初始化

uni_modules/UniDevTools/node_modules/systemjs/dist/s.js

@@ -0,0 +1,739 @@
+/*!
+ * SJS 6.14.1
+ */
+(function () {
+
+  function errMsg(errCode, msg) {
+    return (msg || "") + " (SystemJS https://github.com/systemjs/systemjs/blob/main/docs/errors.md#" + errCode + ")";
+  }
+
+  var hasSymbol = typeof Symbol !== 'undefined';
+  var hasSelf = typeof self !== 'undefined';
+  var hasDocument = typeof document !== 'undefined';
+
+  var envGlobal = hasSelf ? self : global;
+
+  var baseUrl;
+
+  if (hasDocument) {
+    var baseEl = document.querySelector('base[href]');
+    if (baseEl)
+      baseUrl = baseEl.href;
+  }
+
+  if (!baseUrl && typeof location !== 'undefined') {
+    baseUrl = location.href.split('#')[0].split('?')[0];
+    var lastSepIndex = baseUrl.lastIndexOf('/');
+    if (lastSepIndex !== -1)
+      baseUrl = baseUrl.slice(0, lastSepIndex + 1);
+  }
+
+  var backslashRegEx = /\\/g;
+  function resolveIfNotPlainOrUrl (relUrl, parentUrl) {
+    if (relUrl.indexOf('\\') !== -1)
+      relUrl = relUrl.replace(backslashRegEx, '/');
+    // protocol-relative
+    if (relUrl[0] === '/' && relUrl[1] === '/') {
+      return parentUrl.slice(0, parentUrl.indexOf(':') + 1) + relUrl;
+    }
+    // relative-url
+    else if (relUrl[0] === '.' && (relUrl[1] === '/' || relUrl[1] === '.' && (relUrl[2] === '/' || relUrl.length === 2 && (relUrl += '/')) ||
+        relUrl.length === 1  && (relUrl += '/')) ||
+        relUrl[0] === '/') {
+      var parentProtocol = parentUrl.slice(0, parentUrl.indexOf(':') + 1);
+      // Disabled, but these cases will give inconsistent results for deep backtracking
+      //if (parentUrl[parentProtocol.length] !== '/')
+      //  throw Error('Cannot resolve');
+      // read pathname from parent URL
+      // pathname taken to be part after leading "/"
+      var pathname;
+      if (parentUrl[parentProtocol.length + 1] === '/') {
+        // resolving to a :// so we need to read out the auth and host
+        if (parentProtocol !== 'file:') {
+          pathname = parentUrl.slice(parentProtocol.length + 2);
+          pathname = pathname.slice(pathname.indexOf('/') + 1);
+        }
+        else {
+          pathname = parentUrl.slice(8);
+        }
+      }
+      else {
+        // resolving to :/ so pathname is the /... part
+        pathname = parentUrl.slice(parentProtocol.length + (parentUrl[parentProtocol.length] === '/'));
+      }
+
+      if (relUrl[0] === '/')
+        return parentUrl.slice(0, parentUrl.length - pathname.length - 1) + relUrl;
+
+      // join together and split for removal of .. and . segments
+      // looping the string instead of anything fancy for perf reasons
+      // '../../../../../z' resolved to 'x/y' is just 'z'
+      var segmented = pathname.slice(0, pathname.lastIndexOf('/') + 1) + relUrl;
+
+      var output = [];
+      var segmentIndex = -1;
+      for (var i = 0; i < segmented.length; i++) {
+        // busy reading a segment - only terminate on '/'
+        if (segmentIndex !== -1) {
+          if (segmented[i] === '/') {
+            output.push(segmented.slice(segmentIndex, i + 1));
+            segmentIndex = -1;
+          }
+        }
+
+        // new segment - check if it is relative
+        else if (segmented[i] === '.') {
+          // ../ segment
+          if (segmented[i + 1] === '.' && (segmented[i + 2] === '/' || i + 2 === segmented.length)) {
+            output.pop();
+            i += 2;
+          }
+          // ./ segment
+          else if (segmented[i + 1] === '/' || i + 1 === segmented.length) {
+            i += 1;
+          }
+          else {
+            // the start of a new segment as below
+            segmentIndex = i;
+          }
+        }
+        // it is the start of a new segment
+        else {
+          segmentIndex = i;
+        }
+      }
+      // finish reading out the last segment
+      if (segmentIndex !== -1)
+        output.push(segmented.slice(segmentIndex));
+      return parentUrl.slice(0, parentUrl.length - pathname.length) + output.join('');
+    }
+  }
+
+  /*
+   * Import maps implementation
+   *
+   * To make lookups fast we pre-resolve the entire import map
+   * and then match based on backtracked hash lookups
+   *
+   */
+
+  function resolveUrl (relUrl, parentUrl) {
+    return resolveIfNotPlainOrUrl(relUrl, parentUrl) || (relUrl.indexOf(':') !== -1 ? relUrl : resolveIfNotPlainOrUrl('./' + relUrl, parentUrl));
+  }
+
+  function resolveAndComposePackages (packages, outPackages, baseUrl, parentMap, parentUrl) {
+    for (var p in packages) {
+      var resolvedLhs = resolveIfNotPlainOrUrl(p, baseUrl) || p;
+      var rhs = packages[p];
+      // package fallbacks not currently supported
+      if (typeof rhs !== 'string')
+        continue;
+      var mapped = resolveImportMap(parentMap, resolveIfNotPlainOrUrl(rhs, baseUrl) || rhs, parentUrl);
+      if (!mapped) {
+        targetWarning('W1', p, rhs);
+      }
+      else
+        outPackages[resolvedLhs] = mapped;
+    }
+  }
+
+  function resolveAndComposeImportMap (json, baseUrl, outMap) {
+    if (json.imports)
+      resolveAndComposePackages(json.imports, outMap.imports, baseUrl, outMap, null);
+
+    var u;
+    for (u in json.scopes || {}) {
+      var resolvedScope = resolveUrl(u, baseUrl);
+      resolveAndComposePackages(json.scopes[u], outMap.scopes[resolvedScope] || (outMap.scopes[resolvedScope] = {}), baseUrl, outMap, resolvedScope);
+    }
+
+    for (u in json.depcache || {})
+      outMap.depcache[resolveUrl(u, baseUrl)] = json.depcache[u];
+    
+    for (u in json.integrity || {})
+      outMap.integrity[resolveUrl(u, baseUrl)] = json.integrity[u];
+  }
+
+  function getMatch (path, matchObj) {
+    if (matchObj[path])
+      return path;
+    var sepIndex = path.length;
+    do {
+      var segment = path.slice(0, sepIndex + 1);
+      if (segment in matchObj)
+        return segment;
+    } while ((sepIndex = path.lastIndexOf('/', sepIndex - 1)) !== -1)
+  }
+
+  function applyPackages (id, packages) {
+    var pkgName = getMatch(id, packages);
+    if (pkgName) {
+      var pkg = packages[pkgName];
+      if (pkg === null) return;
+      if (id.length > pkgName.length && pkg[pkg.length - 1] !== '/') {
+        targetWarning('W2', pkgName, pkg);
+      }
+      else
+        return pkg + id.slice(pkgName.length);
+    }
+  }
+
+  function targetWarning (code, match, target, msg) {
+    console.warn(errMsg(code, [target, match].join(', ') ));
+  }
+
+  function resolveImportMap (importMap, resolvedOrPlain, parentUrl) {
+    var scopes = importMap.scopes;
+    var scopeUrl = parentUrl && getMatch(parentUrl, scopes);
+    while (scopeUrl) {
+      var packageResolution = applyPackages(resolvedOrPlain, scopes[scopeUrl]);
+      if (packageResolution)
+        return packageResolution;
+      scopeUrl = getMatch(scopeUrl.slice(0, scopeUrl.lastIndexOf('/')), scopes);
+    }
+    return applyPackages(resolvedOrPlain, importMap.imports) || resolvedOrPlain.indexOf(':') !== -1 && resolvedOrPlain;
+  }
+
+  /*
+   * SystemJS Core
+   *
+   * Provides
+   * - System.import
+   * - System.register support for
+   *     live bindings, function hoisting through circular references,
+   *     reexports, dynamic import, import.meta.url, top-level await
+   * - System.getRegister to get the registration
+   * - Symbol.toStringTag support in Module objects
+   * - Hookable System.createContext to customize import.meta
+   * - System.onload(err, id, deps) handler for tracing / hot-reloading
+   *
+   * Core comes with no System.prototype.resolve or
+   * System.prototype.instantiate implementations
+   */
+
+  var toStringTag = hasSymbol && Symbol.toStringTag;
+  var REGISTRY = hasSymbol ? Symbol() : '@';
+
+  function SystemJS () {
+    this[REGISTRY] = {};
+  }
+
+  var systemJSPrototype = SystemJS.prototype;
+
+  systemJSPrototype.import = function (id, parentUrl, meta) {
+    var loader = this;
+    (parentUrl && typeof parentUrl === 'object') && (meta = parentUrl, parentUrl = undefined);
+    return Promise.resolve(loader.prepareImport())
+    .then(function() {
+      return loader.resolve(id, parentUrl, meta);
+    })
+    .then(function (id) {
+      var load = getOrCreateLoad(loader, id, undefined, meta);
+      return load.C || topLevelLoad(loader, load);
+    });
+  };
+
+  // Hookable createContext function -> allowing eg custom import meta
+  systemJSPrototype.createContext = function (parentId) {
+    var loader = this;
+    return {
+      url: parentId,
+      resolve: function (id, parentUrl) {
+        return Promise.resolve(loader.resolve(id, parentUrl || parentId));
+      }
+    };
+  };
+  function loadToId (load) {
+    return load.id;
+  }
+  function triggerOnload (loader, load, err, isErrSource) {
+    loader.onload(err, load.id, load.d && load.d.map(loadToId), !!isErrSource);
+    if (err)
+      throw err;
+  }
+
+  var lastRegister;
+  systemJSPrototype.register = function (deps, declare, metas) {
+    lastRegister = [deps, declare, metas];
+  };
+
+  /*
+   * getRegister provides the last anonymous System.register call
+   */
+  systemJSPrototype.getRegister = function () {
+    var _lastRegister = lastRegister;
+    lastRegister = undefined;
+    return _lastRegister;
+  };
+
+  function getOrCreateLoad (loader, id, firstParentUrl, meta) {
+    var load = loader[REGISTRY][id];
+    if (load)
+      return load;
+
+    var importerSetters = [];
+    var ns = Object.create(null);
+    if (toStringTag)
+      Object.defineProperty(ns, toStringTag, { value: 'Module' });
+
+    var instantiatePromise = Promise.resolve()
+    .then(function () {
+      return loader.instantiate(id, firstParentUrl, meta);
+    })
+    .then(function (registration) {
+      if (!registration)
+        throw Error(errMsg(2, id ));
+      function _export (name, value) {
+        // note if we have hoisted exports (including reexports)
+        load.h = true;
+        var changed = false;
+        if (typeof name === 'string') {
+          if (!(name in ns) || ns[name] !== value) {
+            ns[name] = value;
+            changed = true;
+          }
+        }
+        else {
+          for (var p in name) {
+            var value = name[p];
+            if (!(p in ns) || ns[p] !== value) {
+              ns[p] = value;
+              changed = true;
+            }
+          }
+
+          if (name && name.__esModule) {
+            ns.__esModule = name.__esModule;
+          }
+        }
+        if (changed)
+          for (var i = 0; i < importerSetters.length; i++) {
+            var setter = importerSetters[i];
+            if (setter) setter(ns);
+          }
+        return value;
+      }
+      var declared = registration[1](_export, registration[1].length === 2 ? {
+        import: function (importId, meta) {
+          return loader.import(importId, id, meta);
+        },
+        meta: loader.createContext(id)
+      } : undefined);
+      load.e = declared.execute || function () {};
+      return [registration[0], declared.setters || [], registration[2] || []];
+    }, function (err) {
+      load.e = null;
+      load.er = err;
+      throw err;
+    });
+
+    var linkPromise = instantiatePromise
+    .then(function (instantiation) {
+      return Promise.all(instantiation[0].map(function (dep, i) {
+        var setter = instantiation[1][i];
+        var meta = instantiation[2][i];
+        return Promise.resolve(loader.resolve(dep, id))
+        .then(function (depId) {
+          var depLoad = getOrCreateLoad(loader, depId, id, meta);
+          // depLoad.I may be undefined for already-evaluated
+          return Promise.resolve(depLoad.I)
+          .then(function () {
+            if (setter) {
+              depLoad.i.push(setter);
+              // only run early setters when there are hoisted exports of that module
+              // the timing works here as pending hoisted export calls will trigger through importerSetters
+              if (depLoad.h || !depLoad.I)
+                setter(depLoad.n);
+            }
+            return depLoad;
+          });
+        });
+      }))
+      .then(function (depLoads) {
+        load.d = depLoads;
+      });
+    });
+
+    // Capital letter = a promise function
+    return load = loader[REGISTRY][id] = {
+      id: id,
+      // importerSetters, the setters functions registered to this dependency
+      // we retain this to add more later
+      i: importerSetters,
+      // module namespace object
+      n: ns,
+      // extra module information for import assertion
+      // shape like: { assert: { type: 'xyz' } }
+      m: meta,
+
+      // instantiate
+      I: instantiatePromise,
+      // link
+      L: linkPromise,
+      // whether it has hoisted exports
+      h: false,
+
+      // On instantiate completion we have populated:
+      // dependency load records
+      d: undefined,
+      // execution function
+      e: undefined,
+
+      // On execution we have populated:
+      // the execution error if any
+      er: undefined,
+      // in the case of TLA, the execution promise
+      E: undefined,
+
+      // On execution, L, I, E cleared
+
+      // Promise for top-level completion
+      C: undefined,
+
+      // parent instantiator / executor
+      p: undefined
+    };
+  }
+
+  function instantiateAll (loader, load, parent, loaded) {
+    if (!loaded[load.id]) {
+      loaded[load.id] = true;
+      // load.L may be undefined for already-instantiated
+      return Promise.resolve(load.L)
+      .then(function () {
+        if (!load.p || load.p.e === null)
+          load.p = parent;
+        return Promise.all(load.d.map(function (dep) {
+          return instantiateAll(loader, dep, parent, loaded);
+        }));
+      })
+      .catch(function (err) {
+        if (load.er)
+          throw err;
+        load.e = null;
+        throw err;
+      });
+    }
+  }
+
+  function topLevelLoad (loader, load) {
+    return load.C = instantiateAll(loader, load, load, {})
+    .then(function () {
+      return postOrderExec(loader, load, {});
+    })
+    .then(function () {
+      return load.n;
+    });
+  }
+
+  // the closest we can get to call(undefined)
+  var nullContext = Object.freeze(Object.create(null));
+
+  // returns a promise if and only if a top-level await subgraph
+  // throws on sync errors
+  function postOrderExec (loader, load, seen) {
+    if (seen[load.id])
+      return;
+    seen[load.id] = true;
+
+    if (!load.e) {
+      if (load.er)
+        throw load.er;
+      if (load.E)
+        return load.E;
+      return;
+    }
+
+    // From here we're about to execute the load.
+    // Because the execution may be async, we pop the `load.e` first.
+    // So `load.e === null` always means the load has been executed or is executing.
+    // To inspect the state:
+    // - If `load.er` is truthy, the execution has threw or has been rejected;
+    // - otherwise, either the `load.E` is a promise, means it's under async execution, or
+    // - the `load.E` is null, means the load has completed the execution or has been async resolved.
+    var exec = load.e;
+    load.e = null;
+
+    // deps execute first, unless circular
+    var depLoadPromises;
+    load.d.forEach(function (depLoad) {
+      try {
+        var depLoadPromise = postOrderExec(loader, depLoad, seen);
+        if (depLoadPromise)
+          (depLoadPromises = depLoadPromises || []).push(depLoadPromise);
+      }
+      catch (err) {
+        load.er = err;
+        throw err;
+      }
+    });
+    if (depLoadPromises)
+      return Promise.all(depLoadPromises).then(doExec);
+
+    return doExec();
+
+    function doExec () {
+      try {
+        var execPromise = exec.call(nullContext);
+        if (execPromise) {
+          execPromise = execPromise.then(function () {
+            load.C = load.n;
+            load.E = null; // indicates completion
+            if (!true) ;
+          }, function (err) {
+            load.er = err;
+            load.E = null;
+            if (!true) ;
+            throw err;
+          });
+          return load.E = execPromise;
+        }
+        // (should be a promise, but a minify optimization to leave out Promise.resolve)
+        load.C = load.n;
+        load.L = load.I = undefined;
+      }
+      catch (err) {
+        load.er = err;
+        throw err;
+      }
+      finally {
+      }
+    }
+  }
+
+  envGlobal.System = new SystemJS();
+
+  /*
+   * SystemJS browser attachments for script and import map processing
+   */
+
+  var importMapPromise = Promise.resolve();
+  var importMap = { imports: {}, scopes: {}, depcache: {}, integrity: {} };
+
+  // Scripts are processed immediately, on the first System.import, and on DOMReady.
+  // Import map scripts are processed only once (by being marked) and in order for each phase.
+  // This is to avoid using DOM mutation observers in core, although that would be an alternative.
+  var processFirst = hasDocument;
+  systemJSPrototype.prepareImport = function (doProcessScripts) {
+    if (processFirst || doProcessScripts) {
+      processScripts();
+      processFirst = false;
+    }
+    return importMapPromise;
+  };
+  if (hasDocument) {
+    processScripts();
+    window.addEventListener('DOMContentLoaded', processScripts);
+  }
+  systemJSPrototype.addImportMap = function (newMap, mapBase) {
+    resolveAndComposeImportMap(newMap, mapBase || baseUrl, importMap);
+  };
+
+  function processScripts () {
+    [].forEach.call(document.querySelectorAll('script'), function (script) {
+      if (script.sp) // sp marker = systemjs processed
+        return;
+      // TODO: deprecate systemjs-module in next major now that we have auto import
+      if (script.type === 'systemjs-module') {
+        script.sp = true;
+        if (!script.src)
+          return;
+        System.import(script.src.slice(0, 7) === 'import:' ? script.src.slice(7) : resolveUrl(script.src, baseUrl)).catch(function (e) {
+          // if there is a script load error, dispatch an "error" event
+          // on the script tag.
+          if (e.message.indexOf('https://github.com/systemjs/systemjs/blob/main/docs/errors.md#3') > -1) {
+            var event = document.createEvent('Event');
+            event.initEvent('error', false, false);
+            script.dispatchEvent(event);
+          }
+          return Promise.reject(e);
+        });
+      }
+      else if (script.type === 'systemjs-importmap') {
+        script.sp = true;
+        // The passThrough property is for letting the module types fetch implementation know that this is not a SystemJS module.
+        var fetchPromise = script.src ? (System.fetch || fetch)(script.src, { integrity: script.integrity, passThrough: true }).then(function (res) {
+          if (!res.ok)
+            throw Error(res.status );
+          return res.text();
+        }).catch(function (err) {
+          err.message = errMsg('W4', script.src ) + '\n' + err.message;
+          console.warn(err);
+          if (typeof script.onerror === 'function') {
+              script.onerror();
+          }
+          return '{}';
+        }) : script.innerHTML;
+        importMapPromise = importMapPromise.then(function () {
+          return fetchPromise;
+        }).then(function (text) {
+          extendImportMap(importMap, text, script.src || baseUrl);
+        });
+      }
+    });
+  }
+
+  function extendImportMap (importMap, newMapText, newMapUrl) {
+    var newMap = {};
+    try {
+      newMap = JSON.parse(newMapText);
+    } catch (err) {
+      console.warn(Error((errMsg('W5')  )));
+    }
+    resolveAndComposeImportMap(newMap, newMapUrl, importMap);
+  }
+
+  /*
+   * Script instantiation loading
+   */
+
+  if (hasDocument) {
+    window.addEventListener('error', function (evt) {
+      lastWindowErrorUrl = evt.filename;
+      lastWindowError = evt.error;
+    });
+    var baseOrigin = location.origin;
+  }
+
+  systemJSPrototype.createScript = function (url) {
+    var script = document.createElement('script');
+    script.async = true;
+    // Only add cross origin for actual cross origin
+    // this is because Safari triggers for all
+    // - https://bugs.webkit.org/show_bug.cgi?id=171566
+    if (url.indexOf(baseOrigin + '/'))
+      script.crossOrigin = 'anonymous';
+    var integrity = importMap.integrity[url];
+    if (integrity)
+      script.integrity = integrity;
+    script.src = url;
+    return script;
+  };
+
+  // Auto imports -> script tags can be inlined directly for load phase
+  var lastAutoImportDeps, lastAutoImportTimeout;
+  var autoImportCandidates = {};
+  var systemRegister = systemJSPrototype.register;
+  systemJSPrototype.register = function (deps, declare) {
+    if (hasDocument && document.readyState === 'loading' && typeof deps !== 'string') {
+      var scripts = document.querySelectorAll('script[src]');
+      var lastScript = scripts[scripts.length - 1];
+      if (lastScript) {
+        lastScript.src;
+        lastAutoImportDeps = deps;
+        // if this is already a System load, then the instantiate has already begun
+        // so this re-import has no consequence
+        var loader = this;
+        lastAutoImportTimeout = setTimeout(function () {
+          autoImportCandidates[lastScript.src] = [deps, declare];
+          loader.import(lastScript.src);
+        });
+      }
+    }
+    else {
+      lastAutoImportDeps = undefined;
+    }
+    return systemRegister.call(this, deps, declare);
+  };
+
+  var lastWindowErrorUrl, lastWindowError;
+  systemJSPrototype.instantiate = function (url, firstParentUrl) {
+    var autoImportRegistration = autoImportCandidates[url];
+    if (autoImportRegistration) {
+      delete autoImportCandidates[url];
+      return autoImportRegistration;
+    }
+    var loader = this;
+    return Promise.resolve(systemJSPrototype.createScript(url)).then(function (script) {
+      return new Promise(function (resolve, reject) {
+        script.addEventListener('error', function () {
+          reject(Error(errMsg(3, [url, firstParentUrl].join(', ') )));
+        });
+        script.addEventListener('load', function () {
+          document.head.removeChild(script);
+          // Note that if an error occurs that isn't caught by this if statement,
+          // that getRegister will return null and a "did not instantiate" error will be thrown.
+          if (lastWindowErrorUrl === url) {
+            reject(lastWindowError);
+          }
+          else {
+            var register = loader.getRegister(url);
+            // Clear any auto import registration for dynamic import scripts during load
+            if (register && register[0] === lastAutoImportDeps)
+              clearTimeout(lastAutoImportTimeout);
+            resolve(register);
+          }
+        });
+        document.head.appendChild(script);
+      });
+    });
+  };
+
+  /*
+   * Fetch loader, sets up shouldFetch and fetch hooks
+   */
+  systemJSPrototype.shouldFetch = function () {
+    return false;
+  };
+  if (typeof fetch !== 'undefined')
+    systemJSPrototype.fetch = fetch;
+
+  var instantiate = systemJSPrototype.instantiate;
+  var jsContentTypeRegEx = /^(text|application)\/(x-)?javascript(;|$)/;
+  systemJSPrototype.instantiate = function (url, parent, meta) {
+    var loader = this;
+    if (!this.shouldFetch(url, parent, meta))
+      return instantiate.apply(this, arguments);
+    return this.fetch(url, {
+      credentials: 'same-origin',
+      integrity: importMap.integrity[url],
+      meta: meta,
+    })
+    .then(function (res) {
+      if (!res.ok)
+        throw Error(errMsg(7, [res.status, res.statusText, url, parent].join(', ') ));
+      var contentType = res.headers.get('content-type');
+      if (!contentType || !jsContentTypeRegEx.test(contentType))
+        throw Error(errMsg(4, contentType ));
+      return res.text().then(function (source) {
+        if (source.indexOf('//# sourceURL=') < 0)
+          source += '\n//# sourceURL=' + url;
+        (0, eval)(source);
+        return loader.getRegister(url);
+      });
+    });
+  };
+
+  systemJSPrototype.resolve = function (id, parentUrl) {
+    parentUrl = parentUrl || !true  || baseUrl;
+    return resolveImportMap((importMap), resolveIfNotPlainOrUrl(id, parentUrl) || id, parentUrl) || throwUnresolved(id, parentUrl);
+  };
+
+  function throwUnresolved (id, parentUrl) {
+    throw Error(errMsg(8, [id, parentUrl].join(', ') ));
+  }
+
+  var systemInstantiate = systemJSPrototype.instantiate;
+  systemJSPrototype.instantiate = function (url, firstParentUrl, meta) {
+    var preloads = (importMap).depcache[url];
+    if (preloads) {
+      for (var i = 0; i < preloads.length; i++)
+        getOrCreateLoad(this, this.resolve(preloads[i], url), url);
+    }
+    return systemInstantiate.call(this, url, firstParentUrl, meta);
+  };
+
+  /*
+   * Supports loading System.register in workers
+   */
+
+  if (hasSelf && typeof importScripts === 'function')
+    systemJSPrototype.instantiate = function (url) {
+      var loader = this;
+      return Promise.resolve().then(function () {
+        importScripts(url);
+        return loader.getRegister(url);
+      });
+    };
+
+})();