systemjs - npm Package Compare versions

Comparing version 6.3.3 to 6.4.0

CHANGELOG.md

@@ -0,1 +1,8 @@
+SystemJS 6.4.0
+* Dynamic import map extra support (https://github.com/systemjs/systemjs/pull/2217 @stevenvachon)
+* Depcache support in import maps for automated preloading (https://github.com/systemjs/systemjs/pull/2134)
+* Auto Import feature for `<script src="system-register-module.js">` loading for better load performance (https://github.com/systemjs/systemjs/pull/2216, https://github.com/systemjs/systemjs/pull/2210 @tmsns)
+* Fix onload behaviour with flag for error source (https://github.com/systemjs/systemjs/pull/2204 @smartrejames)
+* Fix Object.prototype mutation (https://github.com/systemjs/systemjs/pull/2206 @stevenvachon)
+
 SystemJS 6.3.3
@@ -2,0 +9,0 @@ * Better error message when content-type header is missing (https://github.com/systemjs/systemjs/pull/2197 via @brandones)

dist/extras/global.js

@@ -7,3 +7,3 @@ (function(){/*
 (function (global) {
-  var systemJSPrototype = System.constructor.prototype;
+  var systemJSPrototype = global.System.constructor.prototype;
 
@@ -10,0 +10,0 @@ // safari unpredictably lists some new globals first or second in object order

dist/extras/global.min.js

@@ -1,1 +0,1 @@
-!function(n){function t(t){return!n.hasOwnProperty(t)||!isNaN(t)&&n.length>t||c&&n[t]&&"undefined"!=typeof window&&n[t].parent===window}var r,e,i,u=System.constructor.prototype,f=u.import;u.import=function(u,o){return function(){for(var u in r=e=void 0,n)t(u)||(r?e||(e=u):r=u,i=u)}(),f.call(this,u,o)};var o=[[],function(){return{}}],a=u.getRegister;u.getRegister=function(){var u=a.call(this);if(u)return u;var f,c=function(){var u,f=0;for(var o in n)if(!t(o)){if(0===f&&o!==r||1===f&&o!==e)return o;f++,u=o}if(u!==i)return u}();if(!c)return o;try{f=n[c]}catch(d){return o}return[[],function(n){return{execute:function(){n({default:f,__useDefault:!0})}}}]};var c="undefined"!=typeof navigator&&-1!==navigator.userAgent.indexOf("Trident")}("undefined"!=typeof self?self:global);//# sourceMappingURL=global.min.js.map
+!function(n){function t(t){return!n.hasOwnProperty(t)||!isNaN(t)&&n.length>t||c&&n[t]&&"undefined"!=typeof window&&n[t].parent===window}var r,e,i,u=n.System.constructor.prototype,f=u.import;u.import=function(u,o){return function(){for(var u in r=e=void 0,n)t(u)||(r?e||(e=u):r=u,i=u)}(),f.call(this,u,o)};var o=[[],function(){return{}}],a=u.getRegister;u.getRegister=function(){var u=a.call(this);if(u)return u;var f,c=function(){var u,f=0;for(var o in n)if(!t(o)){if(0===f&&o!==r||1===f&&o!==e)return o;f++,u=o}if(u!==i)return u}();if(!c)return o;try{f=n[c]}catch(d){return o}return[[],function(n){return{execute:function(){n({default:f,__useDefault:!0})}}}]};var c="undefined"!=typeof navigator&&-1!==navigator.userAgent.indexOf("Trident")}("undefined"!=typeof self?self:global);//# sourceMappingURL=global.min.js.map

dist/s.js

 /*
-* SJS 6.3.3
+* SJS 6.4.0
 * Minimal SystemJS Build
@@ -130,2 +130,4 @@ */
 
+  var IMPORT_MAP = hasSymbol ? Symbol() : '#';
+
   function resolveAndComposePackages (packages, outPackages, baseUrl, parentMap, parentUrl) {
@@ -148,3 +150,3 @@ for (var p in packages) {
   function resolveAndComposeImportMap (json, baseUrl, parentMap) {
-    var outMap = { imports: objectAssign({}, parentMap.imports), scopes: objectAssign({}, parentMap.scopes) };
+    var outMap = { imports: objectAssign({}, parentMap.imports), scopes: objectAssign({}, parentMap.scopes), depcache: objectAssign({}, parentMap.depcache) };
 
@@ -160,2 +162,8 @@ if (json.imports)
 
+    if (json.depcache)
+      for (var d in json.depcache) {
+        var resolvedDepcache = resolveUrl(d, baseUrl);
+        outMap.depcache[resolvedDepcache] = json.depcache[d];
+      }
+
     return outMap;
@@ -251,4 +259,4 @@ }
   }
-  function triggerOnload (loader, load, err) {
-    loader.onload(err, load.id, load.d && load.d.map(loadToId));
+  function triggerOnload (loader, load, err, isErrSource) {
+    loader.onload(err, load.id, load.d && load.d.map(loadToId), !!isErrSource);
     if (err)
@@ -350,5 +358,8 @@ throw err;
       }))
-      .then(function (depLoads) {
-        load.d = depLoads;
-      });
+      .then(
+        function (depLoads) {
+          load.d = depLoads;
+        },
+        !true 
+      )
     });
@@ -442,17 +453,19 @@
     load.d.forEach(function (depLoad) {
-      if (false) {
         try {
-          var depLoadPromise;
+          var depLoadPromise = postOrderExec(loader, depLoad, seen);
+          if (depLoadPromise) 
+            (depLoadPromises = depLoadPromises || []).push(depLoadPromise);
         }
         catch (err) {
+          load.e = null;
+          load.er = err;
+          throw err;
         }
-      }
-      else {
-        var depLoadPromise = postOrderExec(loader, depLoad, seen);
-        if (depLoadPromise)
-          (depLoadPromises = depLoadPromises || []).push(depLoadPromise);
-      }
     });
     if (depLoadPromises)
-      return Promise.all(depLoadPromises).then(doExec);
+      return Promise.all(depLoadPromises).then(doExec, function (err) {
+        load.e = null;
+        load.er = err;
+        throw err;
+      });
 
@@ -465,14 +478,11 @@ return doExec();
         if (execPromise) {
-          if (!true)
             execPromise = execPromise.then(function () {
               load.C = load.n;
               load.E = null; // indicates completion
-              triggerOnload(loader, load, null);
+              if (!true) triggerOnload(loader, load, null, true);
             }, function (err) {
-              triggerOnload(loader, load, err);
-            });
-          else
-            execPromise = execPromise.then(function () {
-              load.C = load.n;
+              load.er = err;
               load.E = null;
+              if (!true) triggerOnload(loader, load, err, true);
+              else throw err;
             });
@@ -483,3 +493,3 @@ return load.E = load.E || execPromise;
         load.C = load.n;
-        if (!true) triggerOnload(loader, load, null);
+        if (!true) triggerOnload(loader, load, null, true);
       }
@@ -500,70 +510,5 @@ catch (err) {
   /*
-   * Import map support for SystemJS
-   * 
-   * <script type="systemjs-importmap">{}</script>
-   * OR
-   * <script type="systemjs-importmap" src=package.json></script>
-   * 
-   * Only those import maps available at the time of SystemJS initialization will be loaded
-   * and they will be loaded in DOM order.
-   * 
-   * There is no support for dynamic import maps injection currently.
+   * Script instantiation loading
    */
 
-  var IMPORT_MAP = hasSymbol ? Symbol() : '#';
-  var IMPORT_MAP_PROMISE = hasSymbol ? Symbol() : '$';
-
-  iterateDocumentImportMaps(function (script) {
-    script._t = fetch(script.src).then(function (res) {
-      return res.text();
-    });
-  }, '[src]');
-
-  systemJSPrototype.prepareImport = function () {
-    var loader = this;
-    if (!loader[IMPORT_MAP_PROMISE]) {
-      loader[IMPORT_MAP] = { imports: {}, scopes: {} };
-      loader[IMPORT_MAP_PROMISE] = Promise.resolve();
-      iterateDocumentImportMaps(function (script) {
-        loader[IMPORT_MAP_PROMISE] = loader[IMPORT_MAP_PROMISE].then(function () {
-          return (script._t || script.src && fetch(script.src).then(function (res) { return res.text(); }) || Promise.resolve(script.innerHTML))
-          .then(function (text) {
-            try {
-              return JSON.parse(text);
-            } catch (err) {
-              throw Error( errMsg(1) );
-            }
-          })
-          .then(function (newMap) {
-            loader[IMPORT_MAP] = resolveAndComposeImportMap(newMap, script.src || baseUrl, loader[IMPORT_MAP]);
-          });
-        });
-      }, '');
-    }
-    return loader[IMPORT_MAP_PROMISE];
-  };
-
-  systemJSPrototype.resolve = function (id, parentUrl) {
-    parentUrl = parentUrl || !true  || baseUrl;
-    return resolveImportMap(this[IMPORT_MAP], resolveIfNotPlainOrUrl(id, parentUrl) || id, parentUrl) || throwUnresolved(id, parentUrl);
-  };
-
-  function throwUnresolved (id, parentUrl) {
-    throw Error(errMsg(8,  [id, parentUrl].join(', ') ));
-  }
-
-  function iterateDocumentImportMaps(cb, extraSelector) {
-    if (hasDocument)
-      [].forEach.call(document.querySelectorAll('script[type="systemjs-importmap"]' + extraSelector), cb);
-  }
-
-  /*
-   * Supports loading System.register via script tag injection
-   */
-
-  var systemRegister = systemJSPrototype.register;
-  systemJSPrototype.register = function (deps, declare) {
-    systemRegister.call(this, deps, declare);
-  };
-
   systemJSPrototype.createScript = function (url) {
@@ -601,3 +546,3 @@ var script = document.createElement('script');
 
-  if (hasDocument) {
+  if (hasDocument)
     window.addEventListener('error', function (evt) {
@@ -608,16 +553,123 @@ lastWindowErrorUrl = evt.filename;
 
-    window.addEventListener('DOMContentLoaded', loadScriptModules);
-    loadScriptModules();
+  systemJSPrototype.resolve = function (id, parentUrl) {
+    parentUrl = parentUrl || !true  || baseUrl;
+    return resolveImportMap(this[IMPORT_MAP], resolveIfNotPlainOrUrl(id, parentUrl) || id, parentUrl) || throwUnresolved(id, parentUrl);
+  };
+
+  function throwUnresolved (id, parentUrl) {
+    throw Error(errMsg(8,  [id, parentUrl].join(', ') ));
   }
 
+  /*
+   * SystemJS browser attachments for script and import map processing
+   */
 
-  function loadScriptModules() {
-    [].forEach.call(
-      document.querySelectorAll('script[type=systemjs-module]'), function (script) {
-        if (script.src) {
-          System.import(script.src.slice(0, 7) === 'import:' ? script.src.slice(7) : resolveUrl(script.src, baseUrl));
-        }
-      });
+  var importMapPromise = Promise.resolve({ imports: {}, scopes: {}, depcache: {} });
+
+  // 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;
+    }
+    var loader = this;
+    return importMapPromise.then(function (importMap) {
+      loader[IMPORT_MAP] = importMap;
+    });
+  };
+  if (hasDocument) {
+    processScripts();
+    window.addEventListener('DOMContentLoaded', processScripts);
   }
 
+  const systemInstantiate = systemJSPrototype.instantiate;
+  systemJSPrototype.instantiate = function (url, firstParentUrl) {
+    var preloads = this[IMPORT_MAP].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);
+  };
+
+  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));
+      }
+      else if (script.type === 'systemjs-importmap') {
+        script.sp = true;
+        importMapPromise = importMapPromise.then(function (importMap) {
+          if (script.src)
+            return fetch(script.src).then(function (res) {
+              return res.text();
+            }).then(function (text) {
+              return extendImportMap(importMap, text, script.src);
+            });
+          return extendImportMap(importMap, script.innerHTML, baseUrl);
+        });
+      }
+    });
+  }
+
+  function extendImportMap (importMap, newMapText, newMapUrl) {
+    try {
+      var newMap = JSON.parse(newMapText);
+    } catch (err) {
+      throw Error( errMsg(1) );
+    }
+    return resolveAndComposeImportMap(newMap, newMapUrl, importMap);
+  }
+
+  /**
+   * Auto-import <script src="system-module.js"></script> registrations
+   * Allows the browser preloader to work directly with SystemJS optimization
+   */
+
+  var autoImports = {};
+
+  var systemRegister = systemJSPrototype.register;
+  systemJSPrototype.register = function (deps, declare) {
+    if (hasDocument && document.readyState === 'loading' && typeof deps !== 'string') {
+      var scripts = document.getElementsByTagName('script');
+      var lastScript = scripts[scripts.length - 1];
+      if (lastScript && lastScript.src) {
+        // Only import if not already in the registry.
+        // This avoids re-importing an inline dynamic System.import dependency.
+        // There is still a risk if a user dynamically injects a custom System.register script during DOM load that does an
+        // anomymous registration that is able to execute before DOM load completion, and thus is incorrectly matched to the
+        // last script when it wasn't causing a System.import of that last script, but this is deemed an acceptable edge case
+        // since due to custom user registration injection.
+        // Not using document.currentScript is done to ensure IE11 equivalence.
+        if (!this[REGISTRY][lastScript.src]) {
+          autoImports[lastScript.src] = [deps, declare];
+          // Auto import = immediately import the registration
+          // It is up to the user to manage execution order for deep preloading.
+          this.import(lastScript.src);
+        }
+        return;
+      }
+    }
+    return systemRegister.call(this, deps, declare);
+  };
+
+  var systemInstantiate$1 = systemJSPrototype.instantiate;
+  systemJSPrototype.instantiate = function (url) {
+    var autoImport = autoImports[url];
+    if (autoImport) {
+      delete autoImports[url];
+      return autoImport;
+    }
+    return systemInstantiate$1.apply(this, arguments);
+  };
+
   /*
@@ -624,0 +676,0 @@ * Supports loading System.register in workers

dist/s.min.js

@@ -1,2 +0,2 @@
-!function(){function e(e,n){return(n||"")+" (SystemJS https://git.io/JvFET#"+e+")"}function n(e,n){if(-1!==e.indexOf("\\")&&(e=e.replace(/\\/g,"/")),"/"===e[0]&&"/"===e[1])return n.slice(0,n.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){var t,r=n.slice(0,n.indexOf(":")+1);if(t="/"===n[r.length+1]?"file:"!==r?(t=n.slice(r.length+2)).slice(t.indexOf("/")+1):n.slice(8):n.slice(r.length+("/"===n[r.length])),"/"===e[0])return n.slice(0,n.length-t.length-1)+e;for(var i=t.slice(0,t.lastIndexOf("/")+1)+e,o=[],c=-1,u=0;i.length>u;u++)-1!==c?"/"===i[u]&&(o.push(i.slice(c,u+1)),c=-1):"."===i[u]?"."!==i[u+1]||"/"!==i[u+2]&&u+2!==i.length?"/"===i[u+1]||u+1===i.length?u+=1:c=u:(o.pop(),u+=2):c=u;return-1!==c&&o.push(i.slice(c)),n.slice(0,n.length-t.length)+o.join("")}}function t(e,t){return n(e,t)||(-1!==e.indexOf(":")?e:n("./"+e,t))}function r(e,n){for(var t in n)e[t]=n[t];return e}function i(e,t,r,i,o){for(var c in e){var f=n(c,r)||c,l=e[c];if("string"==typeof l){var a=s(i,n(l,r)||l,o);a?t[f]=a:u("W1",c,l)}}}function o(e,n){if(n[e])return e;var t=e.length;do{var r=e.slice(0,t+1);if(r in n)return r}while(-1!==(t=e.lastIndexOf("/",t-1)))}function c(e,n){var t=o(e,n);if(t){var r=n[t];if(null===r)return;if(t.length>=e.length||"/"===r[r.length-1])return r+e.slice(t.length);u("W2",t,r)}}function u(n,t,r){console.warn(e(n,[r,t].join(", ")))}function s(e,n,t){for(var r=e.scopes,i=t&&o(t,r);i;){var u=c(n,r[i]);if(u)return u;i=o(i.slice(0,i.lastIndexOf("/")),r)}return c(n,e.imports)||-1!==n.indexOf(":")&&n}function f(){this[O]={}}function l(e,n){p&&[].forEach.call(document.querySelectorAll('script[type="systemjs-importmap"]'+n),e)}function a(){[].forEach.call(document.querySelectorAll("script[type=systemjs-module]"),(function(e){e.src&&System.import("import:"===e.src.slice(0,7)?e.src.slice(7):t(e.src,h))}))}var h,v="undefined"!=typeof Symbol,d="undefined"!=typeof self,p="undefined"!=typeof document,m=d?self:global;if(p){var g=document.querySelector("base[href]");g&&(h=g.href)}if(!h&&"undefined"!=typeof location){var y=(h=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==y&&(h=h.slice(0,y+1))}var E,S=v&&Symbol.toStringTag,O=v?Symbol():"@",x=f.prototype;x.import=function(n,t){var r=this;return Promise.resolve(r.prepareImport()).then((function(){return r.resolve(n,t)})).then((function(n){var t=function n(t,r,i){var o=t[O][r];if(o)return o;var c=[],u=Object.create(null);S&&Object.defineProperty(u,S,{value:"Module"});var s=Promise.resolve().then((function(){return t.instantiate(r,i)})).then((function(n){if(!n)throw Error(e(2,r));var i=n[1]((function(e,n){o.h=!0;var t=!1;if("object"!=typeof e)e in u&&u[e]===n||(u[e]=n,t=!0);else{for(var r in e)n=e[r],r in u&&u[r]===n||(u[r]=n,t=!0);e.__esModule&&(u.__esModule=e.__esModule)}if(t)for(var i=0;c.length>i;i++){var s=c[i];s&&s(u)}return n}),2===n[1].length?{import:function(e){return t.import(e,r)},meta:t.createContext(r)}:void 0);return o.e=i.execute||function(){},[n[0],i.setters||[]]})),f=s.then((function(e){return Promise.all(e[0].map((function(i,o){var c=e[1][o];return Promise.resolve(t.resolve(i,r)).then((function(e){var i=n(t,e,r);return Promise.resolve(i.I).then((function(){return c&&(i.i.push(c),!i.h&&i.I||c(i.n)),i}))}))}))).then((function(e){o.d=e}))}));return f.catch((function(e){o.e=null,o.er=e})),o=t[O][r]={id:r,i:c,n:u,I:s,L:f,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}(r,n);return t.C||function(e,n){return n.C=function e(n,t,r){if(!r[t.id])return r[t.id]=!0,Promise.resolve(t.L).then((function(){return Promise.all(t.d.map((function(t){return e(n,t,r)})))}))}(e,n,{}).then((function(){return function e(n,t,r){function i(){try{var e=t.e.call(w);if(e)return e=e.then((function(){t.C=t.n,t.E=null})),t.E=t.E||e;t.C=t.n}catch(n){throw t.er=n,n}finally{t.L=t.I=void 0,t.e=null}}if(!r[t.id]){if(r[t.id]=!0,!t.e){if(t.er)throw t.er;return t.E?t.E:void 0}var o;return t.d.forEach((function(t){var i;(i=e(n,t,r))&&(o=o||[]).push(i)})),o?Promise.all(o).then(i):i()}}(e,n,{})})).then((function(){return n.n}))}(r,t)}))},x.createContext=function(e){return{url:e}},x.register=function(e,n){E=[e,n]},x.getRegister=function(){var e=E;return E=void 0,e};var w=Object.freeze(Object.create(null));m.System=new f;var P=v?Symbol():"#",b=v?Symbol():"$";l((function(e){e._t=fetch(e.src).then((function(e){return e.text()}))}),"[src]"),x.prepareImport=function(){var n=this;return n[b]||(n[P]={imports:{},scopes:{}},n[b]=Promise.resolve(),l((function(o){n[b]=n[b].then((function(){return(o._t||o.src&&fetch(o.src).then((function(e){return e.text()}))||Promise.resolve(o.innerHTML)).then((function(n){try{return JSON.parse(n)}catch(t){throw Error(e(1))}})).then((function(e){n[P]=function(e,n,o){var c={imports:r({},o.imports),scopes:r({},o.scopes)};if(e.imports&&i(e.imports,c.imports,n,o,null),e.scopes)for(var u in e.scopes){var s=t(u,n);i(e.scopes[u],c.scopes[s]||(c.scopes[s]={}),n,o,s)}return c}(e,o.src||h,n[P])}))}))}),"")),n[b]},x.resolve=function(t,r){return s(this[P],n(t,r=r||h)||t,r)||function(n,t){throw Error(e(8,[n,t].join(", ")))}(t,r)};var j,C,I=x.register;x.register=function(e,n){I.call(this,e,n)},x.createScript=function(e){var n=document.createElement("script");return n.charset="utf-8",n.async=!0,n.crossOrigin="anonymous",n.src=e,n},x.instantiate=function(n,t){var r=this;return new Promise((function(i,o){var c=x.createScript(n);c.addEventListener("error",(function(){o(Error(e(3,[n,t].join(", "))))})),c.addEventListener("load",(function(){document.head.removeChild(c),j===n?o(C):i(r.getRegister())})),document.head.appendChild(c)}))},p&&(window.addEventListener("error",(function(e){j=e.filename,C=e.error})),window.addEventListener("DOMContentLoaded",a),a()),d&&"function"==typeof importScripts&&(x.instantiate=function(e){var n=this;return Promise.resolve().then((function(){return importScripts(e),n.getRegister()}))})}();
+!function(){function e(e,t){return(t||"")+" (SystemJS https://git.io/JvFET#"+e+")"}function t(e,t){if(-1!==e.indexOf("\\")&&(e=e.replace(/\\/g,"/")),"/"===e[0]&&"/"===e[1])return t.slice(0,t.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){var n,r=t.slice(0,t.indexOf(":")+1);if(n="/"===t[r.length+1]?"file:"!==r?(n=t.slice(r.length+2)).slice(n.indexOf("/")+1):t.slice(8):t.slice(r.length+("/"===t[r.length])),"/"===e[0])return t.slice(0,t.length-n.length-1)+e;for(var i=n.slice(0,n.lastIndexOf("/")+1)+e,o=[],c=-1,s=0;i.length>s;s++)-1!==c?"/"===i[s]&&(o.push(i.slice(c,s+1)),c=-1):"."===i[s]?"."!==i[s+1]||"/"!==i[s+2]&&s+2!==i.length?"/"===i[s+1]||s+1===i.length?s+=1:c=s:(o.pop(),s+=2):c=s;return-1!==c&&o.push(i.slice(c)),t.slice(0,t.length-n.length)+o.join("")}}function n(e,n){return t(e,n)||(-1!==e.indexOf(":")?e:t("./"+e,n))}function r(e,t){for(var n in t)e[n]=t[n];return e}function i(e,n,r,i,o){for(var c in e){var f=t(c,r)||c,a=e[c];if("string"==typeof a){var l=u(i,t(a,r)||a,o);l?n[f]=l:s("W1",c,a)}}}function o(e,t){if(t[e])return e;var n=e.length;do{var r=e.slice(0,n+1);if(r in t)return r}while(-1!==(n=e.lastIndexOf("/",n-1)))}function c(e,t){var n=o(e,t);if(n){var r=t[n];if(null===r)return;if(n.length>=e.length||"/"===r[r.length-1])return r+e.slice(n.length);s("W2",n,r)}}function s(t,n,r){console.warn(e(t,[r,n].join(", ")))}function u(e,t,n){for(var r=e.scopes,i=n&&o(n,r);i;){var s=c(t,r[i]);if(s)return s;i=o(i.slice(0,i.lastIndexOf("/")),r)}return c(t,e.imports)||-1!==t.indexOf(":")&&t}function f(){this[x]={}}function a(t,n,r){var i=t[x][n];if(i)return i;var o=[],c=Object.create(null);w&&Object.defineProperty(c,w,{value:"Module"});var s=Promise.resolve().then((function(){return t.instantiate(n,r)})).then((function(r){if(!r)throw Error(e(2,n));var s=r[1]((function(e,t){i.h=!0;var n=!1;if("object"!=typeof e)e in c&&c[e]===t||(c[e]=t,n=!0);else{for(var r in e)t=e[r],r in c&&c[r]===t||(c[r]=t,n=!0);e.__esModule&&(c.__esModule=e.__esModule)}if(n)for(var s=0;o.length>s;s++){var u=o[s];u&&u(c)}return t}),2===r[1].length?{import:function(e){return t.import(e,n)},meta:t.createContext(n)}:void 0);return i.e=s.execute||function(){},[r[0],s.setters||[]]})),u=s.then((function(e){return Promise.all(e[0].map((function(r,i){var o=e[1][i];return Promise.resolve(t.resolve(r,n)).then((function(e){var r=a(t,e,n);return Promise.resolve(r.I).then((function(){return o&&(r.i.push(o),!r.h&&r.I||o(r.n)),r}))}))}))).then((function(e){i.d=e}),!1)}));return u.catch((function(e){i.e=null,i.er=e})),i=t[x][n]={id:n,i:o,n:c,I:s,L:u,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}function l(){[].forEach.call(document.querySelectorAll("script"),(function(e){if(!e.sp)if("systemjs-module"===e.type){if(e.sp=!0,!e.src)return;System.import("import:"===e.src.slice(0,7)?e.src.slice(7):n(e.src,d))}else"systemjs-importmap"===e.type&&(e.sp=!0,I=I.then((function(t){return e.src?fetch(e.src).then((function(e){return e.text()})).then((function(n){return h(t,n,e.src)})):h(t,e.innerHTML,d)})))}))}function h(t,o,c){try{var s=JSON.parse(o)}catch(u){throw Error(e(1))}return function(e,t,o){var c={imports:r({},o.imports),scopes:r({},o.scopes),depcache:r({},o.depcache)};if(e.imports&&i(e.imports,c.imports,t,o,null),e.scopes)for(var s in e.scopes){var u=n(s,t);i(e.scopes[s],c.scopes[u]||(c.scopes[u]={}),t,o,u)}if(e.depcache)for(var f in e.depcache){var a=n(f,t);c.depcache[a]=e.depcache[f]}return c}(s,c,t)}var d,p="undefined"!=typeof Symbol,v="undefined"!=typeof self,m="undefined"!=typeof document,g=v?self:global;if(m){var y=document.querySelector("base[href]");y&&(d=y.href)}if(!d&&"undefined"!=typeof location){var E=(d=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==E&&(d=d.slice(0,E+1))}var O,S=p?Symbol():"#",w=p&&Symbol.toStringTag,x=p?Symbol():"@",P=f.prototype;P.import=function(e,t){var n=this;return Promise.resolve(n.prepareImport()).then((function(){return n.resolve(e,t)})).then((function(e){var t=a(n,e);return t.C||function(e,t){return t.C=function e(t,n,r){if(!r[n.id])return r[n.id]=!0,Promise.resolve(n.L).then((function(){return Promise.all(n.d.map((function(n){return e(t,n,r)})))}))}(e,t,{}).then((function(){return function e(t,n,r){function i(){try{var e=n.e.call(C);if(e)return e=e.then((function(){n.C=n.n,n.E=null}),(function(e){throw n.er=e,n.E=null,e})),n.E=n.E||e;n.C=n.n}catch(t){throw n.er=t,t}finally{n.L=n.I=void 0,n.e=null}}if(!r[n.id]){if(r[n.id]=!0,!n.e){if(n.er)throw n.er;return n.E?n.E:void 0}var o;return n.d.forEach((function(i){try{var c=e(t,i,r);c&&(o=o||[]).push(c)}catch(s){throw n.e=null,n.er=s,s}})),o?Promise.all(o).then(i,(function(e){throw n.e=null,n.er=e,e})):i()}}(e,t,{})})).then((function(){return t.n}))}(n,t)}))},P.createContext=function(e){return{url:e}},P.register=function(e,t){O=[e,t]},P.getRegister=function(){var e=O;return O=void 0,e};var b,j,C=Object.freeze(Object.create(null));g.System=new f,P.createScript=function(e){var t=document.createElement("script");return t.charset="utf-8",t.async=!0,t.crossOrigin="anonymous",t.src=e,t},P.instantiate=function(t,n){var r=this;return new Promise((function(i,o){var c=P.createScript(t);c.addEventListener("error",(function(){o(Error(e(3,[t,n].join(", "))))})),c.addEventListener("load",(function(){document.head.removeChild(c),b===t?o(j):i(r.getRegister())})),document.head.appendChild(c)}))},m&&window.addEventListener("error",(function(e){b=e.filename,j=e.error})),P.resolve=function(n,r){return u(this[S],t(n,r=r||d)||n,r)||function(t,n){throw Error(e(8,[t,n].join(", ")))}(n,r)};var I=Promise.resolve({imports:{},scopes:{},depcache:{}}),L=m;P.prepareImport=function(e){(L||e)&&(l(),L=!1);var t=this;return I.then((function(e){t[S]=e}))},m&&(l(),window.addEventListener("DOMContentLoaded",l));const M=P.instantiate;P.instantiate=function(e,t){var n=this[S].depcache[e];if(n)for(var r=0;n.length>r;r++)a(this,this.resolve(n[r],e),e);return M.call(this,e,t)};var _={},T=P.register;P.register=function(e,t){if(m&&"loading"===document.readyState&&"string"!=typeof e){var n=document.getElementsByTagName("script"),r=n[n.length-1];if(r&&r.src)return void(this[x][r.src]||(_[r.src]=[e,t],this.import(r.src)))}return T.call(this,e,t)};var J=P.instantiate;P.instantiate=function(e){var t=_[e];return t?(delete _[e],t):J.apply(this,arguments)},v&&"function"==typeof importScripts&&(P.instantiate=function(e){var t=this;return Promise.resolve().then((function(){return importScripts(e),t.getRegister()}))})}();
 //# sourceMappingURL=s.min.js.map

dist/system.js

 /*
-* SystemJS 6.3.3
+* SystemJS 6.4.0
 */
@@ -129,2 +129,4 @@ (function () {
 
+  var IMPORT_MAP = hasSymbol ? Symbol() : '#';
+
   function resolveAndComposePackages (packages, outPackages, baseUrl, parentMap, parentUrl) {
@@ -147,3 +149,3 @@ for (var p in packages) {
   function resolveAndComposeImportMap (json, baseUrl, parentMap) {
-    var outMap = { imports: objectAssign({}, parentMap.imports), scopes: objectAssign({}, parentMap.scopes) };
+    var outMap = { imports: objectAssign({}, parentMap.imports), scopes: objectAssign({}, parentMap.scopes), depcache: objectAssign({}, parentMap.depcache) };
 
@@ -159,2 +161,8 @@ if (json.imports)
 
+    if (json.depcache)
+      for (var d in json.depcache) {
+        var resolvedDepcache = resolveUrl(d, baseUrl);
+        outMap.depcache[resolvedDepcache] = json.depcache[d];
+      }
+
     return outMap;
@@ -253,4 +261,4 @@ }
   }
-  function triggerOnload (loader, load, err) {
-    loader.onload(err, load.id, load.d && load.d.map(loadToId));
+  function triggerOnload (loader, load, err, isErrSource) {
+    loader.onload(err, load.id, load.d && load.d.map(loadToId), !!isErrSource);
     if (err)
@@ -332,3 +340,3 @@ throw err;
     instantiatePromise = instantiatePromise.catch(function (err) {
-        triggerOnload(loader, load, err);
+        triggerOnload(loader, load, err, true);
       });
@@ -357,5 +365,10 @@
       }))
-      .then(function (depLoads) {
-        load.d = depLoads;
-      });
+      .then(
+        function (depLoads) {
+          load.d = depLoads;
+        },
+         function (err) {
+          triggerOnload(loader, load, err, false);
+        }
+      )
     });
@@ -449,22 +462,19 @@
     load.d.forEach(function (depLoad) {
-      if (true) {
         try {
           var depLoadPromise = postOrderExec(loader, depLoad, seen);
-          if (depLoadPromise) {
-            depLoadPromise.catch(function (err) {
-              triggerOnload(loader, load, err);
-            });
+          if (depLoadPromise) 
             (depLoadPromises = depLoadPromises || []).push(depLoadPromise);
-          }
         }
         catch (err) {
-          triggerOnload(loader, load, err);
+          load.e = null;
+          load.er = err;
+          triggerOnload(loader, load, err, false);
         }
-      }
-      else {
-        var depLoadPromise;
-      }
     });
     if (depLoadPromises)
-      return Promise.all(depLoadPromises).then(doExec);
+      return Promise.all(depLoadPromises).then(doExec, function (err) {
+        load.e = null;
+        load.er = err;
+        triggerOnload(loader, load, err, false);
+      });
 
@@ -477,14 +487,11 @@ return doExec();
         if (execPromise) {
-          if (!false)
             execPromise = execPromise.then(function () {
               load.C = load.n;
               load.E = null; // indicates completion
-              triggerOnload(loader, load, null);
+              if (!false) triggerOnload(loader, load, null, true);
             }, function (err) {
-              triggerOnload(loader, load, err);
-            });
-          else
-            execPromise = execPromise.then(function () {
-              load.C = load.n;
+              load.er = err;
               load.E = null;
+              if (!false) triggerOnload(loader, load, err, true);
+              else throw err;
             });
@@ -495,7 +502,7 @@ return load.E = load.E || execPromise;
         load.C = load.n;
-        if (!false) triggerOnload(loader, load, null);
+        if (!false) triggerOnload(loader, load, null, true);
       }
       catch (err) {
         load.er = err;
-        triggerOnload(loader, load, err);
+        triggerOnload(loader, load, err, true);
       }
@@ -512,70 +519,5 @@ finally {
   /*
-   * Import map support for SystemJS
-   * 
-   * <script type="systemjs-importmap">{}</script>
-   * OR
-   * <script type="systemjs-importmap" src=package.json></script>
-   * 
-   * Only those import maps available at the time of SystemJS initialization will be loaded
-   * and they will be loaded in DOM order.
-   * 
-   * There is no support for dynamic import maps injection currently.
+   * Script instantiation loading
    */
 
-  var IMPORT_MAP = hasSymbol ? Symbol() : '#';
-  var IMPORT_MAP_PROMISE = hasSymbol ? Symbol() : '$';
-
-  iterateDocumentImportMaps(function (script) {
-    script._t = fetch(script.src).then(function (res) {
-      return res.text();
-    });
-  }, '[src]');
-
-  systemJSPrototype.prepareImport = function () {
-    var loader = this;
-    if (!loader[IMPORT_MAP_PROMISE]) {
-      loader[IMPORT_MAP] = { imports: {}, scopes: {} };
-      loader[IMPORT_MAP_PROMISE] = Promise.resolve();
-      iterateDocumentImportMaps(function (script) {
-        loader[IMPORT_MAP_PROMISE] = loader[IMPORT_MAP_PROMISE].then(function () {
-          return (script._t || script.src && fetch(script.src).then(function (res) { return res.text(); }) || Promise.resolve(script.innerHTML))
-          .then(function (text) {
-            try {
-              return JSON.parse(text);
-            } catch (err) {
-              throw Error( errMsg(1, "systemjs-importmap contains invalid JSON"));
-            }
-          })
-          .then(function (newMap) {
-            loader[IMPORT_MAP] = resolveAndComposeImportMap(newMap, script.src || baseUrl, loader[IMPORT_MAP]);
-          });
-        });
-      }, '');
-    }
-    return loader[IMPORT_MAP_PROMISE];
-  };
-
-  systemJSPrototype.resolve = function (id, parentUrl) {
-    parentUrl = parentUrl || !true  || baseUrl;
-    return resolveImportMap(this[IMPORT_MAP], resolveIfNotPlainOrUrl(id, parentUrl) || id, parentUrl) || throwUnresolved(id, parentUrl);
-  };
-
-  function throwUnresolved (id, parentUrl) {
-    throw Error(errMsg(8,  "Unable to resolve bare specifier '" + id + (parentUrl ? "' from " + parentUrl : "'")));
-  }
-
-  function iterateDocumentImportMaps(cb, extraSelector) {
-    if (hasDocument)
-      [].forEach.call(document.querySelectorAll('script[type="systemjs-importmap"]' + extraSelector), cb);
-  }
-
-  /*
-   * Supports loading System.register via script tag injection
-   */
-
-  var systemRegister = systemJSPrototype.register;
-  systemJSPrototype.register = function (deps, declare) {
-    systemRegister.call(this, deps, declare);
-  };
-
   systemJSPrototype.createScript = function (url) {
@@ -613,3 +555,3 @@ var script = document.createElement('script');
 
-  if (hasDocument) {
+  if (hasDocument)
     window.addEventListener('error', function (evt) {
@@ -620,16 +562,123 @@ lastWindowErrorUrl = evt.filename;
 
-    window.addEventListener('DOMContentLoaded', loadScriptModules);
-    loadScriptModules();
+  systemJSPrototype.resolve = function (id, parentUrl) {
+    parentUrl = parentUrl || !true  || baseUrl;
+    return resolveImportMap(this[IMPORT_MAP], resolveIfNotPlainOrUrl(id, parentUrl) || id, parentUrl) || throwUnresolved(id, parentUrl);
+  };
+
+  function throwUnresolved (id, parentUrl) {
+    throw Error(errMsg(8,  "Unable to resolve bare specifier '" + id + (parentUrl ? "' from " + parentUrl : "'")));
   }
 
+  /*
+   * SystemJS browser attachments for script and import map processing
+   */
 
-  function loadScriptModules() {
-    [].forEach.call(
-      document.querySelectorAll('script[type=systemjs-module]'), function (script) {
-        if (script.src) {
-          System.import(script.src.slice(0, 7) === 'import:' ? script.src.slice(7) : resolveUrl(script.src, baseUrl));
-        }
-      });
+  var importMapPromise = Promise.resolve({ imports: {}, scopes: {}, depcache: {} });
+
+  // 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;
+    }
+    var loader = this;
+    return importMapPromise.then(function (importMap) {
+      loader[IMPORT_MAP] = importMap;
+    });
+  };
+  if (hasDocument) {
+    processScripts();
+    window.addEventListener('DOMContentLoaded', processScripts);
   }
 
+  const systemInstantiate = systemJSPrototype.instantiate;
+  systemJSPrototype.instantiate = function (url, firstParentUrl) {
+    var preloads = this[IMPORT_MAP].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);
+  };
+
+  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));
+      }
+      else if (script.type === 'systemjs-importmap') {
+        script.sp = true;
+        importMapPromise = importMapPromise.then(function (importMap) {
+          if (script.src)
+            return fetch(script.src).then(function (res) {
+              return res.text();
+            }).then(function (text) {
+              return extendImportMap(importMap, text, script.src);
+            });
+          return extendImportMap(importMap, script.innerHTML, baseUrl);
+        });
+      }
+    });
+  }
+
+  function extendImportMap (importMap, newMapText, newMapUrl) {
+    try {
+      var newMap = JSON.parse(newMapText);
+    } catch (err) {
+      throw Error( errMsg(1, "systemjs-importmap contains invalid JSON"));
+    }
+    return resolveAndComposeImportMap(newMap, newMapUrl, importMap);
+  }
+
+  /**
+   * Auto-import <script src="system-module.js"></script> registrations
+   * Allows the browser preloader to work directly with SystemJS optimization
+   */
+
+  var autoImports = {};
+
+  var systemRegister = systemJSPrototype.register;
+  systemJSPrototype.register = function (deps, declare) {
+    if (hasDocument && document.readyState === 'loading' && typeof deps !== 'string') {
+      var scripts = document.getElementsByTagName('script');
+      var lastScript = scripts[scripts.length - 1];
+      if (lastScript && lastScript.src) {
+        // Only import if not already in the registry.
+        // This avoids re-importing an inline dynamic System.import dependency.
+        // There is still a risk if a user dynamically injects a custom System.register script during DOM load that does an
+        // anomymous registration that is able to execute before DOM load completion, and thus is incorrectly matched to the
+        // last script when it wasn't causing a System.import of that last script, but this is deemed an acceptable edge case
+        // since due to custom user registration injection.
+        // Not using document.currentScript is done to ensure IE11 equivalence.
+        if (!this[REGISTRY][lastScript.src]) {
+          autoImports[lastScript.src] = [deps, declare];
+          // Auto import = immediately import the registration
+          // It is up to the user to manage execution order for deep preloading.
+          this.import(lastScript.src);
+        }
+        return;
+      }
+    }
+    return systemRegister.call(this, deps, declare);
+  };
+
+  var systemInstantiate$1 = systemJSPrototype.instantiate;
+  systemJSPrototype.instantiate = function (url) {
+    var autoImport = autoImports[url];
+    if (autoImport) {
+      delete autoImports[url];
+      return autoImport;
+    }
+    return systemInstantiate$1.apply(this, arguments);
+  };
+
   /*
@@ -654,3 +703,3 @@ * Supports loading System.register in workers
   (function (global) {
-    var systemJSPrototype = System.constructor.prototype;
+    var systemJSPrototype = global.System.constructor.prototype;
 
@@ -657,0 +706,0 @@ // safari unpredictably lists some new globals first or second in object order

dist/system.min.js

 /*
-* SystemJS 6.3.3
+* SystemJS 6.4.0
 */
-!function(){function e(e,t){return(t||"")+" (SystemJS Error#"+e+" https://git.io/JvFET#"+e+")"}function t(e,t){if(-1!==e.indexOf("\\")&&(e=e.replace(/\\/g,"/")),"/"===e[0]&&"/"===e[1])return t.slice(0,t.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){var n,r=t.slice(0,t.indexOf(":")+1);if(n="/"===t[r.length+1]?"file:"!==r?(n=t.slice(r.length+2)).slice(n.indexOf("/")+1):t.slice(8):t.slice(r.length+("/"===t[r.length])),"/"===e[0])return t.slice(0,t.length-n.length-1)+e;for(var i=n.slice(0,n.lastIndexOf("/")+1)+e,o=[],u=-1,c=0;i.length>c;c++)-1!==u?"/"===i[c]&&(o.push(i.slice(u,c+1)),u=-1):"."===i[c]?"."!==i[c+1]||"/"!==i[c+2]&&c+2!==i.length?"/"===i[c+1]||c+1===i.length?c+=1:u=c:(o.pop(),c+=2):u=c;return-1!==u&&o.push(i.slice(u)),t.slice(0,t.length-n.length)+o.join("")}}function n(e,n){return t(e,n)||(-1!==e.indexOf(":")?e:t("./"+e,n))}function r(e,t){for(var n in t)e[n]=t[n];return e}function 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package.json

 {
   "name": "systemjs",
-  "version": "6.3.3",
+  "version": "6.4.0",
   "main": "dist/system-node.cjs",
@@ -5,0 +5,0 @@ "exports": {

README.md

@@ -81,2 +81,3 @@ # SystemJS
 * [Transform loader](dist/extras/transform.js) support, using fetch and eval, supporting a hookable `loader.transform`
+* [Dynamic import maps](dist/extras/dynamic-import-maps.js) support. This is currently a _potential_ new standard [feature](https://github.com/guybedford/import-maps-extensions#lazy-loading-of-import-maps).
 
@@ -83,0 +84,0 @@ The following extras are included in system.js loader by default, and can be added to the s.js loader for a smaller tailored footprint:

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Uses debug, reflection and dynamic code execution features.

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Total package byte prevSize

448233

increased by3.92%

Number of package files

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increased by9.09%

Lines of code

7929

increased by1.46%

Number of lines in readme file

286

increased by0.35%

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decreased by-20.69%

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Number of low supply chain risk alerts

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