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systemjs - npm Package Compare versions

Comparing version 6.6.0 to 6.6.1

3

CHANGELOG.md

@@ -0,1 +1,4 @@

SystemJS 6.6.1
* IE11 support bug fix (https://github.com/systemjs/systemjs/pull/2247)
SystemJS 6.6.0

@@ -2,0 +5,0 @@ * Fix autoimport dynamic import conflicts (https://github.com/systemjs/systemjs/pull/2245)

4

dist/s.js
/*
* SJS 6.6.0
* SJS 6.6.1
* Minimal SystemJS Build

@@ -568,3 +568,3 @@ */

// - https://bugs.webkit.org/show_bug.cgi?id=171566
if (!url.startsWith(baseOrigin + '/'))
if (url.indexOf(baseOrigin + '/'))
script.crossOrigin = 'anonymous';

@@ -571,0 +571,0 @@ var integrity = importMap.integrity[url];

2

dist/s.min.js

@@ -1,2 +0,2 @@

!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,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)),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,n,r,i,o){for(var s in e){var f=t(s,r)||s,l=e[s];if("string"==typeof l){var a=u(i,t(l,r)||l,o);a?n[f]=a:c("W1",s,l)}}}function i(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 o(e,t){var n=i(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);c("W2",n,r)}}function c(t,n,r){console.warn(e(t,[r,n].join(", ")))}function u(e,t,n){for(var r=e.scopes,c=n&&i(n,r);c;){var u=o(t,r[c]);if(u)return u;c=i(c.slice(0,c.lastIndexOf("/")),r)}return o(t,e.imports)||-1!==t.indexOf(":")&&t}function s(){this[O]={}}function f(t,n,r){var i=t[O][n];if(i)return i;var o=[],c=Object.create(null);E&&Object.defineProperty(c,E,{value:"Module"});var u=Promise.resolve().then((function(){return t.instantiate(n,r)})).then((function(r){if(!r)throw Error(e(2,n));var u=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 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i=t.src?fetch(t.src).then((function(e){return e.text()})):t.innerHTML;j=j.then((function(){return i})).then((function(i){!function(t,i,o){try{var c=JSON.parse(i)}catch(u){throw Error(e(1))}!function(e,t,i){var o;for(o in e.imports&&r(e.imports,i.imports,t,i,null),e.scopes||{}){var c=n(o,t);r(e.scopes[o],i.scopes[c]||(i.scopes[c]={}),t,i,c)}for(o in e.depcache||{})i.depcache[n(o,t)]=e.depcache[o];for(o in e.integrity||{})i.integrity[n(o,t)]=e.integrity[o]}(c,o,t)}(b,i,t.src||a)}))}}))}var a,h="undefined"!=typeof Symbol,v="undefined"!=typeof self,d="undefined"!=typeof document,p=v?self:global;if(d){var m=document.querySelector("base[href]");m&&(a=m.href)}if(!a&&"undefined"!=typeof location){var g=(a=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==g&&(a=a.slice(0,g+1))}var y,E=h&&Symbol.toStringTag,O=h?Symbol():"@",w=s.prototype;w.import=function(e,t){var n=this;return Promise.resolve(n.prepareImport()).then((function(){return n.resolve(e,t)})).then((function(e){var t=f(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(S);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(u){throw n.e=null,n.er=u,u}})),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)}))},w.createContext=function(e){var t=this;return{url:e,resolve:function(n,r){return Promise.resolve(t.resolve(n,r||e))}}},w.register=function(e,t){y=[e,t]},w.getRegister=function(){var e=y;return y=void 0,e};var S=Object.freeze(Object.create(null));p.System=new s;var x,P,j=Promise.resolve(),b={imports:{},scopes:{},depcache:{},integrity:{}},C=d;if(w.prepareImport=function(e){return(C||e)&&(l(),C=!1),j},d&&(l(),window.addEventListener("DOMContentLoaded",l)),d){window.addEventListener("error",(function(e){L=e.filename,M=e.error}));var I=location.origin}w.createScript=function(e){var t=document.createElement("script");t.async=!0,e.startsWith(I+"/")||(t.crossOrigin="anonymous");var n=b.integrity[e];return n&&(t.integrity=n),t.src=e,t};var L,M,T={},_=w.register;w.register=function(e,t){if(d&&"loading"===document.readyState&&"string"!=typeof e){var n=document.getElementsByTagName("script"),r=n[n.length-1],i=r&&r.src;if(i){x=e;var o=this;P=setTimeout((function(){T[i]=[e,t],o.import(i)}))}}else x=void 0;return _.call(this,e,t)},w.instantiate=function(t,n){var r=T[t];if(r)return delete T[t],r;var i=this;return new Promise((function(r,o){var c=w.createScript(t);c.addEventListener("error",(function(){o(Error(e(3,[t,n].join(", "))))})),c.addEventListener("load",(function(){if(document.head.removeChild(c),L===t)o(M);else{var e=i.getRegister();e&&e[0]===x&&clearTimeout(P),r(e)}})),document.head.appendChild(c)}))},w.resolve=function(n,r){return u(b,t(n,r=r||a)||n,r)||function(t,n){throw Error(e(8,[t,n].join(", ")))}(n,r)};var J=w.instantiate;w.instantiate=function(e,t){var n=b.depcache[e];if(n)for(var r=0;n.length>r;r++)f(this,this.resolve(n[r],e),e);return J.call(this,e,t)},v&&"function"==typeof importScripts&&(w.instantiate=function(e){var t=this;return Promise.resolve().then((function(){return importScripts(e),t.getRegister()}))})}();
!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,t,r,i,o){for(var s in e){var f=n(s,r)||s,l=e[s];if("string"==typeof l){var a=u(i,n(l,r)||l,o);a?t[f]=a:c("W1",s,l)}}}function i(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 o(e,n){var t=i(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);c("W2",t,r)}}function c(n,t,r){console.warn(e(n,[r,t].join(", ")))}function u(e,n,t){for(var r=e.scopes,c=t&&i(t,r);c;){var u=o(n,r[c]);if(u)return u;c=i(c.slice(0,c.lastIndexOf("/")),r)}return o(n,e.imports)||-1!==n.indexOf(":")&&n}function s(){this[O]={}}function f(n,t,r){var i=n[O][t];if(i)return i;var o=[],c=Object.create(null);E&&Object.defineProperty(c,E,{value:"Module"});var u=Promise.resolve().then((function(){return n.instantiate(t,r)})).then((function(r){if(!r)throw Error(e(2,t));var u=r[1]((function(e,n){i.h=!0;var t=!1;if("object"!=typeof e)e in c&&c[e]===n||(c[e]=n,t=!0);else{for(var r in e)n=e[r],r in c&&c[r]===n||(c[r]=n,t=!0);e.__esModule&&(c.__esModule=e.__esModule)}if(t)for(var u=0;o.length>u;u++){var s=o[u];s&&s(c)}return n}),2===r[1].length?{import:function(e){return n.import(e,t)},meta:n.createContext(t)}:void 0);return i.e=u.execute||function(){},[r[0],u.setters||[]]})),s=u.then((function(e){return Promise.all(e[0].map((function(r,i){var o=e[1][i];return Promise.resolve(n.resolve(r,t)).then((function(e){var r=f(n,e,t);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 s.catch((function(e){i.e=null,i.er=e})),i=n[O][t]={id:t,i:o,n:c,I:u,L:s,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(n){if(!n.sp)if("systemjs-module"===n.type){if(n.sp=!0,!n.src)return;System.import("import:"===n.src.slice(0,7)?n.src.slice(7):t(n.src,a))}else if("systemjs-importmap"===n.type){n.sp=!0;var i=n.src?fetch(n.src).then((function(e){return e.text()})):n.innerHTML;j=j.then((function(){return i})).then((function(i){!function(n,i,o){try{var c=JSON.parse(i)}catch(u){throw Error(e(1))}!function(e,n,i){var o;for(o in e.imports&&r(e.imports,i.imports,n,i,null),e.scopes||{}){var c=t(o,n);r(e.scopes[o],i.scopes[c]||(i.scopes[c]={}),n,i,c)}for(o in e.depcache||{})i.depcache[t(o,n)]=e.depcache[o];for(o in e.integrity||{})i.integrity[t(o,n)]=e.integrity[o]}(c,o,n)}(b,i,n.src||a)}))}}))}var a,h="undefined"!=typeof Symbol,v="undefined"!=typeof self,d="undefined"!=typeof document,p=v?self:global;if(d){var m=document.querySelector("base[href]");m&&(a=m.href)}if(!a&&"undefined"!=typeof location){var g=(a=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==g&&(a=a.slice(0,g+1))}var y,E=h&&Symbol.toStringTag,O=h?Symbol():"@",w=s.prototype;w.import=function(e,n){var t=this;return Promise.resolve(t.prepareImport()).then((function(){return t.resolve(e,n)})).then((function(e){var n=f(t,e);return n.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(S);if(e)return e=e.then((function(){t.C=t.n,t.E=null}),(function(e){throw t.er=e,t.E=null,e})),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(i){try{var c=e(n,i,r);c&&(o=o||[]).push(c)}catch(u){throw t.e=null,t.er=u,u}})),o?Promise.all(o).then(i,(function(e){throw t.e=null,t.er=e,e})):i()}}(e,n,{})})).then((function(){return n.n}))}(t,n)}))},w.createContext=function(e){var n=this;return{url:e,resolve:function(t,r){return Promise.resolve(n.resolve(t,r||e))}}},w.register=function(e,n){y=[e,n]},w.getRegister=function(){var e=y;return y=void 0,e};var S=Object.freeze(Object.create(null));p.System=new s;var x,P,j=Promise.resolve(),b={imports:{},scopes:{},depcache:{},integrity:{}},C=d;if(w.prepareImport=function(e){return(C||e)&&(l(),C=!1),j},d&&(l(),window.addEventListener("DOMContentLoaded",l)),d){window.addEventListener("error",(function(e){L=e.filename,M=e.error}));var I=location.origin}w.createScript=function(e){var n=document.createElement("script");n.async=!0,e.indexOf(I+"/")&&(n.crossOrigin="anonymous");var t=b.integrity[e];return t&&(n.integrity=t),n.src=e,n};var L,M,T={},_=w.register;w.register=function(e,n){if(d&&"loading"===document.readyState&&"string"!=typeof e){var t=document.getElementsByTagName("script"),r=t[t.length-1],i=r&&r.src;if(i){x=e;var o=this;P=setTimeout((function(){T[i]=[e,n],o.import(i)}))}}else x=void 0;return _.call(this,e,n)},w.instantiate=function(n,t){var r=T[n];if(r)return delete T[n],r;var i=this;return new Promise((function(r,o){var c=w.createScript(n);c.addEventListener("error",(function(){o(Error(e(3,[n,t].join(", "))))})),c.addEventListener("load",(function(){if(document.head.removeChild(c),L===n)o(M);else{var e=i.getRegister();e&&e[0]===x&&clearTimeout(P),r(e)}})),document.head.appendChild(c)}))},w.resolve=function(t,r){return u(b,n(t,r=r||a)||t,r)||function(n,t){throw Error(e(8,[n,t].join(", ")))}(t,r)};var J=w.instantiate;w.instantiate=function(e,n){var t=b.depcache[e];if(t)for(var r=0;t.length>r;r++)f(this,this.resolve(t[r],e),e);return J.call(this,e,n)},v&&"function"==typeof importScripts&&(w.instantiate=function(e){var n=this;return Promise.resolve().then((function(){return importScripts(e),n.getRegister()}))})}();
//# sourceMappingURL=s.min.js.map

4

dist/system.js
/*
* SystemJS 6.6.0
* SystemJS 6.6.1
*/

@@ -576,3 +576,3 @@ (function () {

// - https://bugs.webkit.org/show_bug.cgi?id=171566
if (!url.startsWith(baseOrigin + '/'))
if (url.indexOf(baseOrigin + '/'))
script.crossOrigin = 'anonymous';

@@ -579,0 +579,0 @@ var integrity = importMap.integrity[url];

4

dist/system.min.js
/*
* SystemJS 6.6.0
* SystemJS 6.6.1
*/
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_.call(this,e,t)},p&&"function"==typeof importScripts&&(O.instantiate=function(e){var t=this;return Promise.resolve().then((function(){return importScripts(e),t.getRegister()}))}),function(e){function t(t){return!e.hasOwnProperty(t)||!isNaN(t)&&e.length>t||f&&e[t]&&"undefined"!=typeof window&&e[t].parent===window}var n,r,i,o=e.System.constructor.prototype,u=o.import;o.import=function(o,c){return function(){for(var o in n=r=void 0,e)t(o)||(n?r||(r=o):n=o,i=o)}(),u.call(this,o,c)};var c=[[],function(){return{}}],s=o.getRegister;o.getRegister=function(){var o=s.call(this);if(o)return o;var u,f=function(){var o,u=0;for(var c in e)if(!t(c)){if(0===u&&c!==n||1===u&&c!==r)return c;u++,o=c}if(o!==i)return o}();if(!f)return c;try{u=e[f]}catch(a){return c}return[[],function(e){return{execute:function(){e({default:u,__useDefault:!0})}}}]};var f="undefined"!=typeof navigator&&-1!==navigator.userAgent.indexOf("Trident")}("undefined"!=typeof self?self:global),function(t){var 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r;N&&"Module"===n[N]?r=n:(r=Object.assign(Object.create(null),n),N&&Object.defineProperty(r,N,{value:"Module"}));var i=Promise.resolve(r),o=this[S][t]||(this[S][t]={id:t,i:[],h:!1,d:[],e:null,er:void 0,E:void 0});return!o.e&&!o.E&&(Object.assign(o,{n:r,I:void 0,L:void 0,C:i}),r)},O.has=function(e){return!!this[S][e]},O.delete=function(e){var t=this[S],n=t[e];if(!n||null!==n.e||n.E)return!1;var r=n.i;return n.d&&n.d.forEach((function(e){var t=e.i.indexOf(n);-1!==t&&e.i.splice(t,1)})),delete t[e],function(){var n=t[e];if(!n||!r||null!==n.e||n.E)return!1;r.forEach((function(e){n.i.push(e),e(n.n)})),r=null}};var J="undefined"!=typeof Symbol&&Symbol.iterator;O.entries=function(){var e,t,n=this,r=Object.keys(n[S]),i=0,o={next:function(){for(;void 0!==(t=r[i++])&&void 0===(e=n.get(t)););return{done:void 0===t,value:void 0!==t&&[t,e]}}};return o[J]=function(){return this},o}}();
//# sourceMappingURL=system.min.js.map

2

package.json
{
"name": "systemjs",
"version": "6.6.0",
"version": "6.6.1",
"main": "dist/system-node.cjs",

@@ -5,0 +5,0 @@ "exports": {

62

README.md

@@ -8,3 +8,3 @@ # SystemJS

Configurable module loader, running System modules at almost-native speed, and enabling ES module semantics and features such as top-level await, dynamic import, and import maps with full compatibility in older browsers including IE.
Configurable module loader, running System modules at almost-native speed, and enabling ES module semantics and features such as top-level await, dynamic import, and import maps with full compatibility in older browsers including [IE11](#ie11).

@@ -43,7 +43,7 @@ Release Links:

The minimal [2.3KB s.js loader](dist/s.min.js) provides a workflow where code written for production workflows of native ES modules in browsers ([like Rollup code-splitting builds](https://rollupjs.org/guide/en#code-splitting)), can be transpiled to the [System.register module format](docs/system-register.md) to work in older browsers that don't support native modules, including IE11++.
The minimal [2.3KB s.js loader](dist/s.min.js) provides a workflow where code written for production workflows of native ES modules in browsers ([like Rollup code-splitting builds](https://rollupjs.org/guide/en#code-splitting)), can be transpiled to the [System.register module format](docs/system-register.md) to work in older browsers that don't support native modules, including [IE11](#ie11).
Since the ES module semantics such as live bindings, circular references, contextual metadata, dynamic import and top-level await [can all be fully supported this way](docs/system-register.md#semantics), while supporting CSP and cross-origin support, this workflow can be relied upon as a polyfill-like path.
* Support for loading [bare specifier names](docs/import-maps.md) through import maps (formerly package maps, formerly map configuration), loaded via `<script type="systemjs-importmap">` (requires a `fetch` polyfill for eg IE11).
* Support for loading [bare specifier names](docs/import-maps.md) through import maps (formerly package maps, formerly map configuration), loaded via `<script type="systemjs-importmap">`.
* Loads and resolves modules as URLs, throwing for bare specifier names (eg `import 'lodash'`) like the native module loader.

@@ -57,3 +57,3 @@ * Loads System.register modules.

* Support for loading [bare specifier names](docs/import-maps.md) through import maps (formerly package maps, formerly map configuration), loaded via `<script type="systemjs-importmap">` (requires a `fetch` polyfill for eg IE11).
* Support for loading [bare specifier names](docs/import-maps.md) through import maps (formerly package maps, formerly map configuration), loaded via `<script type="systemjs-importmap">`.
* Includes the [global loading extra](#extras) for loading global scripts, useful for loading library dependencies traditionally loaded with script tags.

@@ -185,4 +185,23 @@ * [Tracing hooks](docs/hooks.md#trace-hooks) and [registry deletion API](docs/api.md#registry) for reloading workflows.

#### IE11 Note for External Maps
### IE11 Support
IE11 continues to be fully supported, provided the relevant polyfills are available.
The main required polyfill is a `Promise` polyfill. If using import maps a `fetch` polyfill is also needed.
Both of these can be loaded conditionally using for example using [Bluebird Promises](http://bluebirdjs.com/docs/getting-started.html) and the [GitHub Fetch Polyfill](https://github.github.io/fetch/) over Unpkg:
```html
<script>
if (typeof Promise === 'undefined')
document.write('<script src="https://unpkg.com/bluebird@3.7.2/js/browser/bluebird.core.min.js"><\/script>');
if (typeof fetch === 'undefined')
document.write('<script src="https://unpkg.com/whatwg-fetch@3.4.1/dist/fetch.umd.js"><\/script>');
</script>
```
located _before_ the SystemJS script itself. The above will ensure these polyfills are only fetched for older browsers without `Promise` and `fetch` support.
#### Note on Import Maps Support in IE11
When using external import maps (those with `src=""` attributes), there is an IE11-specific workaround that might need to be used. Browsers should not make a network request when they see `<script type="systemjs-importmap" src="/importmap.json"></script>` during parsing of the initial HTML page. However, IE11 does so. [Codesandbox demonstration](https://codesandbox.io/s/vibrant-black-xiok4?file=/index.html)

@@ -245,35 +264,2 @@

## Polyfills for Older Browsers
### Promises
Both builds of SystemJS need Promises in the environment to work, which aren't supported in older browsers like IE11.
Promises can be conditionally polyfilled using, for example, [Bluebird](http://bluebirdjs.com/docs/getting-started.html) (generally the fastest Promise polyfill):
```html
<script>
if (typeof Promise === 'undefined')
document.write('<script src="node_modules/bluebird/js/browser/bluebird.core.js"><\/script>');
</script>
```
> Generally `document.write` is not recommended when writing web applications, but for this use case
it works really well and will only apply in older browsers anyway.
### Fetch
To support import maps in the system.js build, a fetch polyfill is need. The [GitHub polyfill](https://github.github.io/fetch/) is recommended:
```html
<script>
if (typeof fetch === 'undefined')
document.write('<script src="node_modules/whatwg-fetch/fetch.js"><\/script>');
</script>
```
### Constructable Stylesheets
If using CSS modules, a Constructable Stylesheets polyfill is needed - [see the module types documentation](docs/module-types.md#constructable-style-sheets-polyfill) for further info.
## Contributing to SystemJS

@@ -280,0 +266,0 @@ 

dist/s.min.js.map

Sorry, the diff of this file is not supported yet

dist/system.min.js.map

Sorry, the diff of this file is not supported yet

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