/**
 * This file is part of the NocoBase (R) project.
 * Copyright (c) 2020-2024 NocoBase Co., Ltd.
 * Authors: NocoBase Team.
 *
 * This project is dual-licensed under AGPL-3.0 and NocoBase Commercial License.
 * For more information, please refer to: https://www.nocobase.com/agreement.
 */

/* istanbul ignore file -- @preserve */
// @ts-nocheck
/* eslint-disable */
/* prettier-ignore */
import type { Require, RequireDefine } from './types'

export interface RequireJS {
  require: Require
  requirejs: Require
  define: RequireDefine
}

/**
 * @internal
 */
export function getRequireJs(): RequireJS {
  var requirejs, require, define;
  var req, s, head, baseElement, dataMain, src,
    interactiveScript, currentlyAddingScript, mainScript, subPath,
    version = '2.3.6',
    commentRegExp = /\/\*[\s\S]*?\*\/|([^:"'=]|^)\/\/.*$/mg,
    cjsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g,
    jsSuffixRegExp = /\.js$/,
    currDirRegExp = /^\.\//,
    op = Object.prototype,
    ostring = op.toString,
    hasOwn = op.hasOwnProperty,
    isBrowser = !!(typeof window !== 'undefined' && typeof navigator !== 'undefined' && window.document),
    isWebWorker = !isBrowser && typeof importScripts !== 'undefined',
    //PS3 indicates loaded and complete, but need to wait for complete
    //specifically. Sequence is 'loading', 'loaded', execution,
    // then 'complete'. The UA check is unfortunate, but not sure how
    //to feature test w/o causing perf issues.
    readyRegExp = isBrowser && navigator.platform === 'PLAYSTATION 3' ?
      /^complete$/ : /^(complete|loaded)$/,
    defContextName = '_',
    //Oh the tragedy, detecting opera. See the usage of isOpera for reason.
    isOpera = typeof opera !== 'undefined' && opera.toString() === '[object Opera]',
    contexts = {},
    cfg = {},
    globalDefQueue = [],
    useInteractive = false;

  //Could match something like ')//comment', do not lose the prefix to comment.
  function commentReplace(match, singlePrefix) {
    return singlePrefix || '';
  }

  function isFunction(it) {
    return ostring.call(it) === '[object Function]';
  }

  function isArray(it) {
    return ostring.call(it) === '[object Array]';
  }

  /**
   * Helper function for iterating over an array. If the func returns
   * a true value, it will break out of the loop.
   */
  function each(ary, func) {
    if (ary) {
      var i;
      for (i = 0; i < ary.length; i += 1) {
        if (ary[i] && func(ary[i], i, ary)) {
          break;
        }
      }
    }
  }

  /**
   * Helper function for iterating over an array backwards. If the func
   * returns a true value, it will break out of the loop.
   */
  function eachReverse(ary, func) {
    if (ary) {
      var i;
      for (i = ary.length - 1; i > -1; i -= 1) {
        if (ary[i] && func(ary[i], i, ary)) {
          break;
        }
      }
    }
  }

  function hasProp(obj, prop) {
    return hasOwn.call(obj, prop);
  }

  function getOwn(obj, prop) {
    return hasProp(obj, prop) && obj[prop];
  }

  /**
   * Cycles over properties in an object and calls a function for each
   * property value. If the function returns a truthy value, then the
   * iteration is stopped.
   */
  function eachProp(obj, func) {
    var prop;
    for (prop in obj) {
      if (hasProp(obj, prop)) {
        if (func(obj[prop], prop)) {
          break;
        }
      }
    }
  }

  /**
   * Simple function to mix in properties from source into target,
   * but only if target does not already have a property of the same name.
   */
  function mixin(target, source, force, deepStringMixin) {
    if (source) {
      eachProp(source, function (value, prop) {
        if (force || !hasProp(target, prop)) {
          if (deepStringMixin && typeof value === 'object' && value &&
            !isArray(value) && !isFunction(value) &&
            !(value instanceof RegExp)) {

            if (!target[prop]) {
              target[prop] = {};
            }
            mixin(target[prop], value, force, deepStringMixin);
          } else {
            target[prop] = value;
          }
        }
      });
    }
    return target;
  }

  //Similar to Function.prototype.bind, but the 'this' object is specified
  //first, since it is easier to read/figure out what 'this' will be.
  function bind(obj, fn) {
    return function () {
      return fn.apply(obj, arguments);
    };
  }

  function scripts() {
    return document.getElementsByTagName('script');
  }

  function defaultOnError(err) {
    throw err;
  }

  //Allow getting a global that is expressed in
  //dot notation, like 'a.b.c'.
  function getGlobal(value) {
    if (!value) {
      return value;
    }
    var g = global;
    each(value.split('.'), function (part) {
      g = g[part];
    });
    return g;
  }

  /**
   * Constructs an error with a pointer to an URL with more information.
   * @param {String} id the error ID that maps to an ID on a web page.
   * @param {String} message human readable error.
   * @param {Error} [err] the original error, if there is one.
   *
   * @returns {Error}
   */
  function makeError(id, msg, err, requireModules) {
    var e = new Error(msg + '\nhttps://requirejs.org/docs/errors.html#' + id);
    e.requireType = id;
    e.requireModules = requireModules;
    if (err) {
      e.originalError = err;
    }
    return e;
  }

  if (typeof define !== 'undefined') {
    //If a define is already in play via another AMD loader,
    //do not overwrite.
    return;
  }

  if (typeof requirejs !== 'undefined') {
    if (isFunction(requirejs)) {
      //Do not overwrite an existing requirejs instance.
      return;
    }
    cfg = requirejs;
    requirejs = undefined;
  }

  //Allow for a require config object
  if (typeof require !== 'undefined' && !isFunction(require)) {
    //assume it is a config object.
    cfg = require;
    require = undefined;
  }

  function newContext(contextName) {
    var inCheckLoaded, Module, context, handlers,
      checkLoadedTimeoutId,
      config = {
        //Defaults. Do not set a default for map
        //config to speed up normalize(), which
        //will run faster if there is no default.
        waitSeconds: 7,
        baseUrl: './',
        paths: {},
        bundles: {},
        pkgs: {},
        shim: {},
        config: {}
      },
      registry = {},
      //registry of just enabled modules, to speed
      //cycle breaking code when lots of modules
      //are registered, but not activated.
      enabledRegistry = {},
      undefEvents = {},
      defQueue = [],
      defined = {},
      urlFetched = {},
      bundlesMap = {},
      requireCounter = 1,
      unnormalizedCounter = 1;

    /**
     * Trims the . and .. from an array of path segments.
     * It will keep a leading path segment if a .. will become
     * the first path segment, to help with module name lookups,
     * which act like paths, but can be remapped. But the end result,
     * all paths that use this function should look normalized.
     * NOTE: this method MODIFIES the input array.
     * @param {Array} ary the array of path segments.
     */
    function trimDots(ary) {
      var i, part;
      for (i = 0; i < ary.length; i++) {
        part = ary[i];
        if (part === '.') {
          ary.splice(i, 1);
          i -= 1;
        } else if (part === '..') {
          // If at the start, or previous value is still ..,
          // keep them so that when converted to a path it may
          // still work when converted to a path, even though
          // as an ID it is less than ideal. In larger point
          // releases, may be better to just kick out an error.
          if (i === 0 || (i === 1 && ary[2] === '..') || ary[i - 1] === '..') {
            continue;
          } else if (i > 0) {
            ary.splice(i - 1, 2);
            i -= 2;
          }
        }
      }
    }

    /**
     * Given a relative module name, like ./something, normalize it to
     * a real name that can be mapped to a path.
     * @param {String} name the relative name
     * @param {String} baseName a real name that the name arg is relative
     * to.
     * @param {Boolean} applyMap apply the map config to the value. Should
     * only be done if this normalization is for a dependency ID.
     * @returns {String} normalized name
     */
    function normalize(name, baseName, applyMap) {
      var pkgMain, mapValue, nameParts, i, j, nameSegment, lastIndex,
        foundMap, foundI, foundStarMap, starI, normalizedBaseParts,
        baseParts = (baseName && baseName.split('/')),
        map = config.map,
        starMap = map && map['*'];

      //Adjust any relative paths.
      if (name) {
        name = name.split('/');
        lastIndex = name.length - 1;

        // If wanting node ID compatibility, strip .js from end
        // of IDs. Have to do this here, and not in nameToUrl
        // because node allows either .js or non .js to map
        // to same file.
        if (config.nodeIdCompat && jsSuffixRegExp.test(name[lastIndex])) {
          name[lastIndex] = name[lastIndex].replace(jsSuffixRegExp, '');
        }

        // Starts with a '.' so need the baseName
        if (name[0].charAt(0) === '.' && baseParts) {
          //Convert baseName to array, and lop off the last part,
          //so that . matches that 'directory' and not name of the baseName's
          //module. For instance, baseName of 'one/two/three', maps to
          //'one/two/three.js', but we want the directory, 'one/two' for
          //this normalization.
          normalizedBaseParts = baseParts.slice(0, baseParts.length - 1);
          name = normalizedBaseParts.concat(name);
        }

        trimDots(name);
        name = name.join('/');
      }

      //Apply map config if available.
      if (applyMap && map && (baseParts || starMap)) {
        nameParts = name.split('/');

        outerLoop: for (i = nameParts.length; i > 0; i -= 1) {
          nameSegment = nameParts.slice(0, i).join('/');

          if (baseParts) {
            //Find the longest baseName segment match in the config.
            //So, do joins on the biggest to smallest lengths of baseParts.
            for (j = baseParts.length; j > 0; j -= 1) {
              mapValue = getOwn(map, baseParts.slice(0, j).join('/'));

              //baseName segment has config, find if it has one for
              //this name.
              if (mapValue) {
                mapValue = getOwn(mapValue, nameSegment);
                if (mapValue) {
                  //Match, update name to the new value.
                  foundMap = mapValue;
                  foundI = i;
                  break outerLoop;
                }
              }
            }
          }

          //Check for a star map match, but just hold on to it,
          //if there is a shorter segment match later in a matching
          //config, then favor over this star map.
          if (!foundStarMap && starMap && getOwn(starMap, nameSegment)) {
            foundStarMap = getOwn(starMap, nameSegment);
            starI = i;
          }
        }

        if (!foundMap && foundStarMap) {
          foundMap = foundStarMap;
          foundI = starI;
        }

        if (foundMap) {
          nameParts.splice(0, foundI, foundMap);
          name = nameParts.join('/');
        }
      }

      // If the name points to a package's name, use
      // the package main instead.
      pkgMain = getOwn(config.pkgs, name);

      return pkgMain ? pkgMain : name;
    }

    function removeScript(name) {
      if (isBrowser) {
        each(scripts(), function (scriptNode) {
          if (scriptNode.getAttribute('data-requiremodule') === name &&
            scriptNode.getAttribute('data-requirecontext') === context.contextName) {
            scriptNode.parentNode.removeChild(scriptNode);
            return true;
          }
        });
      }
    }

    function hasPathFallback(id) {
      var pathConfig = getOwn(config.paths, id);
      if (pathConfig && isArray(pathConfig) && pathConfig.length > 1) {
        //Pop off the first array value, since it failed, and
        //retry
        pathConfig.shift();
        context.require.undef(id);

        //Custom require that does not do map translation, since
        //ID is "absolute", already mapped/resolved.
        context.makeRequire(null, {
          skipMap: true
        })([id]);

        return true;
      }
    }

    //Turns a plugin!resource to [plugin, resource]
    //with the plugin being undefined if the name
    //did not have a plugin prefix.
    function splitPrefix(name) {
      var prefix,
        index = name ? name.indexOf('!') : -1;
      if (index > -1) {
        prefix = name.substring(0, index);
        name = name.substring(index + 1, name.length);
      }
      return [prefix, name];
    }

    /**
     * Creates a module mapping that includes plugin prefix, module
     * name, and path. If parentModuleMap is provided it will
     * also normalize the name via require.normalize()
     *
     * @param {String} name the module name
     * @param {String} [parentModuleMap] parent module map
     * for the module name, used to resolve relative names.
     * @param {Boolean} isNormalized: is the ID already normalized.
     * This is true if this call is done for a define() module ID.
     * @param {Boolean} applyMap: apply the map config to the ID.
     * Should only be true if this map is for a dependency.
     *
     * @returns {Object}
     */
    function makeModuleMap(name, parentModuleMap, isNormalized, applyMap) {
      var url, pluginModule, suffix, nameParts,
        prefix = null,
        parentName = parentModuleMap ? parentModuleMap.name : null,
        originalName = name,
        isDefine = true,
        normalizedName = '';

      //If no name, then it means it is a require call, generate an
      //internal name.
      if (!name) {
        isDefine = false;
        name = '_@r' + (requireCounter += 1);
      }

      nameParts = splitPrefix(name);
      prefix = nameParts[0];
      name = nameParts[1];

      if (prefix) {
        prefix = normalize(prefix, parentName, applyMap);
        pluginModule = getOwn(defined, prefix);
      }

      //Account for relative paths if there is a base name.
      if (name) {
        if (prefix) {
          if (isNormalized) {
            normalizedName = name;
          } else if (pluginModule && pluginModule.normalize) {
            //Plugin is loaded, use its normalize method.
            normalizedName = pluginModule.normalize(name, function (name) {
              return normalize(name, parentName, applyMap);
            });
          } else {
            // If nested plugin references, then do not try to
            // normalize, as it will not normalize correctly. This
            // places a restriction on resourceIds, and the longer
            // term solution is not to normalize until plugins are
            // loaded and all normalizations to allow for async
            // loading of a loader plugin. But for now, fixes the
            // common uses. Details in #1131
            normalizedName = name.indexOf('!') === -1 ?
              normalize(name, parentName, applyMap) :
              name;
          }
        } else {
          //A regular module.
          normalizedName = normalize(name, parentName, applyMap);

          //Normalized name may be a plugin ID due to map config
          //application in normalize. The map config values must
          //already be normalized, so do not need to redo that part.
          nameParts = splitPrefix(normalizedName);
          prefix = nameParts[0];
          normalizedName = nameParts[1];
          isNormalized = true;

          url = context.nameToUrl(normalizedName);
        }
      }

      //If the id is a plugin id that cannot be determined if it needs
      //normalization, stamp it with a unique ID so two matching relative
      //ids that may conflict can be separate.
      suffix = prefix && !pluginModule && !isNormalized ?
        '_unnormalized' + (unnormalizedCounter += 1) :
        '';

      return {
        prefix: prefix,
        name: normalizedName,
        parentMap: parentModuleMap,
        unnormalized: !!suffix,
        url: url,
        originalName: originalName,
        isDefine: isDefine,
        id: (prefix ?
          prefix + '!' + normalizedName :
          normalizedName) + suffix
      };
    }

    function getModule(depMap) {
      var id = depMap.id,
        mod = getOwn(registry, id);

      if (!mod) {
        mod = registry[id] = new context.Module(depMap);
      }

      return mod;
    }

    function on(depMap, name, fn) {
      var id = depMap.id,
        mod = getOwn(registry, id);

      if (hasProp(defined, id) &&
        (!mod || mod.defineEmitComplete)) {
        if (name === 'defined') {
          fn(defined[id]);
        }
      } else {
        mod = getModule(depMap);
        if (mod.error && name === 'error') {
          fn(mod.error);
        } else {
          mod.on(name, fn);
        }
      }
    }

    function onError(err, errback) {
      var ids = err.requireModules,
        notified = false;

      if (errback) {
        errback(err);
      } else {
        each(ids, function (id) {
          var mod = getOwn(registry, id);
          if (mod) {
            //Set error on module, so it skips timeout checks.
            mod.error = err;
            if (mod.events.error) {
              notified = true;
              mod.emit('error', err);
            }
          }
        });

        if (!notified) {
          req.onError(err);
        }
      }
    }

    /**
     * Internal method to transfer globalQueue items to this context's
     * defQueue.
     */
    function takeGlobalQueue() {
      //Push all the globalDefQueue items into the context's defQueue
      if (globalDefQueue.length) {
        each(globalDefQueue, function (queueItem) {
          var id = queueItem[0];
          if (typeof id === 'string') {
            context.defQueueMap[id] = true;
          }
          defQueue.push(queueItem);
        });
        globalDefQueue = [];
      }
    }

    handlers = {
      'require': function (mod) {
        if (mod.require) {
          return mod.require;
        } else {
          return (mod.require = context.makeRequire(mod.map));
        }
      },
      'exports': function (mod) {
        mod.usingExports = true;
        if (mod.map.isDefine) {
          if (mod.exports) {
            return (defined[mod.map.id] = mod.exports);
          } else {
            return (mod.exports = defined[mod.map.id] = {});
          }
        }
      },
      'module': function (mod) {
        if (mod.module) {
          return mod.module;
        } else {
          return (mod.module = {
            id: mod.map.id,
            uri: mod.map.url,
            config: function () {
              return getOwn(config.config, mod.map.id) || {};
            },
            exports: mod.exports || (mod.exports = {})
          });
        }
      }
    };

    function cleanRegistry(id) {
      //Clean up machinery used for waiting modules.
      delete registry[id];
      delete enabledRegistry[id];
    }

    function breakCycle(mod, traced, processed) {
      var id = mod.map.id;

      if (mod.error) {
        mod.emit('error', mod.error);
      } else {
        traced[id] = true;
        each(mod.depMaps, function (depMap, i) {
          var depId = depMap.id,
            dep = getOwn(registry, depId);

          //Only force things that have not completed
          //being defined, so still in the registry,
          //and only if it has not been matched up
          //in the module already.
          if (dep && !mod.depMatched[i] && !processed[depId]) {
            if (getOwn(traced, depId)) {
              mod.defineDep(i, defined[depId]);
              mod.check(); //pass false?
            } else {
              breakCycle(dep, traced, processed);
            }
          }
        });
        processed[id] = true;
      }
    }

    function checkLoaded() {
      var err, usingPathFallback,
        waitInterval = config.waitSeconds * 1000,
        //It is possible to disable the wait interval by using waitSeconds of 0.
        expired = waitInterval && (context.startTime + waitInterval) < new Date().getTime(),
        noLoads = [],
        reqCalls = [],
        stillLoading = false,
        needCycleCheck = true;

      //Do not bother if this call was a result of a cycle break.
      if (inCheckLoaded) {
        return;
      }

      inCheckLoaded = true;

      //Figure out the state of all the modules.
      eachProp(enabledRegistry, function (mod) {
        var map = mod.map,
          modId = map.id;

        //Skip things that are not enabled or in error state.
        if (!mod.enabled) {
          return;
        }

        if (!map.isDefine) {
          reqCalls.push(mod);
        }

        if (!mod.error) {
          //If the module should be executed, and it has not
          //been inited and time is up, remember it.
          if (!mod.inited && expired) {
            if (hasPathFallback(modId)) {
              usingPathFallback = true;
              stillLoading = true;
            } else {
              noLoads.push(modId);
              removeScript(modId);
            }
          } else if (!mod.inited && mod.fetched && map.isDefine) {
            stillLoading = true;
            if (!map.prefix) {
              //No reason to keep looking for unfinished
              //loading. If the only stillLoading is a
              //plugin resource though, keep going,
              //because it may be that a plugin resource
              //is waiting on a non-plugin cycle.
              return (needCycleCheck = false);
            }
          }
        }
      });

      if (expired && noLoads.length) {
        //If wait time expired, throw error of unloaded modules.
        err = makeError('timeout', 'Load timeout for modules: ' + noLoads, null, noLoads);
        err.contextName = context.contextName;
        return onError(err);
      }

      //Not expired, check for a cycle.
      if (needCycleCheck) {
        each(reqCalls, function (mod) {
          breakCycle(mod, {}, {});
        });
      }

      //If still waiting on loads, and the waiting load is something
      //other than a plugin resource, or there are still outstanding
      //scripts, then just try back later.
      if ((!expired || usingPathFallback) && stillLoading) {
        //Something is still waiting to load. Wait for it, but only
        //if a timeout is not already in effect.
        if ((isBrowser || isWebWorker) && !checkLoadedTimeoutId) {
          checkLoadedTimeoutId = setTimeout(function () {
            checkLoadedTimeoutId = 0;
            checkLoaded();
          }, 50);
        }
      }

      inCheckLoaded = false;
    }

    Module = function (map) {
      this.events = getOwn(undefEvents, map.id) || {};
      this.map = map;
      this.shim = getOwn(config.shim, map.id);
      this.depExports = [];
      this.depMaps = [];
      this.depMatched = [];
      this.pluginMaps = {};
      this.depCount = 0;

      /* this.exports this.factory
         this.depMaps = [],
         this.enabled, this.fetched
      */
    };

    Module.prototype = {
      init: function (depMaps, factory, errback, options) {
        options = options || {};

        //Do not do more inits if already done. Can happen if there
        //are multiple define calls for the same module. That is not
        //a normal, common case, but it is also not unexpected.
        if (this.inited) {
          return;
        }

        this.factory = factory;

        if (errback) {
          //Register for errors on this module.
          this.on('error', errback);
        } else if (this.events.error) {
          //If no errback already, but there are error listeners
          //on this module, set up an errback to pass to the deps.
          errback = bind(this, function (err) {
            this.emit('error', err);
          });
        }

        //Do a copy of the dependency array, so that
        //source inputs are not modified. For example
        //"shim" deps are passed in here directly, and
        //doing a direct modification of the depMaps array
        //would affect that config.
        this.depMaps = depMaps && depMaps.slice(0);

        this.errback = errback;

        //Indicate this module has be initialized
        this.inited = true;

        this.ignore = options.ignore;

        //Could have option to init this module in enabled mode,
        //or could have been previously marked as enabled. However,
        //the dependencies are not known until init is called. So
        //if enabled previously, now trigger dependencies as enabled.
        if (options.enabled || this.enabled) {
          //Enable this module and dependencies.
          //Will call this.check()
          this.enable();
        } else {
          this.check();
        }
      },

      defineDep: function (i, depExports) {
        //Because of cycles, defined callback for a given
        //export can be called more than once.
        if (!this.depMatched[i]) {
          this.depMatched[i] = true;
          this.depCount -= 1;
          this.depExports[i] = depExports;
        }
      },

      fetch: function () {
        if (this.fetched) {
          return;
        }
        this.fetched = true;

        context.startTime = (new Date()).getTime();

        var map = this.map;

        //If the manager is for a plugin managed resource,
        //ask the plugin to load it now.
        if (this.shim) {
          context.makeRequire(this.map, {
            enableBuildCallback: true
          })(this.shim.deps || [], bind(this, function () {
            return map.prefix ? this.callPlugin() : this.load();
          }));
        } else {
          //Regular dependency.
          return map.prefix ? this.callPlugin() : this.load();
        }
      },

      load: function () {
        var url = this.map.url;

        //Regular dependency.
        if (!urlFetched[url]) {
          urlFetched[url] = true;
          context.load(this.map.id, url);
        }
      },

      /**
       * Checks if the module is ready to define itself, and if so,
       * define it.
       */
      check: function () {
        if (!this.enabled || this.enabling) {
          return;
        }

        var err, cjsModule,
          id = this.map.id,
          depExports = this.depExports,
          exports = this.exports,
          factory = this.factory;

        if (!this.inited) {
          // Only fetch if not already in the defQueue.
          if (!hasProp(context.defQueueMap, id)) {
            this.fetch();
          }
        } else if (this.error) {
          this.emit('error', this.error);
        } else if (!this.defining) {
          //The factory could trigger another require call
          //that would result in checking this module to
          //define itself again. If already in the process
          //of doing that, skip this work.
          this.defining = true;

          if (this.depCount < 1 && !this.defined) {
            if (isFunction(factory)) {
              //If there is an error listener, favor passing
              //to that instead of throwing an error. However,
              //only do it for define()'d  modules. require
              //errbacks should not be called for failures in
              //their callbacks (#699). However if a global
              //onError is set, use that.
              if ((this.events.error && this.map.isDefine) ||
                req.onError !== defaultOnError) {
                try {
                  exports = context.execCb(id, factory, depExports, exports);
                } catch (e) {
                  err = e;
                }
              } else {
                exports = context.execCb(id, factory, depExports, exports);
              }

              // Favor return value over exports. If node/cjs in play,
              // then will not have a return value anyway. Favor
              // module.exports assignment over exports object.
              if (this.map.isDefine && exports === undefined) {
                cjsModule = this.module;
                if (cjsModule) {
                  exports = cjsModule.exports;
                } else if (this.usingExports) {
                  //exports already set the defined value.
                  exports = this.exports;
                }
              }

              if (err) {
                err.requireMap = this.map;
                err.requireModules = this.map.isDefine ? [this.map.id] : null;
                err.requireType = this.map.isDefine ? 'define' : 'require';
                return onError((this.error = err));
              }

            } else {
              //Just a literal value
              exports = factory;
            }

            this.exports = exports;

            if (this.map.isDefine && !this.ignore) {
              defined[id] = exports;

              if (req.onResourceLoad) {
                var resLoadMaps = [];
                each(this.depMaps, function (depMap) {
                  resLoadMaps.push(depMap.normalizedMap || depMap);
                });
                req.onResourceLoad(context, this.map, resLoadMaps);
              }
            }

            //Clean up
            cleanRegistry(id);

            this.defined = true;
          }

          //Finished the define stage. Allow calling check again
          //to allow define notifications below in the case of a
          //cycle.
          this.defining = false;

          if (this.defined && !this.defineEmitted) {
            this.defineEmitted = true;
            this.emit('defined', this.exports);
            this.defineEmitComplete = true;
          }

        }
      },

      callPlugin: function () {
        var map = this.map,
          id = map.id,
          //Map already normalized the prefix.
          pluginMap = makeModuleMap(map.prefix);

        //Mark this as a dependency for this plugin, so it
        //can be traced for cycles.
        this.depMaps.push(pluginMap);

        on(pluginMap, 'defined', bind(this, function (plugin) {
          var load, normalizedMap, normalizedMod,
            bundleId = getOwn(bundlesMap, this.map.id),
            name = this.map.name,
            parentName = this.map.parentMap ? this.map.parentMap.name : null,
            localRequire = context.makeRequire(map.parentMap, {
              enableBuildCallback: true
            });

          //If current map is not normalized, wait for that
          //normalized name to load instead of continuing.
          if (this.map.unnormalized) {
            //Normalize the ID if the plugin allows it.
            if (plugin.normalize) {
              name = plugin.normalize(name, function (name) {
                return normalize(name, parentName, true);
              }) || '';
            }

            //prefix and name should already be normalized, no need
            //for applying map config again either.
            normalizedMap = makeModuleMap(map.prefix + '!' + name,
              this.map.parentMap,
              true);
            on(normalizedMap,
              'defined', bind(this, function (value) {
                this.map.normalizedMap = normalizedMap;
                this.init([], function () { return value; }, null, {
                  enabled: true,
                  ignore: true
                });
              }));

            normalizedMod = getOwn(registry, normalizedMap.id);
            if (normalizedMod) {
              //Mark this as a dependency for this plugin, so it
              //can be traced for cycles.
              this.depMaps.push(normalizedMap);

              if (this.events.error) {
                normalizedMod.on('error', bind(this, function (err) {
                  this.emit('error', err);
                }));
              }
              normalizedMod.enable();
            }

            return;
          }

          //If a paths config, then just load that file instead to
          //resolve the plugin, as it is built into that paths layer.
          if (bundleId) {
            this.map.url = context.nameToUrl(bundleId);
            this.load();
            return;
          }

          load = bind(this, function (value) {
            this.init([], function () { return value; }, null, {
              enabled: true
            });
          });

          load.error = bind(this, function (err) {
            this.inited = true;
            this.error = err;
            err.requireModules = [id];

            //Remove temp unnormalized modules for this module,
            //since they will never be resolved otherwise now.
            eachProp(registry, function (mod) {
              if (mod.map.id.indexOf(id + '_unnormalized') === 0) {
                cleanRegistry(mod.map.id);
              }
            });

            onError(err);
          });

          //Allow plugins to load other code without having to know the
          //context or how to 'complete' the load.
          load.fromText = bind(this, function (text, textAlt) {
            /*jslint evil: true */
            var moduleName = map.name,
              moduleMap = makeModuleMap(moduleName),
              hasInteractive = useInteractive;

            //As of 2.1.0, support just passing the text, to reinforce
            //fromText only being called once per resource. Still
            //support old style of passing moduleName but discard
            //that moduleName in favor of the internal ref.
            if (textAlt) {
              text = textAlt;
            }

            //Turn off interactive script matching for IE for any define
            //calls in the text, then turn it back on at the end.
            if (hasInteractive) {
              useInteractive = false;
            }

            //Prime the system by creating a module instance for
            //it.
            getModule(moduleMap);

            //Transfer any config to this other module.
            if (hasProp(config.config, id)) {
              config.config[moduleName] = config.config[id];
            }

            try {
              req.exec(text);
            } catch (e) {
              return onError(makeError('fromtexteval',
                'fromText eval for ' + id +
                ' failed: ' + e,
                e,
                [id]));
            }

            if (hasInteractive) {
              useInteractive = true;
            }

            //Mark this as a dependency for the plugin
            //resource
            this.depMaps.push(moduleMap);

            //Support anonymous modules.
            context.completeLoad(moduleName);

            //Bind the value of that module to the value for this
            //resource ID.
            localRequire([moduleName], load);
          });

          //Use parentName here since the plugin's name is not reliable,
          //could be some weird string with no path that actually wants to
          //reference the parentName's path.
          plugin.load(map.name, localRequire, load, config);
        }));

        context.enable(pluginMap, this);
        this.pluginMaps[pluginMap.id] = pluginMap;
      },

      enable: function () {
        enabledRegistry[this.map.id] = this;
        this.enabled = true;

        //Set flag mentioning that the module is enabling,
        //so that immediate calls to the defined callbacks
        //for dependencies do not trigger inadvertent load
        //with the depCount still being zero.
        this.enabling = true;

        //Enable each dependency
        each(this.depMaps, bind(this, function (depMap, i) {
          var id, mod, handler;

          if (typeof depMap === 'string') {
            //Dependency needs to be converted to a depMap
            //and wired up to this module.
            depMap = makeModuleMap(depMap,
              (this.map.isDefine ? this.map : this.map.parentMap),
              false,
              !this.skipMap);
            this.depMaps[i] = depMap;

            handler = getOwn(handlers, depMap.id);

            if (handler) {
              this.depExports[i] = handler(this);
              return;
            }

            this.depCount += 1;

            on(depMap, 'defined', bind(this, function (depExports) {
              if (this.undefed) {
                return;
              }
              this.defineDep(i, depExports);
              this.check();
            }));

            if (this.errback) {
              on(depMap, 'error', bind(this, this.errback));
            } else if (this.events.error) {
              // No direct errback on this module, but something
              // else is listening for errors, so be sure to
              // propagate the error correctly.
              on(depMap, 'error', bind(this, function (err) {
                this.emit('error', err);
              }));
            }
          }

          id = depMap.id;
          mod = registry[id];

          //Skip special modules like 'require', 'exports', 'module'
          //Also, don't call enable if it is already enabled,
          //important in circular dependency cases.
          if (!hasProp(handlers, id) && mod && !mod.enabled) {
            context.enable(depMap, this);
          }
        }));

        //Enable each plugin that is used in
        //a dependency
        eachProp(this.pluginMaps, bind(this, function (pluginMap) {
          var mod = getOwn(registry, pluginMap.id);
          if (mod && !mod.enabled) {
            context.enable(pluginMap, this);
          }
        }));

        this.enabling = false;

        this.check();
      },

      on: function (name, cb) {
        var cbs = this.events[name];
        if (!cbs) {
          cbs = this.events[name] = [];
        }
        cbs.push(cb);
      },

      emit: function (name, evt) {
        each(this.events[name], function (cb) {
          cb(evt);
        });
        if (name === 'error') {
          //Now that the error handler was triggered, remove
          //the listeners, since this broken Module instance
          //can stay around for a while in the registry.
          delete this.events[name];
        }
      }
    };

    function callGetModule(args) {
      //Skip modules already defined.
      if (!hasProp(defined, args[0])) {
        getModule(makeModuleMap(args[0], null, true)).init(args[1], args[2]);
      }
    }

    function removeListener(node, func, name, ieName) {
      //Favor detachEvent because of IE9
      //issue, see attachEvent/addEventListener comment elsewhere
      //in this file.
      if (node.detachEvent && !isOpera) {
        //Probably IE. If not it will throw an error, which will be
        //useful to know.
        if (ieName) {
          node.detachEvent(ieName, func);
        }
      } else {
        node.removeEventListener(name, func, false);
      }
    }

    /**
     * Given an event from a script node, get the requirejs info from it,
     * and then removes the event listeners on the node.
     * @param {Event} evt
     * @returns {Object}
     */
    function getScriptData(evt) {
      //Using currentTarget instead of target for Firefox 2.0's sake. Not
      //all old browsers will be supported, but this one was easy enough
      //to support and still makes sense.
      var node = evt.currentTarget || evt.srcElement;

      //Remove the listeners once here.
      removeListener(node, context.onScriptLoad, 'load', 'onreadystatechange');
      removeListener(node, context.onScriptError, 'error');

      return {
        node: node,
        id: node && node.getAttribute('data-requiremodule')
      };
    }

    function intakeDefines() {
      var args;

      //Any defined modules in the global queue, intake them now.
      takeGlobalQueue();

      //Make sure any remaining defQueue items get properly processed.
      while (defQueue.length) {
        args = defQueue.shift();
        if (args[0] === null) {
          return onError(makeError('mismatch', 'Mismatched anonymous define() module: ' +
            args[args.length - 1]));
        } else {
          //args are id, deps, factory. Should be normalized by the
          //define() function.
          callGetModule(args);
        }
      }
      context.defQueueMap = {};
    }

    context = {
      config: config,
      contextName: contextName,
      registry: registry,
      defined: defined,
      urlFetched: urlFetched,
      defQueue: defQueue,
      defQueueMap: {},
      Module: Module,
      makeModuleMap: makeModuleMap,
      nextTick: req.nextTick,
      onError: onError,

      /**
       * Set a configuration for the context.
       * @param {Object} cfg config object to integrate.
       */
      configure: function (cfg) {
        //Make sure the baseUrl ends in a slash.
        if (cfg.baseUrl) {
          if (cfg.baseUrl.charAt(cfg.baseUrl.length - 1) !== '/') {
            cfg.baseUrl += '/';
          }
        }

        // Convert old style urlArgs string to a function.
        if (typeof cfg.urlArgs === 'string') {
          var urlArgs = cfg.urlArgs;
          cfg.urlArgs = function (id, url) {
            return (url.indexOf('?') === -1 ? '?' : '&') + urlArgs;
          };
        }

        //Save off the paths since they require special processing,
        //they are additive.
        var shim = config.shim,
          objs = {
            paths: true,
            bundles: true,
            config: true,
            map: true
          };

        eachProp(cfg, function (value, prop) {
          if (objs[prop]) {
            if (!config[prop]) {
              config[prop] = {};
            }
            mixin(config[prop], value, true, true);
          } else {
            config[prop] = value;
          }
        });

        //Reverse map the bundles
        if (cfg.bundles) {
          eachProp(cfg.bundles, function (value, prop) {
            each(value, function (v) {
              if (v !== prop) {
                bundlesMap[v] = prop;
              }
            });
          });
        }

        //Merge shim
        if (cfg.shim) {
          eachProp(cfg.shim, function (value, id) {
            //Normalize the structure
            if (isArray(value)) {
              value = {
                deps: value
              };
            }
            if ((value.exports || value.init) && !value.exportsFn) {
              value.exportsFn = context.makeShimExports(value);
            }
            shim[id] = value;
          });
          config.shim = shim;
        }

        //Adjust packages if necessary.
        if (cfg.packages) {
          each(cfg.packages, function (pkgObj) {
            var location, name;

            pkgObj = typeof pkgObj === 'string' ? { name: pkgObj } : pkgObj;

            name = pkgObj.name;
            location = pkgObj.location;
            if (location) {
              config.paths[name] = pkgObj.location;
            }

            //Save pointer to main module ID for pkg name.
            //Remove leading dot in main, so main paths are normalized,
            //and remove any trailing .js, since different package
            //envs have different conventions: some use a module name,
            //some use a file name.
            config.pkgs[name] = pkgObj.name + '/' + (pkgObj.main || 'main')
              .replace(currDirRegExp, '')
              .replace(jsSuffixRegExp, '');
          });
        }

        //If there are any "waiting to execute" modules in the registry,
        //update the maps for them, since their info, like URLs to load,
        //may have changed.
        eachProp(registry, function (mod, id) {
          //If module already has init called, since it is too
          //late to modify them, and ignore unnormalized ones
          //since they are transient.
          if (!mod.inited && !mod.map.unnormalized) {
            mod.map = makeModuleMap(id, null, true);
          }
        });

        //If a deps array or a config callback is specified, then call
        //require with those args. This is useful when require is defined as a
        //config object before require.js is loaded.
        if (cfg.deps || cfg.callback) {
          context.require(cfg.deps || [], cfg.callback);
        }
      },

      makeShimExports: function (value) {
        function fn() {
          var ret;
          if (value.init) {
            ret = value.init.apply(global, arguments);
          }
          return ret || (value.exports && getGlobal(value.exports));
        }
        return fn;
      },

      makeRequire: function (relMap, options) {
        options = options || {};

        function localRequire(deps, callback, errback) {
          var id, map, requireMod;

          if (options.enableBuildCallback && callback && isFunction(callback)) {
            callback.__requireJsBuild = true;
          }

          if (typeof deps === 'string') {
            if (isFunction(callback)) {
              //Invalid call
              return onError(makeError('requireargs', 'Invalid require call'), errback);
            }

            //If require|exports|module are requested, get the
            //value for them from the special handlers. Caveat:
            //this only works while module is being defined.
            if (relMap && hasProp(handlers, deps)) {
              return handlers[deps](registry[relMap.id]);
            }

            //Synchronous access to one module. If require.get is
            //available (as in the Node adapter), prefer that.
            if (req.get) {
              return req.get(context, deps, relMap, localRequire);
            }

            //Normalize module name, if it contains . or ..
            map = makeModuleMap(deps, relMap, false, true);
            id = map.id;

            if (!hasProp(defined, id)) {
              return onError(makeError('notloaded', 'Module name "' +
                id +
                '" has not been loaded yet for context: ' +
                contextName +
                (relMap ? '' : '. Use require([])')));
            }
            return defined[id];
          }

          //Grab defines waiting in the global queue.
          intakeDefines();

          //Mark all the dependencies as needing to be loaded.
          context.nextTick(function () {
            //Some defines could have been added since the
            //require call, collect them.
            intakeDefines();

            requireMod = getModule(makeModuleMap(null, relMap));

            //Store if map config should be applied to this require
            //call for dependencies.
            requireMod.skipMap = options.skipMap;

            requireMod.init(deps, callback, errback, {
              enabled: true
            });

            checkLoaded();
          });

          return localRequire;
        }

        mixin(localRequire, {
          isBrowser: isBrowser,

          /**
           * Converts a module name + .extension into an URL path.
           * *Requires* the use of a module name. It does not support using
           * plain URLs like nameToUrl.
           */
          toUrl: function (moduleNamePlusExt) {
            var ext,
              index = moduleNamePlusExt.lastIndexOf('.'),
              segment = moduleNamePlusExt.split('/')[0],
              isRelative = segment === '.' || segment === '..';

            //Have a file extension alias, and it is not the
            //dots from a relative path.
            if (index !== -1 && (!isRelative || index > 1)) {
              ext = moduleNamePlusExt.substring(index, moduleNamePlusExt.length);
              moduleNamePlusExt = moduleNamePlusExt.substring(0, index);
            }

            return context.nameToUrl(normalize(moduleNamePlusExt,
              relMap && relMap.id, true), ext, true);
          },

          defined: function (id) {
            return hasProp(defined, makeModuleMap(id, relMap, false, true).id);
          },

          specified: function (id) {
            id = makeModuleMap(id, relMap, false, true).id;
            return hasProp(defined, id) || hasProp(registry, id);
          }
        });

        //Only allow undef on top level require calls
        if (!relMap) {
          localRequire.undef = function (id) {
            //Bind any waiting define() calls to this context,
            //fix for #408
            takeGlobalQueue();

            var map = makeModuleMap(id, relMap, true),
              mod = getOwn(registry, id);

            mod.undefed = true;
            removeScript(id);

            delete defined[id];
            delete urlFetched[map.url];
            delete undefEvents[id];

            //Clean queued defines too. Go backwards
            //in array so that the splices do not
            //mess up the iteration.
            eachReverse(defQueue, function (args, i) {
              if (args[0] === id) {
                defQueue.splice(i, 1);
              }
            });
            delete context.defQueueMap[id];

            if (mod) {
              //Hold on to listeners in case the
              //module will be attempted to be reloaded
              //using a different config.
              if (mod.events.defined) {
                undefEvents[id] = mod.events;
              }

              cleanRegistry(id);
            }
          };
        }

        return localRequire;
      },

      /**
       * Called to enable a module if it is still in the registry
       * awaiting enablement. A second arg, parent, the parent module,
       * is passed in for context, when this method is overridden by
       * the optimizer. Not shown here to keep code compact.
       */
      enable: function (depMap) {
        var mod = getOwn(registry, depMap.id);
        if (mod) {
          getModule(depMap).enable();
        }
      },

      /**
       * Internal method used by environment adapters to complete a load event.
       * A load event could be a script load or just a load pass from a synchronous
       * load call.
       * @param {String} moduleName the name of the module to potentially complete.
       */
      completeLoad: function (moduleName) {
        var found, args, mod,
          shim = getOwn(config.shim, moduleName) || {},
          shExports = shim.exports;

        takeGlobalQueue();

        while (defQueue.length) {
          args = defQueue.shift();
          if (args[0] === null) {
            args[0] = moduleName;
            //If already found an anonymous module and bound it
            //to this name, then this is some other anon module
            //waiting for its completeLoad to fire.
            if (found) {
              break;
            }
            found = true;
          } else if (args[0] === moduleName) {
            //Found matching define call for this script!
            found = true;
          }

          callGetModule(args);
        }
        context.defQueueMap = {};

        //Do this after the cycle of callGetModule in case the result
        //of those calls/init calls changes the registry.
        mod = getOwn(registry, moduleName);

        if (!found && !hasProp(defined, moduleName) && mod && !mod.inited) {
          if (config.enforceDefine && (!shExports || !getGlobal(shExports))) {
            if (hasPathFallback(moduleName)) {
              return;
            } else {
              return onError(makeError('nodefine',
                'No define call for ' + moduleName,
                null,
                [moduleName]));
            }
          } else {
            //A script that does not call define(), so just simulate
            //the call for it.
            callGetModule([moduleName, (shim.deps || []), shim.exportsFn]);
          }
        }

        checkLoaded();
      },

      /**
       * Converts a module name to a file path. Supports cases where
       * moduleName may actually be just an URL.
       * Note that it **does not** call normalize on the moduleName,
       * it is assumed to have already been normalized. This is an
       * internal API, not a public one. Use toUrl for the public API.
       */
      nameToUrl: function (moduleName, ext, skipExt) {
        var paths, syms, i, parentModule, url,
          parentPath, bundleId,
          pkgMain = getOwn(config.pkgs, moduleName);

        if (pkgMain) {
          moduleName = pkgMain;
        }

        bundleId = getOwn(bundlesMap, moduleName);

        if (bundleId) {
          return context.nameToUrl(bundleId, ext, skipExt);
        }

        //If a colon is in the URL, it indicates a protocol is used and it is just
        //an URL to a file, or if it starts with a slash, contains a query arg (i.e. ?)
        //or ends with .js, then assume the user meant to use an url and not a module id.
        //The slash is important for protocol-less URLs as well as full paths.
        if (req.jsExtRegExp.test(moduleName)) {
          //Just a plain path, not module name lookup, so just return it.
          //Add extension if it is included. This is a bit wonky, only non-.js things pass
          //an extension, this method probably needs to be reworked.
          url = moduleName + (ext || '');
        } else {
          //A module that needs to be converted to a path.
          paths = config.paths;

          syms = moduleName.split('/');
          //For each module name segment, see if there is a path
          //registered for it. Start with most specific name
          //and work up from it.
          for (i = syms.length; i > 0; i -= 1) {
            parentModule = syms.slice(0, i).join('/');

            parentPath = getOwn(paths, parentModule);
            if (parentPath) {
              //If an array, it means there are a few choices,
              //Choose the one that is desired
              if (isArray(parentPath)) {
                parentPath = parentPath[0];
              }
              syms.splice(0, i, parentPath);
              break;
            }
          }

          //Join the path parts together, then figure out if baseUrl is needed.
          url = syms.join('/');
          url += (ext || (/^data\:|^blob\:|\?/.test(url) || skipExt ? '' : '.js'));
          url = (url.charAt(0) === '/' || url.match(/^[\w\+\.\-]+:/) ? '' : config.baseUrl) + url;
        }

        return config.urlArgs && !/^blob\:/.test(url) ?
          url + config.urlArgs(moduleName, url) : url;
      },

      //Delegates to req.load. Broken out as a separate function to
      //allow overriding in the optimizer.
      load: function (id, url) {
        req.load(context, id, url);
      },

      /**
       * Executes a module callback function. Broken out as a separate function
       * solely to allow the build system to sequence the files in the built
       * layer in the right sequence.
       *
       * @private
       */
      execCb: function (name, callback, args, exports) {
        return callback.apply(exports, args);
      },

      /**
       * callback for script loads, used to check status of loading.
       *
       * @param {Event} evt the event from the browser for the script
       * that was loaded.
       */
      onScriptLoad: function (evt) {
        //Using currentTarget instead of target for Firefox 2.0's sake. Not
        //all old browsers will be supported, but this one was easy enough
        //to support and still makes sense.
        if (evt.type === 'load' ||
          (readyRegExp.test((evt.currentTarget || evt.srcElement).readyState))) {
          //Reset interactive script so a script node is not held onto for
          //to long.
          interactiveScript = null;

          //Pull out the name of the module and the context.
          var data = getScriptData(evt);
          context.completeLoad(data.id);
        }
      },

      /**
       * Callback for script errors.
       */
      onScriptError: function (evt) {
        var data = getScriptData(evt);
        if (!hasPathFallback(data.id)) {
          var parents = [];
          eachProp(registry, function (value, key) {
            if (key.indexOf('_@r') !== 0) {
              each(value.depMaps, function (depMap) {
                if (depMap.id === data.id) {
                  parents.push(key);
                  return true;
                }
              });
            }
          });
          return onError(makeError('scripterror', 'Script error for "' + data.id +
            (parents.length ?
              '", needed by: ' + parents.join(', ') :
              '"'), evt, [data.id]));
        }
      }
    };

    context.require = context.makeRequire();
    return context;
  }

  /**
   * Main entry point.
   *
   * If the only argument to require is a string, then the module that
   * is represented by that string is fetched for the appropriate context.
   *
   * If the first argument is an array, then it will be treated as an array
   * of dependency string names to fetch. An optional function callback can
   * be specified to execute when all of those dependencies are available.
   *
   * Make a local req variable to help Caja compliance (it assumes things
   * on a require that are not standardized), and to give a short
   * name for minification/local scope use.
   */
  req = requirejs = function (deps, callback, errback, optional) {

    //Find the right context, use default
    var context, config,
      contextName = defContextName;

    // Determine if have config object in the call.
    if (!isArray(deps) && typeof deps !== 'string') {
      // deps is a config object
      config = deps;
      if (isArray(callback)) {
        // Adjust args if there are dependencies
        deps = callback;
        callback = errback;
        errback = optional;
      } else {
        deps = [];
      }
    }

    if (config && config.context) {
      contextName = config.context;
    }

    context = getOwn(contexts, contextName);
    if (!context) {
      context = contexts[contextName] = req.s.newContext(contextName);
    }

    if (config) {
      context.configure(config);
    }

    return context.require(deps, callback, errback);
  };

  /**
   * Support require.config() to make it easier to cooperate with other
   * AMD loaders on globally agreed names.
   */
  req.config = function (config) {
    return req(config);
  };

  /**
   * Execute something after the current tick
   * of the event loop. Override for other envs
   * that have a better solution than setTimeout.
   * @param  {Function} fn function to execute later.
   */
  req.nextTick = typeof setTimeout !== 'undefined' ? function (fn) {
    setTimeout(fn, 4);
  } : function (fn) { fn(); };

  /**
   * Export require as a global, but only if it does not already exist.
   */
  if (!require) {
    require = req;
  }

  req.version = version;

  //Used to filter out dependencies that are already paths.
  req.jsExtRegExp = /^\/|:|\?|\.js$/;
  req.isBrowser = isBrowser;
  s = req.s = {
    contexts: contexts,
    newContext: newContext
  };

  //Create default context.
  req({});

  //Exports some context-sensitive methods on global require.
  each([
    'toUrl',
    'undef',
    'defined',
    'specified'
  ], function (prop) {
    //Reference from contexts instead of early binding to default context,
    //so that during builds, the latest instance of the default context
    //with its config gets used.
    req[prop] = function () {
      var ctx = contexts[defContextName];
      return ctx.require[prop].apply(ctx, arguments);
    };
  });

  if (isBrowser) {
    head = s.head = document.getElementsByTagName('head')[0];
    //If BASE tag is in play, using appendChild is a problem for IE6.
    //When that browser dies, this can be removed. Details in this jQuery bug:
    //http://dev.jquery.com/ticket/2709
    baseElement = document.getElementsByTagName('base')[0];
    if (baseElement) {
      head = s.head = baseElement.parentNode;
    }
  }

  /**
   * Any errors that require explicitly generates will be passed to this
   * function. Intercept/override it if you want custom error handling.
   * @param {Error} err the error object.
   */
  req.onError = defaultOnError;

  /**
   * Creates the node for the load command. Only used in browser envs.
   */
  req.createNode = function (config, moduleName, url) {
    var node = config.xhtml ?
      document.createElementNS('http://www.w3.org/1999/xhtml', 'html:script') :
      document.createElement('script');
    node.type = config.scriptType || 'text/javascript';
    node.charset = 'utf-8';
    node.async = true;
    return node;
  };

  /**
   * Does the request to load a module for the browser case.
   * Make this a separate function to allow other environments
   * to override it.
   *
   * @param {Object} context the require context to find state.
   * @param {String} moduleName the name of the module.
   * @param {Object} url the URL to the module.
   */
  req.load = function (context, moduleName, url) {
    var config = (context && context.config) || {},
      node;
    if (isBrowser) {
      //In the browser so use a script tag
      node = req.createNode(config, moduleName, url);

      node.setAttribute('data-requirecontext', context.contextName);
      node.setAttribute('data-requiremodule', moduleName);

      //Set up load listener. Test attachEvent first because IE9 has
      //a subtle issue in its addEventListener and script onload firings
      //that do not match the behavior of all other browsers with
      //addEventListener support, which fire the onload event for a
      //script right after the script execution. See:
      //https://connect.microsoft.com/IE/feedback/details/648057/script-onload-event-is-not-fired-immediately-after-script-execution
      //UNFORTUNATELY Opera implements attachEvent but does not follow the script
      //script execution mode.
      if (node.attachEvent &&
        //Check if node.attachEvent is artificially added by custom script or
        //natively supported by browser
        //read https://github.com/requirejs/requirejs/issues/187
        //if we can NOT find [native code] then it must NOT natively supported.
        //in IE8, node.attachEvent does not have toString()
        //Note the test for "[native code" with no closing brace, see:
        //https://github.com/requirejs/requirejs/issues/273
        !(node.attachEvent.toString && node.attachEvent.toString().indexOf('[native code') < 0) &&
        !isOpera) {
        //Probably IE. IE (at least 6-8) do not fire
        //script onload right after executing the script, so
        //we cannot tie the anonymous define call to a name.
        //However, IE reports the script as being in 'interactive'
        //readyState at the time of the define call.
        useInteractive = true;

        node.attachEvent('onreadystatechange', context.onScriptLoad);
        //It would be great to add an error handler here to catch
        //404s in IE9+. However, onreadystatechange will fire before
        //the error handler, so that does not help. If addEventListener
        //is used, then IE will fire error before load, but we cannot
        //use that pathway given the connect.microsoft.com issue
        //mentioned above about not doing the 'script execute,
        //then fire the script load event listener before execute
        //next script' that other browsers do.
        //Best hope: IE10 fixes the issues,
        //and then destroys all installs of IE 6-9.
        //node.attachEvent('onerror', context.onScriptError);
      } else {
        node.addEventListener('load', context.onScriptLoad, false);
        node.addEventListener('error', context.onScriptError, false);
      }
      node.src = url;

      //Calling onNodeCreated after all properties on the node have been
      //set, but before it is placed in the DOM.
      if (config.onNodeCreated) {
        config.onNodeCreated(node, config, moduleName, url);
      }

      //For some cache cases in IE 6-8, the script executes before the end
      //of the appendChild execution, so to tie an anonymous define
      //call to the module name (which is stored on the node), hold on
      //to a reference to this node, but clear after the DOM insertion.
      currentlyAddingScript = node;
      if (baseElement) {
        head.insertBefore(node, baseElement);
      } else {
        head.appendChild(node);
      }
      currentlyAddingScript = null;

      return node;
    } else if (isWebWorker) {
      try {
        //In a web worker, use importScripts. This is not a very
        //efficient use of importScripts, importScripts will block until
        //its script is downloaded and evaluated. However, if web workers
        //are in play, the expectation is that a build has been done so
        //that only one script needs to be loaded anyway. This may need
        //to be reevaluated if other use cases become common.

        // Post a task to the event loop to work around a bug in WebKit
        // where the worker gets garbage-collected after calling
        // importScripts(): https://webkit.org/b/153317
        setTimeout(function () { }, 0);
        importScripts(url);

        //Account for anonymous modules
        context.completeLoad(moduleName);
      } catch (e) {
        context.onError(makeError('importscripts',
          'importScripts failed for ' +
          moduleName + ' at ' + url,
          e,
          [moduleName]));
      }
    }
  };

  function getInteractiveScript() {
    if (interactiveScript && interactiveScript.readyState === 'interactive') {
      return interactiveScript;
    }

    eachReverse(scripts(), function (script) {
      if (script.readyState === 'interactive') {
        return (interactiveScript = script);
      }
    });
    return interactiveScript;
  }

  //Look for a data-main script attribute, which could also adjust the baseUrl.
  if (isBrowser && !cfg.skipDataMain) {
    //Figure out baseUrl. Get it from the script tag with require.js in it.
    eachReverse(scripts(), function (script) {
      //Set the 'head' where we can append children by
      //using the script's parent.
      if (!head) {
        head = script.parentNode;
      }

      //Look for a data-main attribute to set main script for the page
      //to load. If it is there, the path to data main becomes the
      //baseUrl, if it is not already set.
      dataMain = script.getAttribute('data-main');
      if (dataMain) {
        //Preserve dataMain in case it is a path (i.e. contains '?')
        mainScript = dataMain;

        //Set final baseUrl if there is not already an explicit one,
        //but only do so if the data-main value is not a loader plugin
        //module ID.
        if (!cfg.baseUrl && mainScript.indexOf('!') === -1) {
          //Pull off the directory of data-main for use as the
          //baseUrl.
          src = mainScript.split('/');
          mainScript = src.pop();
          subPath = src.length ? src.join('/') + '/' : './';

          cfg.baseUrl = subPath;
        }

        //Strip off any trailing .js since mainScript is now
        //like a module name.
        mainScript = mainScript.replace(jsSuffixRegExp, '');

        //If mainScript is still a path, fall back to dataMain
        if (req.jsExtRegExp.test(mainScript)) {
          mainScript = dataMain;
        }

        //Put the data-main script in the files to load.
        cfg.deps = cfg.deps ? cfg.deps.concat(mainScript) : [mainScript];

        return true;
      }
    });
  }

  /**
   * The function that handles definitions of modules. Differs from
   * require() in that a string for the module should be the first argument,
   * and the function to execute after dependencies are loaded should
   * return a value to define the module corresponding to the first argument's
   * name.
   */
  define = function (name, deps, callback) {
    var node, context;

    //Allow for anonymous modules
    if (typeof name !== 'string') {
      //Adjust args appropriately
      callback = deps;
      deps = name;
      name = null;
    }

    //This module may not have dependencies
    if (!isArray(deps)) {
      callback = deps;
      deps = null;
    }

    //If no name, and callback is a function, then figure out if it a
    //CommonJS thing with dependencies.
    if (!deps && isFunction(callback)) {
      deps = [];
      //Remove comments from the callback string,
      //look for require calls, and pull them into the dependencies,
      //but only if there are function args.
      if (callback.length) {
        callback
          .toString()
          .replace(commentRegExp, commentReplace)
          .replace(cjsRequireRegExp, function (match, dep) {
            deps.push(dep);
          });

        //May be a CommonJS thing even without require calls, but still
        //could use exports, and module. Avoid doing exports and module
        //work though if it just needs require.
        //REQUIRES the function to expect the CommonJS variables in the
        //order listed below.
        deps = (callback.length === 1 ? ['require'] : ['require', 'exports', 'module']).concat(deps);
      }
    }

    //If in IE 6-8 and hit an anonymous define() call, do the interactive
    //work.
    if (useInteractive) {
      node = currentlyAddingScript || getInteractiveScript();
      if (node) {
        if (!name) {
          name = node.getAttribute('data-requiremodule');
        }
        context = contexts[node.getAttribute('data-requirecontext')];
      }
    }

    //Always save off evaluating the def call until the script onload handler.
    //This allows multiple modules to be in a file without prematurely
    //tracing dependencies, and allows for anonymous module support,
    //where the module name is not known until the script onload event
    //occurs. If no context, use the global queue, and get it processed
    //in the onscript load callback.
    if (context) {
      context.defQueue.push([name, deps, callback]);
      context.defQueueMap[name] = true;
    } else {
      globalDefQueue.push([name, deps, callback]);
    }
  };

  define.amd = {
    jQuery: true
  };

  /**
   * Executes the text. Normally just uses eval, but can be modified
   * to use a better, environment-specific call. Only used for transpiling
   * loader plugins, not for plain JS modules.
   * @param {String} text the text to execute/evaluate.
   */
  req.exec = function (text) {
    /*jslint evil: true */
    return eval(text);
  };

  //Set up with config info.
  req(cfg);

  return {
    requirejs, require, define
  }
}