
		var idx = 0, specifier;
		while(idx < load.metadata.dependencies.length) {
			if(load.metadata.dependencies[idx] === fullModuleName) {
				specifier = load.metadata.deps[idx];
				break;
			}
			idx++;
		}
		if(specifier) {
			if(load.metadata.importSpecifiers) {
				return (load.metadata.importSpecifiers[specifier] || {}).start;
			} else if(load.metadata.getImportPosition) {
				return load.metadata.getImportPosition(specifier);
			}
		}
	};
	loader.moduleSpecifierFromName = function(load, moduleName) {
		var deps = load.metadata.dependencies;
		if(!deps) return undefined;
		var idx = deps.indexOf(moduleName);
		return load.metadata.deps[idx];
	};
	loader._allowModuleExecution = {};
	loader.allowModuleExecution = function(name){
		var loader = this;
		return loader.normalize(name).then(function(name){
			loader._allowModuleExecution[name] = true;
		});
	};

	function eachOf(obj, callback){
		var name, val;
		for(name in obj) {
			callback(name, obj[name]);
		}
	}

	var normalize = loader.normalize;
	loader.normalize = function(name, parentName){
		var normalizePromise = normalize.apply(this, arguments);

		if(parentName) {
			var parentMap = this._traceData.parentMap;
			return normalizePromise.then(function(name){
				if(!parentMap[name]) {
					parentMap[name] = {};
				}
				parentMap[name][parentName] = true;
				return name;
			});
		}

		return normalizePromise;
	};

	var emptyExecute = function(){
		return loader.newModule({});
	};

	var passThroughModules = {
		traceur: true,
		babel: true
	};
	var isAllowedToExecute = function(load){
		return passThroughModules[load.name] || this._allowModuleExecution[load.name];
	};

	var map = [].map || function(callback){
		var res = [];
		for(var i = 0, len = this.length; i < len; i++) {
			res.push(callback(this[i]));
		}
		return res;
	};

	var esImportDepsExp = /import [\s\S]*?["'](.+)["']/g;
	var esExportDepsExp = /export .+ from ["'](.+)["']/g;
	var commentRegEx = /(?:(?:^|\s)\/\/(.+?)$)|(?:\/\*([\S\s]*?)\*\/)/gm;
	var stringRegEx = /(?:("|')[^\1\\\n\r]*(?:\\.[^\1\\\n\r]*)*\1|`[^`]*`)/g;

	function getESDeps(source) {
		var cleanSource = source.replace(commentRegEx, "");

		esImportDepsExp.lastIndex = commentRegEx.lastIndex =
			esExportDepsExp.lastIndex = stringRegEx.lastIndex = 0;

		var match;
		var deps = [];
		var stringLocations = []; // track string for unminified source

		function inLocation(locations, match) {
		  for (var i = 0; i < locations.length; i++)
			if (locations[i][0] < match.index && locations[i][1] > match.index)
			  return true;
		  return false;
		}

		function addDeps(exp) {
			while (match = exp.exec(cleanSource)) {
			  // ensure we're not within a string location
			  if (!inLocation(stringLocations, match)) {
				var dep = match[1];
				deps.push(dep);
			  }
			}
		}

		if (source.length / source.split('\n').length < 200) {
		  while (match = stringRegEx.exec(cleanSource))
			stringLocations.push([match.index, match.index + match[0].length]);
		}

		addDeps(esImportDepsExp);
		addDeps(esExportDepsExp);

		return deps;
	}

	var instantiate = loader.instantiate;
	loader.instantiate = function(load){
		this._traceData.loads[load.name] = load;
		var loader = this;
		var instantiatePromise = Promise.resolve(instantiate.apply(this, arguments));

		function finalizeResult(result){
			var preventExecution = loader.preventModuleExecution &&
				!isAllowedToExecute.call(loader, load);

			// deps either comes from the instantiate result, or if an
			// es6 module it was found in the transpile hook.
			var deps = result ? result.deps : load.metadata.deps;
			var normalize = loader.normalizeSpecifier || loader.normalize;

			return Promise.all(map.call(deps, function(depName){
				return normalize.call(loader, depName, load.name);
			})).then(function(dependencies){
				load.metadata.deps = deps;
				load.metadata.dependencies = dependencies;

				if(preventExecution) {
					return {
						deps: deps,
						execute: emptyExecute
					};
				}

				return result;

			});
		}

		return instantiatePromise.then(function(result){
			// This must be es6
			if(!result) {
				var deps = getESDeps(load.source);
				load.metadata.deps = deps;
			}
			return finalizeResult(result);
		});
	};

	var transpile = loader.transpile;
	// Allow transpile to be memoized, but only once
	loader.transpile = function(load){
		var transpiled = load.metadata.transpiledSource;
		if(transpiled) {
			delete load.metadata.transpiledSource;
			return Promise.resolve(transpiled);
		}
		return transpile.apply(this, arguments);
	};

	loader.eachModule = function(cb){
		for (var moduleName in this._loader.modules) {
			cb.call(this, moduleName, this.get(moduleName));
		}
	};
});

// Steal JSON Format
// Provides the JSON module format definition.
addStealExtension(function addJSON(loader) {
  var jsonExt = /\.json$/i;
  var jsExt = /\.js$/i;

  // taken from prototypejs
  // https://github.com/sstephenson/prototype/blob/master/src/prototype/lang/string.js#L682-L706
  function isJSON(json) {
	var str = json;
    if (!str) return false;

    str = str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
    str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
    str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
    return (/^[\],:{}\s]*$/).test(str);
  }

  // if someone has a moduleName that is .json, make sure it loads a json file
  // no matter what paths might do
  var loaderLocate = loader.locate;
  loader.locate = function(load){
    return loaderLocate.apply(this, arguments).then(function(address){
      if(jsonExt.test(load.name)) {
        return address.replace(jsExt, "");
      }

      return address;
    });
  };

  var transform = function(loader, load, data){
    var fn = loader.jsonOptions && loader.jsonOptions.transform;
    if(!fn) return data;
    return fn.call(loader, load, data);
  };

  // If we are in a build we should convert to CommonJS instead.
  if(isNode) {
    var loaderTranslate = loader.translate;
    loader.translate = function(load){
      var address = load.metadata.address || load.address;
      if(jsonExt.test(address) && load.name.indexOf('!') === -1) {
        var parsed = parse.call(this, load);
        if(parsed) {
          parsed = transform(this, load, parsed);
          return "def" + "ine([], function(){\n" +
            "\treturn " + JSON.stringify(parsed) + "\n});";
        }
      }

      return loaderTranslate.call(this, load);
    };
    return;
  }

  var loaderInstantiate = loader.instantiate;
  loader.instantiate = function(load) {
    var loader = this,
      parsed;

    parsed = parse.call(this, load);
    if(parsed) {
      parsed = transform(loader, load, parsed);
      load.metadata.format = 'json';

      load.metadata.execute = function(){
        return parsed;
      };
    }

    return loaderInstantiate.call(loader, load);
  };

  return loader;

  // Attempt to parse a load as json.
  function parse(load){
    if ((load.metadata.format === 'json' || !load.metadata.format) &&
		(isJSON(load.source) || jsonExt.test(load.name))) {
      try {
        return JSON.parse(load.source);
      } catch(e) {
		var warn = console.warn.bind(console);
		if(e instanceof SyntaxError) {
			var loc = this._parseSyntaxErrorLocation(e, load);

			if(loc) {
				var msg = "Unable to parse " + load.address;
				var newError = new SyntaxError(msg);
				newError.promise = this._addSourceInfoToError(newError,
					loc, load, "JSON.parse");
				throw newError;
			}
		}
        warn("Error parsing " + load.address + ":", e);
        return {};
      }
    }

  }
});

// Steal Cache-Bust Extension
// if enabled, Steal Cache-Bust will add a
// cacheKey and cacheVersion to the required file address
addStealExtension(function addCacheBust(loader) {
	var fetch = loader.fetch;

	loader.fetch = function(load) {
		var loader = this;

		if(loader.isEnv("production") && loader.cacheVersion) {
			var cacheVersion = loader.cacheVersion,
				cacheKey = loader.cacheKey || "version",
				cacheKeyVersion = cacheKey + "=" + cacheVersion;

			load.address = load.address + (load.address.indexOf('?') === -1 ? '?' : '&') + cacheKeyVersion;
		}
		return fetch.call(this, load);
	};
});

	// Overwrites System.config with setter hooks
	var setterConfig = function(loader, configOrder, configSpecial){
		var oldConfig = loader.config;

		loader.config =  function(cfg){

			var data = extend({},cfg);
			// check each special
			each(configOrder, function(name){
				var special = configSpecial[name];
				// if there is a setter and a value
				if(special.set && data[name]){
					// call the setter
					var res = special.set.call(loader,data[name], cfg);
					// if the setter returns a value
					if(res !== undefined) {
						// set that on the loader
						loader[name] = res;
					}
					// delete the property b/c setting is done
					delete data[name];
				}
			});
			oldConfig.call(this, data);
		};
	};

	var setIfNotPresent = function(obj, prop, value){
		if(!obj[prop]) {
			obj[prop] = value;
		}
	};

	// steal.js's default configuration values
	System.configMain = "@config";
	System.devBundle = "@empty";
	System.depsBundle = "@empty";
	System.paths[System.configMain] = "stealconfig.js";
	System.env = (isWebWorker ? "worker" : "window") + "-development";
	System.ext = Object.create(null);
	System.logLevel = 0;
	System.forceES5 = true;
	var cssBundlesNameGlob = "bundles/*.css",
		jsBundlesNameGlob = "bundles/*";
	setIfNotPresent(System.paths,cssBundlesNameGlob, "dist/bundles/*css");
	setIfNotPresent(System.paths,jsBundlesNameGlob, "dist/bundles/*.js");
	var less = System.global.less || (System.global.less = {});
	less.async = true;

	var configSetter = function(order){
		return {
			order: order,
			set: function(val){
				var name = filename(val),
					root = dir(val);

				if(!isNode) {
					System.configPath = joinURIs( location.href, val);
				}
				System.configMain = name;
				System.paths[name] = name;
				this.config({ baseURL: (root === val ? "." : root) + "/" });
			}
		}
	},
		valueSetter = function(prop, order) {
			return {
				order: order,
				set: function(val) {
					this[prop] = val;
				}
			}
		},
		booleanSetter = function(prop, order) {
			return {
				order: order,
				set: function(val) {
					this[prop] = !!val && val !== "false";
				}
			}
		},
		fileSetter = function(prop, order) {
			return {
				order: order,
				set: function(val) {
					this[prop] = envPath(val);
				}
			};
		};

	// checks if we're running in node, then prepends the "file:" protocol if we are
	var envPath = function(pathVal) {
		var val = pathVal;
		if(isNode && !/^file:/.test(val)) {
			// If relative join with the current working directory
			if(val[0] === "." && (val[1] === "/" ||
								 (val[1] === "." && val[2] === "/"))) {
				val = require("path").join(process.cwd(), val);
			}
			if(!val) return val;

			return "file:" + val;
		}
		return val;
	};

	var setToSystem = function(prop){
		return {
			set: function(val){
				if(typeof val === "object" && typeof steal.System[prop] === "object") {
					this[prop] = extend(this[prop] || {},val || {});
				} else {
					this[prop] = val;
				}
			}
		};
	};

	var pluginPart = function(name) {
		var bang = name.lastIndexOf("!");
		if(bang !== -1) {
			return name.substr(bang+1);
		}
	};

	var pluginResource = function(name){
		var bang = name.lastIndexOf("!");
		if(bang !== -1) {
			return name.substr(0, bang);
		}
	};

	var addProductionBundles = function(){
		// we don't want add the main bundled module if steal is bundled inside!
		if(this.loadBundles && this.main && !this.stealBundled) {
			var main = this.main,
				bundlesDir = this.bundlesName || "bundles/",
				mainBundleName = bundlesDir+main;

			setIfNotPresent(this.meta, mainBundleName, {format:"amd"});

			// If the configMain has a plugin like package.json!npm,
			// plugin has to be defined prior to importing.
			var plugin = pluginPart(System.configMain);
			var bundle = [main, System.configMain];
			if(plugin){
				System.set(plug