chore: update snapshots

2026-03-10 08:31:19 +00:00 · 2019-11-18 19:29:58 +01:00
parent 7a75f304ce
commit df996de83a
296 changed files with 5522 additions and 5623 deletions
--- a/.eslintignore
+++ b/.eslintignore
@@ -6,5 +6,6 @@ stats.html
 /packages/import-maps-generate/test/assets/**/node_modules
 /packages/**/test/**/snapshots
 /packages/es-dev-server/test/fixtures/**/*
+/packages/es-dev-server/demo/**/*
 /packages/karma-esm/src/esm-debug.html
 /packages/karma-esm/src/esm-context.html
--- a/.prettierignore
+++ b/.prettierignore
@@ -6,6 +6,7 @@ stats.html
 packages/semantic-dom-diff/bundle/get-diffable-html.js
 packages/**/test/**/snapshots
 /packages/es-dev-server/test/fixtures/**/*
+/packages/es-dev-server/demo/**/*
 /packages/karma-esm/src/test-loader-browser-script.js
 /packages/karma-esm/src/esm-debug.html
 /packages/karma-esm/src/esm-context.html
--- a/snapshots/BDD.md
+++ b/snapshots/BDD.md
@@ -1,13 +0,0 @@
-# `BDD`
-
-#### `uses chai dom equals plugin snapshot`
-
-```html
-<div>
-  <h1>
-    Hey
-  </h1>
-</div>
-
-```
-
--- a/semantic-dom-diff.md
+++ b/semantic-dom-diff.md
@@ -10,3 +10,4 @@
 </div>

 ```
+
--- a/snapshots/Plugin
+++ b/snapshots/Plugin
@@ -0,0 +1,14 @@
+# `Plugin - sinon-chai`
+
+#### `can expect a spys callCount`
+
+```html
+<h1>
+  My Element
+</h1>
+<p>
+  hello world!
+</p>
+
+```
+
--- a/snapshots/component-a.md
+++ b/snapshots/component-a.md
@@ -8,12 +8,14 @@
 <div>
  A
 </div>
+
 ```

 ```html
 <div>
  A
 </div>
+
 ```

 ####   `matches a dom element snapshot`
@@ -22,12 +24,14 @@
 <div>
  B
 </div>
+
 ```

 ```html
 <div>
  B
 </div>
+
 ```

 ####   `matches a dom element snapshot, using .dom`
@@ -36,12 +40,14 @@
 <div>
  C
 </div>
+
 ```

 ```html
 <div>
  C
 </div>
+
 ```

 ## `error states`
@@ -52,12 +58,14 @@
 <span>
  A
 </span>
+
 ```

 ```html
 <span>
  A
 </span>
+
 ```

 ####   `matches shadow dom snapshot`
@@ -66,12 +74,14 @@
 <span>
  B
 </span>
+
 ```

 ```html
 <span>
  B
 </span>
+
 ```

 ## `failed snapshots`
@@ -80,28 +90,30 @@

 ```html
 <div>
-  0.6523866720855873
+  0.2201823757011796
 </div>
+
 ```

 ```html
 <div>
-  0.1401241753470146
+  0.2201823757011796
 </div>
+
 ```

 ####   `does not throw an error when a snapshot does not match using negate`

 ```html
 <div>
-  0.2129255588205312
+  0.7065918062901237
 </div>

 ```

 ```html
 <div>
-  0.2129255588205312
+  0.7065918062901237
 </div>

 ```
--- a/snapshots/component-b.md
+++ b/snapshots/component-b.md
@@ -8,10 +8,11 @@
 <div>
  A
 </div>
+
 ```

 ```html
-<div random-attribute="0.5954442939066347">
+<div>
  A
 </div>

@@ -25,15 +26,13 @@
 <div>
  A
 </div>
+
 ```

 ```html
 <div>
  A
 </div>
-<span>
-  B
-</span>

 ```

--- a/snapshots/my-element.md
+++ b/snapshots/my-element.md
@@ -0,0 +1,14 @@
+# `my-element`
+
+#### `renders correctly`
+
+```html
+<h1>
+  My Element
+</h1>
+<p>
+  hello world!
+</p>
+
+```
+
--- a/packages/building-utils/package.json
+++ b/packages/building-utils/package.json
@@ -29,15 +29,15 @@
    "utils"
  ],
  "dependencies": {
-    "@babel/core": "^7.3.3",
+    "@babel/core": "^7.7.2",
    "@babel/plugin-syntax-dynamic-import": "^7.2.0",
    "@webcomponents/webcomponentsjs": "^2.2.10",
    "arrify": "^2.0.1",
-    "browserslist": "^4.5.6",
+    "browserslist": "^4.7.2",
    "chokidar": "^3.0.0",
    "clean-css": "^4.2.1",
    "clone": "^2.1.2",
-    "core-js-bundle": "^3.1.4",
+    "core-js-bundle": "^3.4.0",
    "deepmerge": "^3.2.0",
    "es-module-shims": "^0.4.5",
    "html-minifier": "^4.0.0",
@@ -60,4 +60,4 @@
    "chai": "^4.2.0",
    "mocha": "^6.0.0"
  }
-}
+}
--- a/packages/building-utils/test/index-html/snapshots/create-index-html/dynamic-import.html
+++ b/packages/building-utils/test/index-html/snapshots/create-index-html/dynamic-import.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script>!function(){var n,o,e=[];function i(){window.importShim("./app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&e.push((n="polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",o=!1,new Promise(function(e,i){document.head.appendChild(Object.assign(document.createElement("script"),{src:n,onload:e,onerror:i},o?{type:"module"}:void 0))}))),e.length?Promise.all(e).then(i):i()}();</script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script>!function(){var n,o,e=[];function i(){window.importShim("./app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&e.push((n="polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",o=!1,new Promise((function(e,i){document.head.appendChild(Object.assign(document.createElement("script"),{src:n,onload:e,onerror:i},o?{type:"module"}:void 0))})))),e.length?Promise.all(e).then(i):i()}();</script></body></html>
--- a/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-core-js.html
+++ b/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-core-js.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script src="./app.js" type="module"></script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="./app.js" type="module"></script></body></html>
--- a/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-multiple-legacy.html
+++ b/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-multiple-legacy.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script>!function(){function e(e,t){return new Promise(function(o,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:o,onerror:n},t?{type:"module"}:void 0))})}var t=[];function o(){"noModule"in HTMLScriptElement.prototype?window.importShim("./app.js"):System.import("./legacy/app.js")}"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||t.push(e("polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&t.push(e("polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js",!1)),t.length?Promise.all(t).then(o):o()}();</script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script>!function(){function e(e,t){return new Promise((function(o,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:o,onerror:n},t?{type:"module"}:void 0))}))}var t=[];function o(){"noModule"in HTMLScriptElement.prototype?window.importShim("./app.js"):System.import("./legacy/app.js")}"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||t.push(e("polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&t.push(e("polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js",!1)),t.length?Promise.all(t).then(o):o()}();</script></body></html>
--- a/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-multiple.html
+++ b/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-multiple.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script src="polyfills/custom-b.36a50cce88edee34c249d0276be6531d.js" nomodule=""></script><script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script>!function(){function e(e,o){return new Promise(function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))})}var o=[];function t(){window.importShim("./app.js")}"foo"in window&&o.push(e("polyfills/custom-a.612310cce7c28a680112cc9eff6ef77c.js",!1)),"fetch"in window||o.push(e("polyfills/fetch.25d91ed49dc86803b0aa17858b018737.js",!1)),"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js",!1)),o.length?Promise.all(o).then(t):t()}();</script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script src="polyfills/custom-b.36a50cce88edee34c249d0276be6531d.js" nomodule=""></script><script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script>!function(){function e(e,o){return new Promise((function(t,c){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:c},o?{type:"module"}:void 0))}))}var o=[];function t(){window.importShim("./app.js")}"foo"in window&&o.push(e("polyfills/custom-a.612310cce7c28a680112cc9eff6ef77c.js",!1)),"fetch"in window||o.push(e("polyfills/fetch.e0fa1d30ce1c9b23c0898a2e34c3fe3b.js",!1)),"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js",!1)),o.length?Promise.all(o).then(t):t()}();</script></body></html>
--- a/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-wc.html
+++ b/packages/building-utils/test/index-html/snapshots/create-index-html/polyfill-wc.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>!function(){function e(e,o){return new Promise(function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))})}var o=[];function t(){window.importShim("./app.js")}"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js",!1)),o.length?Promise.all(o).then(t):t()}();</script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>!function(){function e(e,o){return new Promise((function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))}))}var o=[];function t(){window.importShim("./app.js")}"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js",!1)),o.length?Promise.all(o).then(t):t()}();</script></body></html>
--- a/packages/building-utils/test/index-html/snapshots/create-index-html/system.html
+++ b/packages/building-utils/test/index-html/snapshots/create-index-html/system.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script"><link rel="preload" href="shared.js" as="script"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>["./app.js","./shared.js"].forEach(function(s){System.import(s)});</script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script"><link rel="preload" href="shared.js" as="script"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>["./app.js","./shared.js"].forEach((function(s){System.import(s)}));</script></body></html>
--- a/packages/es-dev-server/TODO.md
+++ b/packages/es-dev-server/TODO.md
@@ -0,0 +1,2 @@
+- update karma-esm
+- add polyfills flag
--- a/packages/es-dev-server/demo/compatibility/index.html
+++ b/packages/es-dev-server/demo/compatibility/index.html
@@ -0,0 +1,56 @@
+<html>
+
+<head>
+  <base href="/packages/es-dev-server/demo/compatibility/">
+</head>
+
+<body>
+  <img width="100" src="../logo.png">
+
+  <h1>Demo app</h1>
+
+  <p>
+
+    <a href="foo/">Foo</a>
+  </p>
+
+  <p>
+    <a href="bar/">Bar</a>
+  </p>
+</body>
+
+<script type="module" src="./module-features.js"></script>
+<script type="module" src="./stage-4-features.js"></script>
+<script type="module" src="./stage-3-features.js"></script>
+
+<script type="module">
+  /* eslint-disable */
+
+  // object rest/spread
+  const foo = { a: 1 };
+  const bar = { ...foo };
+  console.log(bar);
+
+  // async function
+  async function asyncFunction() {
+    console.log('async function');
+  }
+  asyncFunction();
+
+  // exponentiation
+  console.log(2 ** 4);
+
+  // classes
+  class Foo {
+    constructor() {
+      console.log('foo class');
+    }
+  }
+  new Foo();
+
+  // template literal
+  console.log(`template ${'literal'}`);
+
+</script>
+
+</html>
--- a/packages/es-dev-server/demo/compatibility/module-features-a.js
+++ b/packages/es-dev-server/demo/compatibility/module-features-a.js
@@ -0,0 +1 @@
+console.log('statically imported module');
--- a/packages/es-dev-server/demo/compatibility/module-features-b.js
+++ b/packages/es-dev-server/demo/compatibility/module-features-b.js
@@ -0,0 +1 @@
+console.log('dynamically imported module');
--- a/packages/es-dev-server/demo/compatibility/module-features.js
+++ b/packages/es-dev-server/demo/compatibility/module-features.js
@@ -0,0 +1,5 @@
+import './module-features-a.js';
+
+import('./module-features-b.js');
+
+console.log('import.meta.url', import.meta.url);
--- a/packages/es-dev-server/demo/compatibility/server.js
+++ b/packages/es-dev-server/demo/compatibility/server.js
@@ -0,0 +1,7 @@
+module.exports = {
+  rootDir: '../../',
+  appIndex: 'packages/es-dev-server/demo/compatibility/index.html',
+  nodeResolve: true,
+  open: true,
+  watch: true,
+};
--- a/packages/es-dev-server/demo/compatibility/stage-3-class-fields.js
+++ b/packages/es-dev-server/demo/compatibility/stage-3-class-fields.js
@@ -0,0 +1,5 @@
+class ClassFields {
+  myField = 'foo';
+}
+
+console.log(new ClassFields().myField);
--- a/packages/es-dev-server/demo/compatibility/stage-3-features.js
+++ b/packages/es-dev-server/demo/compatibility/stage-3-features.js
@@ -0,0 +1,8 @@
+console.log(
+  'dynamically importing stage 3 features, these should throw errors on browsers that dont support them but it should not crash babel parsing',
+);
+
+import('./stage-3-class-fields.js');
+import('./stage-3-optional-chaining.js');
+import('./stage-3-private-class-fields.js');
+import('./stage-3-nullish-coalesc.js');
--- a/packages/es-dev-server/demo/compatibility/stage-3-nullish-coalesc.js
+++ b/packages/es-dev-server/demo/compatibility/stage-3-nullish-coalesc.js
@@ -0,0 +1,3 @@
+const foo = null;
+
+console.log(foo ?? 'nullish colaesced');
--- a/packages/es-dev-server/demo/compatibility/stage-3-optional-chaining.js
+++ b/packages/es-dev-server/demo/compatibility/stage-3-optional-chaining.js
@@ -0,0 +1,3 @@
+const foo = {};
+
+console.log('optional chaining', foo?.bar?.buz);
--- a/packages/es-dev-server/demo/compatibility/stage-3-private-class-fields.js
+++ b/packages/es-dev-server/demo/compatibility/stage-3-private-class-fields.js
@@ -0,0 +1,11 @@
+class PrivateClassFields {
+  #foo = 'bar';
+
+  #bar() {
+    return this.#foo;
+  }
+
+  bar() {
+    return this.#bar();
+  }
+}
--- a/packages/es-dev-server/demo/compatibility/stage-4-features.js
+++ b/packages/es-dev-server/demo/compatibility/stage-4-features.js
@@ -0,0 +1,24 @@
+// object rest/spread
+const foo = { a: 1 };
+const bar = { ...foo };
+console.log(bar);
+
+// async function
+async function asyncFunction() {
+  console.log('async function');
+}
+asyncFunction();
+
+// exponentiation
+console.log(2 ** 4);
+
+// classes
+class Foo {
+  constructor() {
+    console.log('foo class');
+  }
+}
+new Foo();
+
+// template literal
+console.log(`template ${'literal'}`);
--- a/packages/es-dev-server/package.json
+++ b/packages/es-dev-server/package.json
@@ -25,6 +25,9 @@
    "generate-certificates": "node scripts/generate-certificates.js",
    "prepublishOnly": "npm run build && ../../scripts/insert-header.js",
    "start": "yarn build && node dist/cli.js --app-index demo/import-map/index.html --open --watch",
+    "start:compatibility": "yarn build && node dist/cli.js -c demo/compatibility/server.js",
+    "start:compatibility:min": "yarn build && node dist/cli.js -c demo/compatibility/server.js --compatibility min",
+    "start:compatibility:max": "yarn build && node dist/cli.js -c demo/compatibility/server.js --compatibility max",
    "start:babel": "yarn build && node dist/cli.js --app-index demo/babel/index.html --open --watch --babel",
    "start:base-path": "yarn build && node dist/cli.js --app-index demo/base-path/index.html --base-path /my-base-path --node-resolve --watch --open",
    "start:base-path-compat": "yarn build && node dist/cli.js --app-index demo/base-path/index.html --base-path /my-base-path --node-resolve --compatibility all --watch --open",
@@ -62,13 +65,22 @@
    "polyfill"
  ],
  "dependencies": {
-    "@babel/core": "^7.3.3",
+    "@babel/core": "^7.7.2",
+    "@babel/plugin-proposal-dynamic-import": "^7.7.0",
+    "@babel/plugin-syntax-class-properties": "^7.2.0",
    "@babel/plugin-syntax-import-meta": "^7.2.0",
-    "@babel/preset-env": "^7.0.0",
+    "@babel/plugin-syntax-nullish-coalescing-operator": "^7.2.0",
+    "@babel/plugin-syntax-numeric-separator": "^7.2.0",
+    "@babel/plugin-syntax-optional-chaining": "^7.2.0",
+    "@babel/preset-env": "^7.7.1",
    "@open-wc/building-utils": "^2.10.2",
    "@types/minimatch": "^3.0.3",
    "babel-plugin-bare-import-rewrite": "^1.5.1",
+    "browserslist": "^4.7.2",
+    "browserslist-useragent": "^3.0.2",
    "camelcase": "^5.3.1",
+    "caniuse-api": "^3.0.0",
+    "caniuse-lite": "^1.0.30001008",
    "chokidar": "^3.0.0",
    "command-line-args": "^5.0.2",
    "command-line-usage": "^5.0.5",
@@ -88,22 +100,22 @@
    "portfinder": "^1.0.21",
    "resolve": "^1.11.1",
    "strip-ansi": "^5.2.0",
+    "useragent": "^2.3.0",
    "whatwg-url": "^7.0.0"
  },
  "devDependencies": {
-    "@babel/cli": "^7.2.3",
-    "@babel/plugin-proposal-class-properties": "^7.3.4",
-    "@babel/plugin-proposal-decorators": "^7.4.4",
-    "@babel/plugin-transform-modules-systemjs": "^7.5.0",
-    "@babel/preset-typescript": "^7.3.3",
-    "@babel/register": "^7.0.0",
+    "@babel/cli": "^7.7.0",
+    "@babel/plugin-proposal-class-properties": "^7.7.0",
+    "@babel/plugin-proposal-decorators": "^7.7.0",
+    "@babel/plugin-transform-modules-systemjs": "^7.7.0",
+    "@babel/preset-typescript": "^7.7.2",
+    "@babel/register": "^7.7.0",
    "@types/koa": "^2.0.48",
    "@types/koa-static": "^4.0.1",
    "@types/lru-cache": "^5.1.0",
    "@types/node-fetch": "^2.3.7",
    "@types/request": "^2.48.1",
    "abort-controller": "^3.0.0",
-    "babel-preset-typescript": "^7.0.0-alpha.19",
    "chai": "^4.2.0",
    "koa-proxies": "^0.8.1",
    "lit-element": "^2.0.1",
@@ -116,4 +128,4 @@
    "sinon": "^7.4.1",
    "uuid": "^3.3.2"
  }
-}
+}
--- a/packages/es-dev-server/src/browser-scripts/system-js-legacy-resolve.js
+++ b/packages/es-dev-server/src/browser-scripts/system-js-legacy-resolve.js
@@ -1,12 +0,0 @@
-export default `
-<script nomodule>
-  // appends a query param to each systemjs request to trigger es5 compilation
-  var originalResolve = System.constructor.prototype.resolve;
-  System.constructor.prototype.resolve = function () {
-    return Promise.resolve(originalResolve.apply(this, arguments))
-      .then(function (url) {
-        return url + '?legacy=true';
-      });
-  };
-</script>
-`;
--- a/packages/es-dev-server/src/config.js
+++ b/packages/es-dev-server/src/config.js
@@ -105,7 +105,6 @@ export function createConfig(config) {
    babelExclude = [],
    babelModernExclude = [],
    basePath,
-    compatibility = compatibilityModes.NONE,
    compress = true,
    fileExtensions = [],
    hostname,
@@ -122,6 +121,17 @@ export function createConfig(config) {
    responseTransformers,
  } = config;

+  let { compatibility = compatibilityModes.AUTO } = config;
+
+  if (compatibility === 'modern' || compatibility === 'all') {
+    /* eslint-disable-next-line no-console */
+    console.warn(
+      '[es-dev-server] Compatibility mode "modern" and "all" are deprecated, and combined into "auto".' +
+        '"auto" mode is turned on by default.',
+    );
+    compatibility = compatibilityModes.AUTO;
+  }
+
  // middlewares used to be called customMiddlewares
  // @ts-ignore
  const middlewares = config.middlewares || config.customMiddlewares;
--- a/packages/es-dev-server/src/constants.js
+++ b/packages/es-dev-server/src/constants.js
@@ -1,10 +1,10 @@
 export const compatibilityModes = {
  NONE: 'none',
-  ESM: 'esm',
-  MODERN: 'modern',
-  ALL: 'all',
+  AUTO: 'auto',
+  MIN: 'min',
+  MAX: 'max',
 };

-export const messageChannelEndpoint = '/__es-dev-server-message-channel__';
+export const virtualFilePrefix = '/__es-dev-server__/';

-export const baseFileExtensions = ['.mjs', '.js'];
+export const messageChannelEndpoint = `${virtualFilePrefix}message-channel`;
--- a/packages/es-dev-server/src/create-middlewares.js
+++ b/packages/es-dev-server/src/create-middlewares.js
@@ -3,7 +3,7 @@ import koaEtag from 'koa-etag';
 import koaCompress from 'koa-compress';
 import { createBasePathMiddleware } from './middleware/base-path.js';
 import { createHistoryAPIFallbackMiddleware } from './middleware/history-api-fallback.js';
-import { createCompileMiddleware } from './middleware/compile-middleware.js';
+import { createCompatibilityMiddleware } from './middleware/compatibility-middleware.js';
 import { createWatchServedFilesMiddleware } from './middleware/watch-served-files.js';
 import { createTransformIndexHTMLMiddleware } from './middleware/transform-index-html.js';
 import { createMessageChannelMiddleware } from './middleware/message-channel.js';
@@ -33,7 +33,6 @@ export function createMiddlewares(config, fileWatcher) {
    appIndex,
    appIndexDir,
    babelExclude,
-    babelModernExclude,
    basePath,
    compatibilityMode,
    compress,
@@ -67,9 +66,7 @@ export function createMiddlewares(config, fileWatcher) {
  }

  const setupBabel =
-    customBabelConfig ||
-    [compatibilityModes.ALL, compatibilityModes.MODERN].includes(compatibilityMode) ||
-    readUserBabelConfig;
+    customBabelConfig || compatibilityMode !== compatibilityModes.NONE || readUserBabelConfig;
  const setupCompatibility = compatibilityMode && compatibilityMode !== compatibilityModes.NONE;
  const setupTransformIndexHTML = nodeResolve || setupBabel || setupCompatibility;
  const setupHistoryFallback = appIndex;
@@ -114,7 +111,7 @@ export function createMiddlewares(config, fileWatcher) {
  // compile code using babel and/or resolve module imports
  if (setupBabel || nodeResolve) {
    middlewares.push(
-      createCompileMiddleware({
+      createCompatibilityMiddleware({
        rootDir,
        moduleDirectories,
        readUserBabelConfig,
@@ -122,7 +119,6 @@ export function createMiddlewares(config, fileWatcher) {
        extraFileExtensions,
        customBabelConfig,
        babelExclude,
-        babelModernExclude,
        nodeResolve,
        preserveSymlinks,
      }),
--- a/packages/es-dev-server/src/middleware/compatibility-middleware.js
+++ b/packages/es-dev-server/src/middleware/compatibility-middleware.js
@@ -0,0 +1,102 @@
+import stripAnsi from 'strip-ansi';
+import { DEFAULT_EXTENSIONS } from '@babel/core';
+import { getBodyAsString, getRequestFilePath, isPolyfill } from '../utils/utils.js';
+import { sendMessageToActiveBrowsers } from '../utils/message-channel.js';
+import { ResolveSyntaxError } from '../utils/resolve-module-imports.js';
+import { createCompatibilityTransform } from '../utils/compatibility-transform.js';
+import { getUserAgentCompat } from '../utils/user-agent-compat.js';
+
+/**
+ * @typedef {object} CompatibilityMiddlewareConfig
+ * @property {string} rootDir
+ * @property {string[]} moduleDirectories
+ * @property {boolean} readUserBabelConfig
+ * @property {boolean} nodeResolve
+ * @property {string} compatibilityMode
+ * @property {object} [customBabelConfig]
+ * @property {string[]} extraFileExtensions
+ * @property {string[]} babelExclude
+ * @property {boolean} preserveSymlinks
+ */
+
+/**
+ * @param {string} errorMessage
+ */
+function logError(errorMessage) {
+  // strip babel ansi color codes because they're not colored correctly for the browser terminal
+  sendMessageToActiveBrowsers('error-message', JSON.stringify(stripAnsi(errorMessage)));
+
+  /* eslint-disable-next-line no-console */
+  console.error(`\n${errorMessage}`);
+}
+
+/**
+ * Sets up a middleware which runs all served js code through babel. Different babel configs
+ * are loaded based on the server's configuration.
+ *
+ * @param {CompatibilityMiddlewareConfig} cfg
+ */
+export function createCompatibilityMiddleware(cfg) {
+  const fileExtensions = [...DEFAULT_EXTENSIONS, ...cfg.extraFileExtensions];
+  const compatibilityTransform = createCompatibilityTransform(cfg);
+
+  /** @type {import('koa').Middleware} */
+  async function compatibilityMiddleware(ctx, next) {
+    const baseURL = ctx.url.split('?')[0].split('#')[0];
+    if (isPolyfill(ctx.url) || !fileExtensions.some(ext => baseURL.endsWith(ext))) {
+      return next();
+    }
+    await next();
+
+    // should be a 2xx response
+    if (ctx.status < 200 || ctx.status >= 300) {
+      return undefined;
+    }
+
+    const filePath = getRequestFilePath(ctx, cfg.rootDir);
+
+    // Ensure we respond with js content type
+    ctx.response.set('content-type', 'text/javascript');
+
+    try {
+      const code = await getBodyAsString(ctx);
+      const uaCompat = getUserAgentCompat(ctx);
+      const transformedCode = await compatibilityTransform({
+        uaCompat,
+        filePath,
+        code,
+      });
+      ctx.body = transformedCode;
+      ctx.status = 200;
+      return undefined;
+    } catch (error) {
+      // ResolveSyntaxError is thrown when resolveModuleImports runs into a syntax error from
+      // the lexer, but babel didn't see any errors. this means either a bug in the lexer, or
+      // some experimental syntax. log a message and return the module untransformed to the
+      // browser
+      if (error instanceof ResolveSyntaxError) {
+        logError(
+          `Could not resolve module imports in ${ctx.url}: Unable to parse the module, this can be due to experimental syntax or a bug in the parser.`,
+        );
+        return undefined;
+      }
+
+      let errorMessage = error.message;
+
+      // replace babel error messages file path with the request url for readability
+      if (errorMessage.startsWith(filePath)) {
+        errorMessage = errorMessage.replace(filePath, ctx.url);
+      }
+
+      errorMessage = `Error compiling: ${errorMessage}`;
+
+      // send compile error to browser for logging
+      ctx.body = errorMessage;
+      ctx.status = 500;
+      logError(errorMessage);
+    }
+    return undefined;
+  }
+
+  return compatibilityMiddleware;
+}
--- a/packages/es-dev-server/src/middleware/compile-middleware.js
+++ b/packages/es-dev-server/src/middleware/compile-middleware.js
@@ -1,164 +0,0 @@
-import minimatch from 'minimatch';
-import stripAnsi from 'strip-ansi';
-import { getBodyAsString, getRequestFilePath, isPolyfill } from '../utils/utils.js';
-import { compatibilityModes, baseFileExtensions } from '../constants.js';
-import { sendMessageToActiveBrowsers } from '../utils/message-channel.js';
-import { resolveModuleImports, ResolveSyntaxError } from '../utils/resolve-module-imports.js';
-import createBabelCompiler from '../utils/babel-compiler.js';
-
-/**
- * @typedef {object} CompileMiddlewareConfig
- * @property {string} rootDir
- * @property {string[]} moduleDirectories
- * @property {boolean} readUserBabelConfig
- * @property {boolean} nodeResolve
- * @property {string} compatibilityMode
- * @property {object} [customBabelConfig]
- * @property {string[]} extraFileExtensions
- * @property {string[]} babelModernExclude patterns to exclude from modern babel compilation
- * @property {string[]} babelExclude patterns to exclude from all babel compilation
- * @property {boolean} preserveSymlinks
- */
-
-/**
- * Returns whether we should compile this file with babel.
- * @param {string} file
- * @param {boolean} legacy
- * @param {CompileMiddlewareConfig} cfg
- */
-function shouldBabelCompile(file, legacy, cfg) {
-  if (cfg.babelExclude.some(pattern => minimatch(file, pattern))) {
-    return false;
-  }
-
-  return legacy || !cfg.babelModernExclude.some(pattern => minimatch(file, pattern));
-}
-
-/**
- * Creates babel compilers based on the configuration
- * @param {CompileMiddlewareConfig} cfg
- */
-function createBabelCompilers(cfg) {
-  // create the default compiler, enable the modern config if all or modern compatibility mode is on
-  const compileModern = [compatibilityModes.MODERN, compatibilityModes.ALL].includes(
-    cfg.compatibilityMode,
-  );
-  const compileDefault = compileModern || cfg.customBabelConfig || cfg.readUserBabelConfig;
-  const compileLegacy = cfg.compatibilityMode === compatibilityModes.ALL;
-
-  const defaultCompiler = compileDefault
-    ? createBabelCompiler({ ...cfg, modern: compileModern, legacy: false })
-    : null;
-  const legacy = compileLegacy
-    ? createBabelCompiler({ readUserBabelConfig: false, modern: false, legacy: true })
-    : null;
-
-  return { defaultCompiler, legacy };
-}
-
-/**
- * @param {string} errorMessage
- */
-function logError(errorMessage) {
-  // strip babel ansi color codes because they're not colored correctly for the browser terminal
-  sendMessageToActiveBrowsers('error-message', JSON.stringify(stripAnsi(errorMessage)));
-
-  /* eslint-disable-next-line no-console */
-  console.error(`\n${errorMessage}`);
-}
-
-/**
- * Sets up a middleware which runs all served js code through babel. Different babel configs
- * are loaded based on the server's configuration.
- *
- * @param {CompileMiddlewareConfig} cfg
- */
-export function createCompileMiddleware(cfg) {
-  const fileExtensions = [...baseFileExtensions, ...cfg.extraFileExtensions];
-  const babelCompilers = createBabelCompilers(cfg);
-
-  /** @type {import('koa').Middleware} */
-  async function compileMiddleware(ctx, next) {
-    const baseURL = ctx.url.split('?')[0].split('#')[0];
-    if (isPolyfill(ctx.url) || !fileExtensions.some(ext => baseURL.endsWith(ext))) {
-      return next();
-    }
-    await next();
-
-    // should be a 2xx response
-    if (ctx.status < 200 || ctx.status >= 300) {
-      return undefined;
-    }
-
-    const filePath = getRequestFilePath(ctx, cfg.rootDir);
-
-    // we use the legacy compiler if the request ends with a legacy paramter
-    const legacy = ctx.url.endsWith('?legacy=true');
-    if (legacy && !babelCompilers.legacy) {
-      logError(`Set compatibility mode to 'all' to compile for legacy browsers.`);
-      return undefined;
-    }
-
-    // Ensure we respond with js content type
-    ctx.response.set('content-type', 'text/javascript');
-
-    try {
-      const babelCompile = shouldBabelCompile(filePath, legacy, cfg);
-
-      let code = await getBodyAsString(ctx);
-
-      // do the default babel compilation, if configured
-      if (babelCompile && babelCompilers.defaultCompiler) {
-        code = await babelCompilers.defaultCompiler(filePath, code);
-      }
-
-      // resolve module imports, this isn't a babel plugin because if only node-resolve is configured,
-      // we don't need to run babel which makes it a lot faster
-      if (cfg.nodeResolve) {
-        code = await resolveModuleImports(cfg.rootDir, filePath, code, {
-          fileExtensions,
-          moduleDirectories: cfg.moduleDirectories,
-          preserveSymlinks: cfg.preserveSymlinks,
-        });
-      }
-
-      // if this is a legacy request, compile to systemjs and es5. this isn't done in the first
-      // babel pass, because we need valid es module syntax to resolve module imports first
-      if (babelCompile && legacy) {
-        code = await babelCompilers.legacy(filePath, code);
-      }
-
-      ctx.body = code;
-      ctx.status = 200;
-      return undefined;
-    } catch (error) {
-      // ResolveSyntaxError is thrown when resolveModuleImports runs into a syntax error from
-      // the lexer, but babel didn't see any errors. this means either a bug in the lexer, or
-      // some experimental syntax. log a message and return the module untransformed to the
-      // browser
-      if (error instanceof ResolveSyntaxError) {
-        logError(
-          `Could not resolve module imports in ${ctx.url}: Unable to parse the module, this can be due to experimental syntax or a bug in the parser.`,
-        );
-        return undefined;
-      }
-
-      let errorMessage = error.message;
-
-      // replace babel error messages file path with the request url for readability
-      if (errorMessage.startsWith(filePath)) {
-        errorMessage = errorMessage.replace(filePath, ctx.url);
-      }
-
-      errorMessage = `Error compiling: ${errorMessage}`;
-
-      // send compile error to browser for logging
-      ctx.body = errorMessage;
-      ctx.status = 500;
-      logError(errorMessage);
-    }
-    return undefined;
-  }
-
-  return compileMiddleware;
-}
--- a/packages/es-dev-server/src/middleware/response-cache-middleware.js
+++ b/packages/es-dev-server/src/middleware/response-cache-middleware.js
@@ -1,8 +1,8 @@
 /* eslint-disable no-restricted-syntax */
 import LRUCache from 'lru-cache';
 import fs from 'fs';
+import { DEFAULT_EXTENSIONS } from '@babel/core';
 import { promisify } from 'util';
-import { baseFileExtensions } from '../constants.js';
 import { getBodyAsString, getRequestFilePath, isGeneratedFile } from '../utils/utils.js';

 const stat = promisify(fs.stat);
@@ -22,6 +22,14 @@ const stat = promisify(fs.stat);
 * @property {number} lastModified
 */

+/**
+ * Cache by user agent + file path, so that there can be unique transforms
+ * per browser.
+ */
+function createCacheKey(ctx) {
+  return `${ctx.get('user-agent')}${ctx.url}`;
+}
+
 /**
 * @param {string} path
 * @returns {Promise<number>}
@@ -39,10 +47,10 @@ async function getLastModified(path) {
 * @param {ResponseCacheMiddlewareConfig} cfg
 */
 export function createResponseCacheMiddleware(cfg) {
-  const fileExtensions = [...baseFileExtensions, ...cfg.extraFileExtensions];
+  const fileExtensions = [...DEFAULT_EXTENSIONS, ...cfg.extraFileExtensions];

  /** @type {Map<String, String>} */
-  const urlForFilePaths = new Map();
+  const cacheKeysForFilePaths = new Map();

  /** @type {import('lru-cache')<string, CacheEntry>} */
  const cache = new LRUCache({
@@ -51,10 +59,10 @@ export function createResponseCacheMiddleware(cfg) {
    // don't call dispose on overwriting
    noDisposeOnSet: true,
    // remove file path -> url mapping when we are no longer caching it
-    dispose(url) {
-      for (const [filePath, urlForFilePath] of urlForFilePaths.entries()) {
-        if (urlForFilePath === url) {
-          urlForFilePaths.delete(filePath);
+    dispose(cacheKey) {
+      for (const [filePath, cacheKeyForFilePath] of cacheKeysForFilePaths.entries()) {
+        if (cacheKeyForFilePath === cacheKey) {
+          cacheKeysForFilePaths.delete(filePath);
          return;
        }
      }
@@ -63,15 +71,16 @@ export function createResponseCacheMiddleware(cfg) {

  // remove file from cache on change
  cfg.fileWatcher.addListener('change', e => {
-    const filePath = urlForFilePaths.get(e);
-    if (filePath) {
-      cache.del(filePath);
+    const cacheKey = cacheKeysForFilePaths.get(e);
+    if (cacheKey) {
+      cache.del(cacheKey);
    }
  });

  /** @type {import('koa').Middleware} */
  async function responseCacheMiddleware(ctx, next) {
-    const cached = cache.get(ctx.url);
+    const cacheKey = createCacheKey(ctx);
+    const cached = cache.get(cacheKey);
    if (cached) {
      // we watch files, and remove them on change, but there can be edge cases
      // where these events do not come through properly (the file system is a 'live' system)
@@ -84,7 +93,7 @@ export function createResponseCacheMiddleware(cfg) {
      }

      // remove file from cache if it changed in the meantime, and serve regularly
-      cache.del(ctx.url);
+      cache.del(cacheKey);
    }

    await next();
@@ -104,8 +113,8 @@ export function createResponseCacheMiddleware(cfg) {

    const body = await getBodyAsString(ctx);
    const filePath = getRequestFilePath(ctx, cfg.rootDir);
-    urlForFilePaths.set(filePath, ctx.url);
-    cache.set(ctx.url, {
+    cacheKeysForFilePaths.set(filePath, ctx.url);
+    cache.set(cacheKey, {
      body,
      headers: ctx.response.headers,
      filePath,
--- a/packages/es-dev-server/src/middleware/transform-index-html.js
+++ b/packages/es-dev-server/src/middleware/transform-index-html.js
@@ -8,6 +8,8 @@ import {
  toBrowserPath,
  isInlineModule,
 } from '../utils/utils.js';
+import { getUserAgentCompat } from '../utils/user-agent-compat.js';
+import { compatibilityModes } from '../constants.js';

 /**
 * @typedef {object} TransformIndexHTMLMiddlewareConfig
@@ -40,6 +42,11 @@ export function createTransformIndexHTMLMiddleware(cfg) {

  /** @type {import('koa').Middleware} */
  async function transformIndexHTMLMiddleware(ctx, next) {
+    const uaCompat = getUserAgentCompat(ctx);
+    if (cfg.compatibilityMode === compatibilityModes.AUTO && uaCompat.modern) {
+      return next();
+    }
+
    // serve polyfill from memory if url matches
    const polyfill = polyfills.get(ctx.url);
    if (polyfill) {
@@ -47,7 +54,7 @@ export function createTransformIndexHTMLMiddleware(cfg) {
      // aggresively cache polyfills, they are hashed so content changes bust the cache
      ctx.response.set('cache-control', 'public, max-age=31536000');
      ctx.response.set('content-type', 'text/javascript');
-      return;
+      return undefined;
    }

    /**
@@ -74,14 +81,14 @@ export function createTransformIndexHTMLMiddleware(cfg) {
      ctx.response.set('content-type', 'text/javascript');
      ctx.response.set('cache-control', 'no-cache');
      ctx.response.set('last-modified', indexHTML.lastModified);
-      return;
+      return undefined;
    }

    await next();

    // check if we are serving an index.html
    if (!(await isIndexHTMLResponse(ctx, cfg.appIndex))) {
-      return;
+      return undefined;
    }

    const lastModified = ctx.response.headers['last-modified'];
@@ -90,7 +97,7 @@ export function createTransformIndexHTMLMiddleware(cfg) {
    const data = indexHTMLData.get(ctx.url);
    if (data && data.lastModified === lastModified) {
      ctx.body = data.indexHTML;
-      return;
+      return undefined;
    }

    // transforms index.html to make the code load correctly with the right polyfills and shims
@@ -99,6 +106,7 @@ export function createTransformIndexHTMLMiddleware(cfg) {
      ctx.url,
      indexHTMLString,
      cfg.compatibilityMode,
+      uaCompat,
    );

    // add new index.html
@@ -115,6 +123,7 @@ export function createTransformIndexHTMLMiddleware(cfg) {
      }
      polyfills.set(`${root}${toBrowserPath(p.path)}`, p.content);
    });
+    return undefined;
  }

  return transformIndexHTMLMiddleware;
--- a/packages/es-dev-server/src/utils/babel-compiler.js
+++ b/packages/es-dev-server/src/utils/babel-compiler.js
@@ -1,93 +0,0 @@
-import { transformAsync } from '@babel/core';
-import deepmerge from 'deepmerge';
-import { findSupportedBrowsers } from '@open-wc/building-utils';
-
-// string length at which babel starts deoptimizing
-const BABEL_DEOPTIMIZED_LENGTH = 500000;
-
-/**
- * @typedef {object} CreateBabelCompilerConfig
- * @property {boolean} readUserBabelConfig
- * @property {boolean} modern
- * @property {object} [customBabelConfig]
- * @property {boolean} legacy
- * @property {boolean} [systemJs]
- */
-
-/** @param {boolean} readUserBabelConfig */
-function createDefaultConfig(readUserBabelConfig) {
-  return {
-    caller: {
-      name: 'es-dev-server',
-      supportsStaticESM: true,
-    },
-    plugins: [
-      require.resolve('@babel/plugin-syntax-dynamic-import'),
-      require.resolve('@babel/plugin-syntax-import-meta'),
-    ],
-    sourceType: 'module',
-    // only read the user's babelrc and config if explicitly enabled
-    babelrc: readUserBabelConfig,
-    configFile: readUserBabelConfig,
-  };
-}
-
-const modernConfig = {
-  presets: [
-    [
-      require.resolve('@babel/preset-env'),
-      {
-        targets: findSupportedBrowsers(),
-        useBuiltIns: false,
-        modules: false,
-      },
-    ],
-  ],
-};
-
-const legacyConfig = {
-  presets: [
-    [
-      require.resolve('@babel/preset-env'),
-      {
-        targets: ['ie 11'],
-        useBuiltIns: false,
-        modules: 'systemjs',
-      },
-    ],
-  ],
-};
-
-/**
- * Creates a babel compiler backed by an in-memory last-read-out cache. Sets up configuration
- * based on a number of presets.
- *
- * @param {CreateBabelCompilerConfig} cfg
- */
-export default function createBabelCompiler(cfg) {
-  // create babel configuration based on a number of presets
-  const babelConfigs = [
-    // custom babel config if it's there
-    createDefaultConfig(cfg.readUserBabelConfig),
-    cfg.modern && modernConfig,
-    cfg.legacy && legacyConfig,
-    cfg.customBabelConfig,
-  ].filter(Boolean);
-
-  const babelConfig = deepmerge.all(babelConfigs);
-
-  /**
-   * @param {string} filename
-   * @param {string} source
-   * @returns {Promise<string>}
-   */
-  function compile(filename, source) {
-    // babel runs out of memory when processing source maps for large files
-    const sourceMaps = source.length > BABEL_DEOPTIMIZED_LENGTH ? false : 'inline';
-    return transformAsync(source, { filename, sourceMaps, ...babelConfig }).then(
-      result => result.code,
-    );
-  }
-
-  return compile;
-}
--- a/packages/es-dev-server/src/utils/babel-transform.js
+++ b/packages/es-dev-server/src/utils/babel-transform.js
@@ -0,0 +1,118 @@
+import { transformAsync } from '@babel/core';
+import deepmerge from 'deepmerge';
+
+// string length at which babel starts deoptimizing
+const BABEL_DEOPTIMIZED_LENGTH = 500000;
+
+/**
+ * @typedef {object} CreateBabelTransformConfig
+ * @property {string | string[]} [browserTarget]
+ * @property {boolean} [polyfillModules]
+ * @property {boolean} [readUserBabelConfig]
+ * @property {object} [customBabelConfig]
+ */
+
+/** @typedef {(filename: string, source: string) => Promise<string>} BabelTransform  */
+
+/**
+ * Creates a babel compiler backed by an in-memory last-read-out cache. Sets up configuration
+ * based on a number of presets.
+ *
+ * @returns {BabelTransform}
+ */
+export function createBabelTransform(babelConfig) {
+  return async function transform(filename, source) {
+    // babel runs out of memory when processing source maps for large files
+    const sourceMaps = source.length > BABEL_DEOPTIMIZED_LENGTH ? false : 'inline';
+
+    const result = await transformAsync(source, { filename, sourceMaps, ...babelConfig });
+    return result.code;
+  };
+}
+
+export const defaultConfig = {
+  caller: {
+    name: 'es-dev-server',
+    supportsStaticESM: true,
+  },
+  /**
+   * Enable syntax plugins for stage 3 features. This does **not** transform them,
+   * it only ensures that babel does not crash when you're using them.
+   */
+  plugins: [
+    require.resolve('@babel/plugin-syntax-import-meta'),
+    require.resolve('@babel/plugin-syntax-class-properties'),
+    require.resolve('@babel/plugin-syntax-nullish-coalescing-operator'),
+    require.resolve('@babel/plugin-syntax-optional-chaining'),
+    require.resolve('@babel/plugin-syntax-numeric-separator'),
+  ],
+  sourceType: 'module',
+};
+
+/**
+ * @param {CreateBabelTransformConfig} cfg
+ * @returns
+ */
+export function createCompatibilityBabelTransform(cfg) {
+  const config = deepmerge(
+    defaultConfig,
+    {
+      presets: [
+        [
+          require.resolve('@babel/preset-env'),
+          {
+            targets: Array.isArray(cfg.browserTarget) ? cfg.browserTarget : [cfg.browserTarget],
+            useBuiltIns: false,
+            shippedProposals: true,
+            modules: false,
+          },
+        ],
+      ],
+      // only read the user's babelrc and config if explicitly enabled
+      babelrc: cfg.readUserBabelConfig,
+      configFile: cfg.readUserBabelConfig,
+    },
+    cfg.customBabelConfig,
+  );
+
+  return createBabelTransform(config);
+}
+
+/** @param {CreateBabelTransformConfig} cfg */
+export function createMinCompatibilityBabelTransform(cfg) {
+  return createCompatibilityBabelTransform({
+    ...cfg,
+    browserTarget: [
+      'last 2 Chrome major versions',
+      'last 2 ChromeAndroid major versions',
+      'last 2 Firefox major versions',
+      'last 2 Edge major versions',
+      'last 2 Safari major versions',
+      'last 2 iOS major versions',
+    ],
+  });
+}
+
+/** @param {CreateBabelTransformConfig} cfg */
+export function createMaxCompatibilityBabelTransform(cfg) {
+  return createCompatibilityBabelTransform({
+    ...cfg,
+    browserTarget: ['defaults', 'ie 10'],
+  });
+}
+
+/**
+ * config for only polyfilling modules, this should be run after the compatibility
+ * config where all js is already compiled to a compatible format. we therefore don't
+ * include any extra plugins or user configuration
+ */
+const polyfillModulesConfig = deepmerge(defaultConfig, {
+  plugins: [
+    require.resolve('@babel/plugin-proposal-dynamic-import'),
+    require.resolve('@babel/plugin-transform-modules-systemjs'),
+  ],
+  babelrc: false,
+  configFile: false,
+});
+
+export const polyfillModulesTransform = createBabelTransform(polyfillModulesConfig);
--- a/packages/es-dev-server/src/utils/caching-compiler.js
+++ b/packages/es-dev-server/src/utils/caching-compiler.js
@@ -1,72 +0,0 @@
-import LRUCache from 'lru-cache';
-
-/**
- * @typedef {object} CacheEntry
- * @property {String} code
- * @property {string} lastModified
- */
-
-/**
- * Creates a compiler backed by an in-memory last-read-out cache.
- *
- * @param {(filePath: string, source: string) => Promise<string>} compile
- */
-export function createCachingCompiler(compile) {
-  /** @type {import('lru-cache')<string, CacheEntry>} */
-  const cache = new LRUCache({
-    length: (n, key) => n.lastModified.length + n.code.length + key.length,
-    max: 52428800,
-  });
-  /** @type {Map<string, Promise<string>>} */
-  const compileTasks = new Map();
-
-  /**
-   * Compiles code and stores the result
-   *
-   * @param {string} filePath the file being compiled
-   * @param {string} sourceCode the origin source code
-   * @param {string} lastModified last time the file was modified on the filesystem, used for caching
-   * @returns {Promise<string>}
-   */
-  async function cachingCompile(filePath, sourceCode, lastModified) {
-    // check for currently running compile tasks to avoid race conditions, for example when
-    // multiple browser instances request the same module
-    const existingCompileTask = compileTasks.get(filePath);
-    if (existingCompileTask) {
-      return existingCompileTask;
-    }
-
-    const compileTask = compile(filePath, sourceCode);
-
-    compileTasks.set(filePath, compileTask);
-
-    try {
-      const compiledCode = await compileTask;
-      // cache result for later
-      cache.set(filePath, { code: compiledCode, lastModified });
-      return compiledCode;
-    } finally {
-      compileTasks.delete(filePath);
-    }
-  }
-
-  /**
-   * Returns cached babel compilation result if we have one for the given file, and if it didn't change
-   * in the meantime.
-   *
-   * @param {string} filePath
-   * @returns {string | undefined}
-   */
-  function getFromCache(filePath, lastModified) {
-    const cacheEntry = cache.get(filePath);
-    if (cacheEntry && cacheEntry.lastModified === lastModified) {
-      return cacheEntry.code;
-    }
-    return undefined;
-  }
-
-  return {
-    compile: cachingCompile,
-    getFromCache,
-  };
-}
--- a/packages/es-dev-server/src/utils/compatibility-transform.js
+++ b/packages/es-dev-server/src/utils/compatibility-transform.js
@@ -0,0 +1,127 @@
+import minimatch from 'minimatch';
+import { DEFAULT_EXTENSIONS } from '@babel/core';
+import {
+  createCompatibilityBabelTransform,
+  createMinCompatibilityBabelTransform,
+  createMaxCompatibilityBabelTransform,
+  polyfillModulesTransform,
+} from './babel-transform.js';
+import { resolveModuleImports } from './resolve-module-imports.js';
+import { compatibilityModes } from '../constants.js';
+
+/** @typedef {import('./babel-transform.js').BabelTransform} BabelTransform */
+
+/**
+ * @typedef {object} CompatibilityTransformConfig
+ * @property {string} rootDir
+ * @property {string[]} moduleDirectories
+ * @property {boolean} readUserBabelConfig
+ * @property {boolean} nodeResolve
+ * @property {string} compatibilityMode
+ * @property {object} [customBabelConfig]
+ * @property {string[]} extraFileExtensions
+ * @property {string[]} babelExclude
+ * @property {boolean} preserveSymlinks
+ */
+
+/**
+ * @typedef {object} FileData
+ * @property {import('./user-agent-compat.js').UserAgentCompat} uaCompat
+ * @property {string} filePath
+ * @property {string} code
+ */
+
+/**
+ * @param {CompatibilityTransformConfig} cfg
+ */
+export function createCompatibilityTransform(cfg) {
+  const fileExtensions = [...DEFAULT_EXTENSIONS, ...cfg.extraFileExtensions];
+  /** @type {Map<string, BabelTransform>} */
+  const babelTransforms = new Map();
+  const minCompatibilityTransform = createMinCompatibilityBabelTransform(cfg);
+  const maxCompatibilityTransform = createMaxCompatibilityBabelTransform(cfg);
+
+  /**
+   * Gets the babel compatibility transform for the given user agent. Caches
+   * babel previously created configs.
+   * @param {FileData} file
+   */
+  function getAutoCompatibilityBabelTranform(file) {
+    const { browserTarget } = file.uaCompat;
+    const cachedTransform = babelTransforms.get(browserTarget);
+    if (cachedTransform) {
+      return cachedTransform;
+    }
+
+    const babelTransform = createCompatibilityBabelTransform({
+      browserTarget,
+      readUserBabelConfig: cfg.readUserBabelConfig,
+      customBabelConfig: cfg.customBabelConfig,
+    });
+    babelTransforms.set(browserTarget, babelTransform);
+    return babelTransform;
+  }
+
+  /**
+   * Gets the compatibility transform function based on the compatibility
+   * mode.
+   * @param {FileData} file
+   */
+  function getCompatibilityBabelTranform(file) {
+    switch (cfg.compatibilityMode) {
+      case compatibilityModes.AUTO:
+        return file.uaCompat.browserTarget
+          ? getAutoCompatibilityBabelTranform(file)
+          : // fall back to max if browser target couldn't be found
+            maxCompatibilityTransform;
+      case compatibilityModes.MIN:
+        return minCompatibilityTransform;
+      case compatibilityModes.MAX:
+        return maxCompatibilityTransform;
+      default:
+        throw new Error(`Unknown compatibility mode: ${cfg.compatibilityMode}`);
+    }
+  }
+  /**
+   * @param {FileData} file
+   */
+  async function compatibilityTransform(file) {
+    let transformedCode = file.code;
+    const isExcluded = cfg.babelExclude.some(pattern => minimatch(file.filePath, pattern));
+    // Modern browsers don't need any transformation, so we avoid parsing with babel for performance.
+    const skipBabelTransform =
+      cfg.compatibilityMode === compatibilityModes.AUTO && file.uaCompat.modern;
+
+    /**
+     * Transform code to a compatible format based on the compatibility setting. We keep ESM syntax
+     * in this step, this will be transformed later if necessary.
+     */
+    if (!isExcluded && !skipBabelTransform) {
+      const compatTransform = getCompatibilityBabelTranform(file);
+      transformedCode = await compatTransform(file.filePath, transformedCode);
+    }
+
+    /**
+     * Resolve module imports. This isn't a babel plugin because if only node-resolve is configured,
+     * we don't need to run babel which makes it a lot faster
+     */
+    if (cfg.nodeResolve) {
+      transformedCode = await resolveModuleImports(cfg.rootDir, file.filePath, transformedCode, {
+        fileExtensions,
+        moduleDirectories: cfg.moduleDirectories,
+        preserveSymlinks: cfg.preserveSymlinks,
+      });
+    }
+
+    /**
+     * If this browser doesn't support es modules, compile it to systemjs using babel.
+     */
+    if (!file.uaCompat.supportsEsm || cfg.compatibilityMode === compatibilityModes.MAX) {
+      transformedCode = await polyfillModulesTransform(file.filePath, transformedCode);
+    }
+
+    return transformedCode;
+  }
+
+  return compatibilityTransform;
+}
--- a/packages/es-dev-server/src/utils/import-maps.js
+++ b/packages/es-dev-server/src/utils/import-maps.js
@@ -1,19 +1,16 @@
-import { compatibilityModes } from '../constants.js';
-
 /**
 * @param {string} indexHTML
 * @param {{ inlineImportMaps: string[], importMapPaths: string[] }} data
- * @param {string} type
 * @returns {string}
 */
-export function addPolyfilledImportMap(indexHTML, data, type) {
+export function addPolyfilledImportMaps(indexHTML, data) {
  let transformedIndexHTML = indexHTML;

  if (data.inlineImportMaps) {
    data.inlineImportMaps.forEach(importMap => {
      transformedIndexHTML = indexHTML.replace(
        '<head>',
-        `<head>\n    <script type="${type}">${importMap}</script>\n`,
+        `<head>\n    <script type="systemjs-importmap">${importMap}</script>\n`,
      );
    });
  }
@@ -22,34 +19,10 @@ export function addPolyfilledImportMap(indexHTML, data, type) {
    data.importMapPaths.forEach(importMapPath => {
      transformedIndexHTML = indexHTML.replace(
        '<head>',
-        `<head>\n    <script type="${type}" src="${importMapPath}"></script>\n`,
+        `<head>\n    <script type="systemjs-importmap" src="${importMapPath}"></script>\n`,
      );
    });
  }

  return transformedIndexHTML;
 }
-
-/**
- * @param {string} baseIndexHTML
- * @param {string} compatibilityMode
- * @param {{ inlineImportMaps: string[], importMapPaths: string[] }} data
- */
-export function addPolyfilledImportMaps(baseIndexHTML, compatibilityMode, data) {
-  let indexHTML = baseIndexHTML;
-
-  // no need to polyfill anything without compatibility mode
-  if (compatibilityMode === compatibilityModes.NONE) {
-    return indexHTML;
-  }
-
-  // add importmap-shim for use with es-module-shims
-  indexHTML = addPolyfilledImportMap(indexHTML, data, 'importmap-shim');
-
-  // if we need to support legacy browsers, also add systemjs-importmap
-  if (compatibilityMode === compatibilityModes.ALL) {
-    indexHTML = addPolyfilledImportMap(indexHTML, data, 'systemjs-importmap');
-  }
-
-  return indexHTML;
-}
--- a/packages/es-dev-server/src/utils/polyfills.js
+++ b/packages/es-dev-server/src/utils/polyfills.js
@@ -1,37 +1,9 @@
-import { compatibilityModes } from '../constants.js';
-
 /** @type {import('@open-wc/building-utils/index-html/create-index-html').PolyfillsConfig} */
-export const esmPolyfills = {
-  esModuleShims: true,
-};
-
-/** @type {import('@open-wc/building-utils/index-html/create-index-html').PolyfillsConfig} */
-export const modernPolyfills = {
-  ...esmPolyfills,
-  webcomponents: true,
-};
-
-/** @type {import('@open-wc/building-utils/index-html/create-index-html').PolyfillsConfig} */
-export const legacyPolyfills = {
-  ...modernPolyfills,
+export const polyfills = {
  coreJs: true,
  regeneratorRuntime: true,
  fetch: true,
  systemJsExtended: true,
+  webcomponents: true,
+  intersectionObserver: true,
 };
-
-/**
- * @param {string} compatibilityMode
- */
-export function getPolyfills(compatibilityMode) {
-  switch (compatibilityMode) {
-    case compatibilityModes.ESM:
-      return esmPolyfills;
-    case compatibilityModes.MODERN:
-      return modernPolyfills;
-    case compatibilityModes.ALL:
-      return legacyPolyfills;
-    default:
-      return {};
-  }
-}
--- a/packages/es-dev-server/src/utils/resolve-module-imports.js
+++ b/packages/es-dev-server/src/utils/resolve-module-imports.js
@@ -2,21 +2,23 @@
 import whatwgUrl from 'whatwg-url';
 import nodeResolve from 'resolve';
 import pathIsInside from 'path-is-inside';
+import deepmerge from 'deepmerge';
 // typescript can't resolve a .cjs file
 // @ts-ignore
 import { parse } from 'es-module-lexer';
 import path from 'path';
 import { toBrowserPath } from './utils.js';
-import createBabelCompiler from './babel-compiler.js';
+import { createBabelTransform, defaultConfig } from './babel-transform.js';

 const CONCAT_NO_PACKAGE_ERROR =
  'Dynamic import with a concatenated string should start with a valid full package name.';

-const babelCompile = createBabelCompiler({
-  readUserBabelConfig: false,
-  modern: false,
-  legacy: false,
-});
+const babelTransform = createBabelTransform(
+  deepmerge(defaultConfig, {
+    babelrc: false,
+    configFile: false,
+  }),
+);

 export class ResolveSyntaxError extends Error {}

@@ -88,7 +90,7 @@ async function resolveConcatenatedImport(sourceFileDir, importPath, config) {

 async function createSyntaxError(sourceFilename, source, originalError) {
  // if es-module-lexer cannot parse the file, use babel to generate a user-friendly error message
-  await babelCompile(sourceFilename, source);
+  await babelTransform(sourceFilename, source);
  // if babel did not have any error, throw a syntax error and log the original error
  console.error(originalError);
  throw new ResolveSyntaxError();
--- a/packages/es-dev-server/src/utils/transform-index-html.js
+++ b/packages/es-dev-server/src/utils/transform-index-html.js
@@ -1,8 +1,7 @@
 import { extractResources, createIndexHTML } from '@open-wc/building-utils/index-html/index.js';
-import { compatibilityModes } from '../constants.js';
-import systemJsLegacyResolveScript from '../browser-scripts/system-js-legacy-resolve.js';
-import { getPolyfills } from './polyfills.js';
+import { polyfills } from './polyfills.js';
 import { addPolyfilledImportMaps } from './import-maps.js';
+import { compatibilityModes, virtualFilePrefix } from '../constants.js';

 /**
 * transforms index.html, extracting any modules and import maps and adds them back
@@ -11,8 +10,13 @@ import { addPolyfilledImportMaps } from './import-maps.js';
 * @param {string} indexUrl
 * @param {string} indexHTMLString
 * @param {string} compatibilityMode
+ * @param {import('./user-agent-compat').UserAgentCompat} uaCompat
 */
-export function getTransformedIndexHTML(indexUrl, indexHTMLString, compatibilityMode) {
+export function getTransformedIndexHTML(indexUrl, indexHTMLString, compatibilityMode, uaCompat) {
+  const polyfillModules =
+    (compatibilityMode === compatibilityModes.AUTO && !uaCompat.supportsEsm) ||
+    compatibilityMode === compatibilityModes.MAX;
+
  // extract input files from index.html
  const resources = extractResources(indexHTMLString, { removeImportMaps: false });
  /** @type {Map<string, string>} */
@@ -24,7 +28,9 @@ export function getTransformedIndexHTML(indexUrl, indexHTMLString, compatibility

  const files = [
    ...resources.jsModules,
-    ...[...inlineModules.keys()].map(e => `${e}?source=${encodeURIComponent(indexUrl)}`),
+    ...[...inlineModules.keys()].map(
+      e => `${virtualFilePrefix}${e}?source=${encodeURIComponent(indexUrl)}`,
+    ),
  ];

  if (files.length === 0) {
@@ -38,27 +44,24 @@ export function getTransformedIndexHTML(indexUrl, indexHTMLString, compatibility
  // create a new index.html with injected polyfills and loader script
  const createResult = createIndexHTML(resources.indexHTML, {
    entries: {
-      type: 'module',
+      type: polyfillModules ? 'system' : 'module',
      files,
    },
-    legacyEntries:
-      compatibilityMode !== compatibilityModes.ALL
-        ? undefined
-        : {
-            type: 'system',
-            files,
-          },
-    polyfills: getPolyfills(compatibilityMode),
+    polyfills,
    minify: false,
    preload: false,
  });

  let { indexHTML } = createResult;
-  indexHTML = addPolyfilledImportMaps(indexHTML, compatibilityMode, resources);
-
-  // inject systemjs resolver which appends a query param to trigger es5 compilation
-  if (compatibilityMode === compatibilityModes.ALL) {
-    indexHTML = indexHTML.replace('</body>', `${systemJsLegacyResolveScript}</body>`);
+  if (polyfillModules) {
+    indexHTML = addPolyfilledImportMaps(indexHTML, resources);
+  } else {
+    // this is needed because @open-wc/building-utils uses importShim to import the main app
+    // but we don't use modules on browsers without dynamic imports, so we can just alias it
+    indexHTML = indexHTML.replace(
+      '<script>',
+      '<script>window.importShim = s => import(s);</script><script>',
+    );
  }

  return {
--- a/packages/es-dev-server/src/utils/user-agent-compat.js
+++ b/packages/es-dev-server/src/utils/user-agent-compat.js
@@ -0,0 +1,157 @@
+/* eslint-disable no-console */
+import { resolveUserAgent, matchesUA } from 'browserslist-useragent';
+import * as browserslist from 'browserslist';
+import * as caniuse from 'caniuse-api';
+
+/**
+ * @typedef {object} UserAgentCompat
+ * @property {string} browserTarget the browser name and version, usable for targeted compilation
+ * @property {boolean} modern whether this is a modern browser: the latest 2 of the major browsers
+ * @property {boolean} supportsEsm whether this browsers supports es modules
+ */
+
+/**
+ * We compile to es modules when the browser supports module scripts, dynamic imports
+ * and import.meta.url. Unfortunately, caniuse doesn't report import.meta.url. Chrome 63
+ * is the only browser which suppors dynamic imports but not import.meta.url.
+ */
+const moduleFeatures = ['es6-module', 'es6-module-dynamic-import'];
+
+// Cache resolved user agents because we're going to request them a lot
+/** @type {Map<string, UserAgentCompat>} */
+const cache = new Map();
+
+// Some browsers are resolved to a name unknown to browserslist
+const browserAliases = {
+  'UC Browser': 'UCAndroid',
+};
+
+/**
+ * The user agent parser does not always return a valid version for samsung,
+ * so we need to normalize it.
+ */
+function normalizeSamsungVersion(browser, version) {
+  try {
+    browserslist(`${browser} ${version}`);
+    // browserslist didn't throw, return the valid version
+    return version;
+  } catch (error) {
+    // we gave an invalid version to browserslist, so we try to
+    // find the nearest matching major version for samsung browser
+    const validVersions = [
+      ...Object.keys(browserslist.versionAliases.samsung),
+      ...browserslist.data.samsung.versions,
+    ];
+
+    return validVersions.find(validVersion => validVersion[0] === version[0]);
+  }
+}
+
+/**
+ * The user agent parser returns patch versions, which browserslist doesn't
+ * know about. Mostly the major version is sufficient, except for safari.
+ * @param {*} resolvedUA
+ */
+function getBrowserVersion(resolvedUA) {
+  const version = resolvedUA.version.split('.');
+  switch (resolvedUA.family) {
+    case 'Safari':
+    case 'iOS':
+      return `${version[0]}.${version[1]}`;
+    case 'Samsung':
+      return normalizeSamsungVersion(resolvedUA.family, version);
+    default:
+      return version[0];
+  }
+}
+
+function getBrowserName(browserName) {
+  return browserAliases[browserName] || browserName;
+}
+
+/**
+ * Returns whether this browser supports es modules. We count this when the browser
+ * supports module syntax, scripts, dynamic imports. We can't feature detect
+ * import.meta.url but any browsers which supports dynamic import supports import.meta.url,
+ * except for chrome 63.
+ * @param {string} browserTarget
+ */
+function getSupportsEsm(browserTarget) {
+  if (browserTarget.toLowerCase() === 'chrome 63') {
+    return false;
+  }
+  return moduleFeatures.every(ft => caniuse.isSupported(ft, browserTarget));
+}
+
+/**
+ * Calculates the user agent's compatibility.
+ * @param {string} userAgent
+ */
+function calcUserAgentCompat(userAgent) {
+  let resolvedUA;
+  try {
+    resolvedUA = resolveUserAgent(userAgent);
+    const browserTarget = `${getBrowserName(resolvedUA.family)} ${getBrowserVersion(resolvedUA)}`;
+    const supportsEsm = getSupportsEsm(browserTarget);
+
+    const modern = matchesUA(userAgent, {
+      browsers: [
+        'last 2 Chrome major versions',
+        'unreleased Chrome versions',
+        'last 2 ChromeAndroid major versions',
+        'unreleased ChromeAndroid versions',
+        'last 2 Opera major versions',
+        'unreleased Opera versions',
+        'last 2 Firefox major versions',
+        'unreleased Firefox versions',
+        'last 2 FirefoxAndroid major versions',
+        'unreleased FirefoxAndroid versions',
+        // // safari versions progress more slowly
+        'last 1 Safari versions',
+        'last 1 iOS versions',
+        // unreleased safari throws an error?
+        // 'unreleased Safari versions',
+      ],
+      allowHigherVersions: true,
+    });
+
+    return {
+      browserTarget,
+      modern,
+      supportsEsm,
+    };
+  } catch (error) {
+    console.error(error);
+    let message = '\n';
+    if (!resolvedUA) {
+      message = `Unable to resolve user agent: ${userAgent}.`;
+    } else {
+      message = `Resolved to invalid user agent: ${JSON.stringify(resolvedUA)}.`;
+    }
+    console.warn(
+      `${message} Using max compatibility mode. Try updating your dependencies, ` +
+        'or file an issue with a reproduction.\n',
+    );
+    return {
+      browserTarget: null,
+      modern: false,
+      supportsEsm: false,
+    };
+  }
+}
+
+/**
+ * @param {import('koa').Context} ctx
+ * @returns {UserAgentCompat}
+ */
+export function getUserAgentCompat(ctx) {
+  const userAgent = ctx.get('user-agent');
+  let compat = cache.get(userAgent);
+
+  if (!compat) {
+    compat = calcUserAgentCompat(userAgent);
+    cache.set(userAgent, compat);
+  }
+
+  return compat;
+}
--- a/packages/es-dev-server/src/utils/utils.js
+++ b/packages/es-dev-server/src/utils/utils.js
@@ -2,6 +2,7 @@ import isStream from 'is-stream';
 import getStream from 'get-stream';
 import Stream from 'stream';
 import path from 'path';
+import { virtualFilePrefix } from '../constants.js';

 /**
 * koa-static stores the original served file path on ctx.body.path,
@@ -117,7 +118,7 @@ export function isPolyfill(url) {
 * @param {string} url
 */
 export function isInlineModule(url) {
-  return url.includes('/inline-module-') && url.includes('?source=');
+  return url.includes(`${virtualFilePrefix}inline-module-`) && url.includes('?source=');
 }

 /**
@@ -125,7 +126,7 @@ export function isInlineModule(url) {
 * @param {string} url
 */
 export function isGeneratedFile(url) {
-  return isPolyfill(url) || isInlineModule(url);
+  return url.startsWith(virtualFilePrefix) || isPolyfill(url) || isInlineModule(url);
 }

 /**
--- a/packages/es-dev-server/test/snapshots/resolve-module-imports/query-params-and-hashes.js
+++ b/packages/es-dev-server/test/snapshots/resolve-module-imports/query-params-and-hashes.js
@@ -0,0 +1,15 @@
+
+      import '../node_modules/my-module/index.js?foo=bar';
+      import '../node_modules/my-module/index.js#foo';
+      import '../node_modules/my-module/index.js?foo=bar#bar';
+      import './local-module.js?foo=bar';
+      import './local-module.js#foo';
+      import './local-module.js?foo=bar#bar';
+
+      import('../node_modules/my-module/index.js?foo=bar');
+      import('../node_modules/my-module/index.js#foo');
+      import('../node_modules/my-module/index.js?foo=bar#bar');
+      import('./local-module.js?foo=bar');
+      import('./local-module.js#foo');
+      import('./local-module.js?foo=bar#bar');
+    
--- a/packages/es-dev-server/test/snapshots/transform-index-html/import-map-all.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/import-map-all.html
@@ -1,107 +0,0 @@
-<html><head>
-    <script type="systemjs-importmap">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-
-    <script type="importmap-shim">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-
-  <title>My app</title>
-
-  <script type="importmap">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-</head>
-
-<body>
-
-  
-
-
-
-<script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script src="polyfills/systemjs.dd4729ef25f652d7d05aed80a2ea00e7.js" nomodule=""></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
-  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js', false)) }
-  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.01496319407efe7ef743b10afbb93714.js', false)) }
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    'noModule' in HTMLScriptElement.prototype ? window.importShim('./app.js') : System.import('./app.js');
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script>
-<script nomodule>
-  // appends a query param to each systemjs request to trigger es5 compilation
-  var originalResolve = System.constructor.prototype.resolve;
-  System.constructor.prototype.resolve = function () {
-    return Promise.resolve(originalResolve.apply(this, arguments))
-      .then(function (url) {
-        return url + '?legacy=true';
-      });
-  };
-</script>
-
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/import-map-auto.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/import-map-auto.html
@@ -0,0 +1,22 @@
+<html>
+
+<head>
+  <title>My app</title>
+
+  <script type="importmap">
+    {
+      "imports": {
+        "foo": "/node_modules/foo/foo.js",
+        "bar": "/node_modules/bar/bar.js"
+      }
+    }
+  </script>
+</head>
+
+<body>
+
+  <script type="module" src="./app.js"></script>
+
+</body>
+
+</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/import-map-esm.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/import-map-esm.html
@@ -1,48 +0,0 @@
-<html><head>
-    <script type="importmap-shim">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-
-  <title>My app</title>
-
-  <script type="importmap">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-</head>
-
-<body>
-
-  
-
-
-
-<script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    window.importShim('./app.js');
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/import-map-max.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/import-map-max.html
@@ -0,0 +1,50 @@
+<html><head>
+    <script type="systemjs-importmap">
+    {
+      "imports": {
+        "foo": "/node_modules/foo/foo.js",
+        "bar": "/node_modules/bar/bar.js"
+      }
+    }
+  </script>
+
+  <title>My app</title>
+
+  <script type="importmap">
+    {
+      "imports": {
+        "foo": "/node_modules/foo/foo.js",
+        "bar": "/node_modules/bar/bar.js"
+      }
+    }
+  </script>
+</head>
+
+<body>
+
+  
+
+
+
+<script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/systemjs.dd4729ef25f652d7d05aed80a2ea00e7.js"></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
+  function loadScript(src, module) {
+    return new Promise(function (resolve, reject) {
+      document.head.appendChild(Object.assign(
+        document.createElement('script'),
+        { src: src, onload: resolve, onerror: reject },
+        module ? { type: 'module' } : undefined
+      ));
+    });
+  }
+
+  var polyfills = [];
+  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
+  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js', false)) }
+  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.0ec040d16c6fd1b9220084b0b925cbe0.js', false)) }
+
+  function loadEntries() {
+    System.import('./app.js');
+  }
+
+  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
+})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/import-map-min.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/import-map-min.html
@@ -0,0 +1,41 @@
+<html><head>
+  <title>My app</title>
+
+  <script type="importmap">
+    {
+      "imports": {
+        "foo": "/node_modules/foo/foo.js",
+        "bar": "/node_modules/bar/bar.js"
+      }
+    }
+  </script>
+</head>
+
+<body>
+
+  
+
+
+
+<script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
+  function loadScript(src, module) {
+    return new Promise(function (resolve, reject) {
+      document.head.appendChild(Object.assign(
+        document.createElement('script'),
+        { src: src, onload: resolve, onerror: reject },
+        module ? { type: 'module' } : undefined
+      ));
+    });
+  }
+
+  var polyfills = [];
+  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
+  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js', false)) }
+  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.0ec040d16c6fd1b9220084b0b925cbe0.js', false)) }
+
+  function loadEntries() {
+    import('./app.js');
+  }
+
+  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
+})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/import-map-modern.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/import-map-modern.html
@@ -1,86 +0,0 @@
-<html><head>
-    <script type="importmap-shim">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-
-  <title>My app</title>
-
-  <script type="importmap">
-    {
-      "imports": {
-        "foo": "/node_modules/foo/foo.js",
-        "bar": "/node_modules/bar/bar.js"
-      }
-    }
-  </script>
-</head>
-
-<body>
-
-  
-
-
-
-<script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js', false)) }
-  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.01496319407efe7ef743b10afbb93714.js', false)) }
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    window.importShim('./app.js');
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script>
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-all.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-all.html
@@ -1,84 +0,0 @@
-<html><head>
-  <title>My app</title>
-</head>
-
-<body>
-
-  
-
-  
-
-  
-
-
-
-<script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script src="polyfills/systemjs.dd4729ef25f652d7d05aed80a2ea00e7.js" nomodule=""></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
-  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js', false)) }
-  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.01496319407efe7ef743b10afbb93714.js', false)) }
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    'noModule' in HTMLScriptElement.prototype ? ['./app.js','./inline-module-0.js?source=%2Findex.html','./inline-module-1.js?source=%2Findex.html'].forEach(function (entry) { window.importShim(entry); }) : ['./app.js','./inline-module-0.js?source=%2Findex.html','./inline-module-1.js?source=%2Findex.html'].forEach(function (entry) { System.import(entry); });
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script>
-<script nomodule>
-  // appends a query param to each systemjs request to trigger es5 compilation
-  var originalResolve = System.constructor.prototype.resolve;
-  System.constructor.prototype.resolve = function () {
-    return Promise.resolve(originalResolve.apply(this, arguments))
-      .then(function (url) {
-        return url + '?legacy=true';
-      });
-  };
-</script>
-
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-auto.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-auto.html
@@ -0,0 +1,39 @@
+<html>
+
+<head>
+  <title>My app</title>
+</head>
+
+<body>
+
+  <script type="module">
+    import { message } from 'my-module';
+    import './src/local-module.js';
+
+    console.log(`The message is: ${message}`);
+
+    // class is compiled by legacy build
+    class Foo {
+
+    }
+
+    // class is compiled by legacy build
+    const bar = 'buz';
+
+    async function* asyncGenerator() {
+      await Promise.resolve();
+      yield 0;
+      await Promise.resolve();
+      yield 1;
+    }
+  </script>
+
+  <script type="module">
+    console.log('hello world');
+  </script>
+
+  <script type="module" src="./app.js"></script>
+
+</body>
+
+</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-esm.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-esm.html
@@ -1,34 +0,0 @@
-<html><head>
-  <title>My app</title>
-</head>
-
-<body>
-
-  
-
-  
-
-  
-
-
-
-<script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    ['./app.js','./inline-module-0.js?source=%2Findex.html','./inline-module-1.js?source=%2Findex.html'].forEach(function (entry) { window.importShim(entry); });
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-max.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-max.html
@@ -0,0 +1,36 @@
+<html><head>
+  <title>My app</title>
+</head>
+
+<body>
+
+  
+
+  
+
+  
+
+
+
+<script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/systemjs.dd4729ef25f652d7d05aed80a2ea00e7.js"></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
+  function loadScript(src, module) {
+    return new Promise(function (resolve, reject) {
+      document.head.appendChild(Object.assign(
+        document.createElement('script'),
+        { src: src, onload: resolve, onerror: reject },
+        module ? { type: 'module' } : undefined
+      ));
+    });
+  }
+
+  var polyfills = [];
+  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
+  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js', false)) }
+  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.0ec040d16c6fd1b9220084b0b925cbe0.js', false)) }
+
+  function loadEntries() {
+    ['./app.js','/__es-dev-server__/inline-module-0.js?source=%2Findex.html','/__es-dev-server__/inline-module-1.js?source=%2Findex.html'].forEach(function (entry) { System.import(entry); });
+  }
+
+  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
+})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-min.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-min.html
@@ -0,0 +1,36 @@
+<html><head>
+  <title>My app</title>
+</head>
+
+<body>
+
+  
+
+  
+
+  
+
+
+
+<script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
+  function loadScript(src, module) {
+    return new Promise(function (resolve, reject) {
+      document.head.appendChild(Object.assign(
+        document.createElement('script'),
+        { src: src, onload: resolve, onerror: reject },
+        module ? { type: 'module' } : undefined
+      ));
+    });
+  }
+
+  var polyfills = [];
+  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
+  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js', false)) }
+  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.0ec040d16c6fd1b9220084b0b925cbe0.js', false)) }
+
+  function loadEntries() {
+    ['./app.js','/__es-dev-server__/inline-module-0.js?source=%2Findex.html','/__es-dev-server__/inline-module-1.js?source=%2Findex.html'].forEach(function (entry) { import(entry); });
+  }
+
+  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
+})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-modern.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-modern.html
@@ -1,72 +0,0 @@
-<html><head>
-  <title>My app</title>
-</head>
-
-<body>
-
-  
-
-  
-
-  
-
-
-
-<script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js', false)) }
-  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.01496319407efe7ef743b10afbb93714.js', false)) }
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    ['./app.js','./inline-module-0.js?source=%2Findex.html','./inline-module-1.js?source=%2Findex.html'].forEach(function (entry) { window.importShim(entry); });
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script>
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-none-babel.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/inline-module-none-babel.html
@@ -12,40 +12,4 @@



-<script src="./app.js" type="module"></script><script src="./inline-module-0.js?source=%2Findex.html" type="module"></script><script src="./inline-module-1.js?source=%2Findex.html" type="module"></script>
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
+<script src="./app.js" type="module"></script><script src="/__es-dev-server__/inline-module-0.js?source=%2Findex.html" type="module"></script><script src="/__es-dev-server__/inline-module-1.js?source=%2Findex.html" type="module"></script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/simple-all.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/simple-all.html
@@ -1,87 +0,0 @@
-<html><head>
-  <title>My app</title>
-</head>
-
-<body>
-
-  <!-- relative path -->
-  
-
-  <!-- upwards path -->
-  
-
-  <!-- absolute path -->
-  
-
-
-
-<script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script src="polyfills/systemjs.dd4729ef25f652d7d05aed80a2ea00e7.js" nomodule=""></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
-  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js', false)) }
-  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.01496319407efe7ef743b10afbb93714.js', false)) }
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    'noModule' in HTMLScriptElement.prototype ? ['./app.js','../src/app.js','/src/app.js'].forEach(function (entry) { window.importShim(entry); }) : ['./app.js','../src/app.js','/src/app.js'].forEach(function (entry) { System.import(entry); });
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script>
-<script nomodule>
-  // appends a query param to each systemjs request to trigger es5 compilation
-  var originalResolve = System.constructor.prototype.resolve;
-  System.constructor.prototype.resolve = function () {
-    return Promise.resolve(originalResolve.apply(this, arguments))
-      .then(function (url) {
-        return url + '?legacy=true';
-      });
-  };
-</script>
-
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/simple-auto.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/simple-auto.html
@@ -0,0 +1,20 @@
+<html>
+
+<head>
+  <title>My app</title>
+</head>
+
+<body>
+
+  <!-- relative path -->
+  <script type="module" src="./app.js"></script>
+
+  <!-- upwards path -->
+  <script type="module" src="../src/app.js"></script>
+
+  <!-- absolute path -->
+  <script type="module" src="/src/app.js"></script>
+
+</body>
+
+</html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/simple-esm.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/simple-esm.html
@@ -1,37 +0,0 @@
-<html><head>
-  <title>My app</title>
-</head>
-
-<body>
-
-  <!-- relative path -->
-  
-
-  <!-- upwards path -->
-  
-
-  <!-- absolute path -->
-  
-
-
-
-<script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    ['./app.js','../src/app.js','/src/app.js'].forEach(function (entry) { window.importShim(entry); });
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/simple-max.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/simple-max.html
@@ -0,0 +1,39 @@
+<html><head>
+  <title>My app</title>
+</head>
+
+<body>
+
+  <!-- relative path -->
+  
+
+  <!-- upwards path -->
+  
+
+  <!-- absolute path -->
+  
+
+
+
+<script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/systemjs.dd4729ef25f652d7d05aed80a2ea00e7.js"></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
+  function loadScript(src, module) {
+    return new Promise(function (resolve, reject) {
+      document.head.appendChild(Object.assign(
+        document.createElement('script'),
+        { src: src, onload: resolve, onerror: reject },
+        module ? { type: 'module' } : undefined
+      ));
+    });
+  }
+
+  var polyfills = [];
+  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
+  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js', false)) }
+  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.0ec040d16c6fd1b9220084b0b925cbe0.js', false)) }
+
+  function loadEntries() {
+    ['./app.js','../src/app.js','/src/app.js'].forEach(function (entry) { System.import(entry); });
+  }
+
+  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
+})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/simple-min.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/simple-min.html
@@ -0,0 +1,39 @@
+<html><head>
+  <title>My app</title>
+</head>
+
+<body>
+
+  <!-- relative path -->
+  
+
+  <!-- upwards path -->
+  
+
+  <!-- absolute path -->
+  
+
+
+
+<script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/regenerator-runtime.45f8b90cc0fac37d446d8da4b68e27f5.js" nomodule=""></script><script>(function() {
+  function loadScript(src, module) {
+    return new Promise(function (resolve, reject) {
+      document.head.appendChild(Object.assign(
+        document.createElement('script'),
+        { src: src, onload: resolve, onerror: reject },
+        module ? { type: 'module' } : undefined
+      ));
+    });
+  }
+
+  var polyfills = [];
+  if (!('fetch' in window)) { polyfills.push(loadScript('polyfills/fetch.8c78815e37189a88a5ccc668ab31698f.js', false)) }
+  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js', false)) }
+  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.0ec040d16c6fd1b9220084b0b925cbe0.js', false)) }
+
+  function loadEntries() {
+    ['./app.js','../src/app.js','/src/app.js'].forEach(function (entry) { import(entry); });
+  }
+
+  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
+})();</script></body></html>
--- a/packages/es-dev-server/test/snapshots/transform-index-html/simple-modern.html
+++ b/packages/es-dev-server/test/snapshots/transform-index-html/simple-modern.html
@@ -1,75 +0,0 @@
-<html><head>
-  <title>My app</title>
-</head>
-
-<body>
-
-  <!-- relative path -->
-  
-
-  <!-- upwards path -->
-  
-
-  <!-- absolute path -->
-  
-
-
-
-<script>(function() {
-  function loadScript(src, module) {
-    return new Promise(function (resolve, reject) {
-      document.head.appendChild(Object.assign(
-        document.createElement('script'),
-        { src: src, onload: resolve, onerror: reject },
-        module ? { type: 'module' } : undefined
-      ));
-    });
-  }
-
-  var polyfills = [];
-  if (!('attachShadow' in Element.prototype) || !('getRootNode' in Element.prototype)) { polyfills.push(loadScript('polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js', false)) }
-  if (!('noModule' in HTMLScriptElement.prototype) && 'getRootNode' in Element.prototype) { polyfills.push(loadScript('polyfills/custom-elements-es5-adapter.01496319407efe7ef743b10afbb93714.js', false)) }
-  if ('noModule' in HTMLScriptElement.prototype) { polyfills.push(loadScript('polyfills/es-module-shims.eb2529466e6458528ad13c7d46e47a52.js', true)) }
-
-  function loadEntries() {
-    ['./app.js','../src/app.js','/src/app.js'].forEach(function (entry) { window.importShim(entry); });
-  }
-
-  polyfills.length ? Promise.all(polyfills).then(loadEntries) : loadEntries();
-})();</script>
-  <script>
-    // sets up a message channel with es-dev-server to receive events
-    // for reloading the browser on file change or logging errors
-    (function () {
-      if (!('EventSource' in window)) {
-        return;
-      }
-
-      var eventSource = new EventSource('/__es-dev-server-message-channel__');
-      var reloading = false;
-
-      eventSource.addEventListener('file-changed', function (e) {
-        reloading = true;
-        location.reload();
-      });
-
-      eventSource.addEventListener('error-message', function (e) {
-        if (reloading) {
-          return;
-        }
-        
-        console.error(JSON.parse(e.data));
-      });
-
-      eventSource.addEventListener('error', function () {
-        if (reloading) {
-          return;
-        }
-
-        console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
-        eventSource.close();
-      });
-    }());
-  </script>
-</body>
-</html>
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/app.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/app.js
@@ -1,4 +1,4 @@
 // @ts-nocheck
 /* eslint-disable */
 console.log('my app');
-import('./lazy-99ef5fe0.js');
+import('./lazy-ad0cfec5.js');
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/index.html
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/index.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>console.log("hello inline script");</script><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script src="polyfills/regenerator-runtime.61c01f337f4241bb46c77e10a7e01300.js" nomodule=""></script><script src="loader.083a8d99c4d8ba29572ed88d5a2098f8.js"></script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/regenerator-runtime.323cb013cc2a9c88ff67ee256cbf5942.js" nomodule=""></script><script>console.log("hello inline script");</script><script src="loader.79d1fccb92ddcc0708196704356f530d.js"></script></body></html>
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/lazy-ad0cfec5.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/lazy-ad0cfec5.js
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/loader.083a8d99c4d8ba29572ed88d5a2098f8.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/loader.083a8d99c4d8ba29572ed88d5a2098f8.js
@@ -1 +0,0 @@
-!function(){function e(e,o){return new Promise(function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))})}var o=[];function t(){window.importShim("./app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js",!1)),o.length?Promise.all(o).then(t):t()}();
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/loader.79d1fccb92ddcc0708196704356f530d.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/loader.79d1fccb92ddcc0708196704356f530d.js
@@ -0,0 +1 @@
+!function(){function e(e,o){return new Promise((function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))}))}var o=[];function t(){window.importShim("./app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js",!1)),o.length?Promise.all(o).then(t):t()}();
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.77da473353460b142f5e09e540324336.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.77da473353460b142f5e09e540324336.js
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.77da473353460b142f5e09e540324336.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.77da473353460b142f5e09e540324336.js.map
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js.map
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js
@@ -1 +0,0 @@
-!function(){"use strict";!function(){if(void 0===window.Reflect||void 0===window.customElements||window.customElements.polyfillWrapFlushCallback)return;const t=HTMLElement;window.HTMLElement=function(){return Reflect.construct(t,[],this.constructor)},HTMLElement.prototype=t.prototype,HTMLElement.prototype.constructor=HTMLElement,Object.setPrototypeOf(HTMLElement,t)}()}();
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js.map
@@ -1 +0,0 @@
-{"version":3,"sources":["0"],"names":["window","Reflect","customElements","polyfillWrapFlushCallback","a","HTMLElement","construct","this","constructor","prototype","Object","setPrototypeOf"],"mappings":"CASC,WACC,cAEA,WAAY,QAAG,IAASA,OAAOC,cAAS,IAASD,OAAOE,gBAAgBF,OAAOE,eAAeC,0BAA0B,OAAO,MAAMC,EAAEC,YAAYL,OAAOK,YAAY,WAAuB,OAAOJ,QAAQK,UAAUF,EAAE,GAAGG,KAAKC,cAAcH,YAAYI,UAAUL,EAAEK,UAAUJ,YAAYI,UAAUD,YAAYH,YAAYK,OAAOC,eAAeN,YAAYD,GAAhW,GAHF"}
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js
@@ -0,0 +1,10 @@
+/**
+@license @nocompile
+Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+*/
+!function(){"use strict";!function(){if(void 0===window.Reflect||void 0===window.customElements||window.customElements.polyfillWrapFlushCallback)return;const t=HTMLElement;window.HTMLElement={HTMLElement:function(){return Reflect.construct(t,[],this.constructor)}}.HTMLElement,HTMLElement.prototype=t.prototype,HTMLElement.prototype.constructor=HTMLElement,Object.setPrototypeOf(HTMLElement,t)}()}();
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["0"],"names":["window","Reflect","customElements","polyfillWrapFlushCallback","a","HTMLElement","construct","this","constructor","prototype","Object","setPrototypeOf"],"mappings":";;;;;;;;;CASC,WACC,cAEA,WAAY,QAAG,IAASA,OAAOC,cAAS,IAASD,OAAOE,gBAAgBF,OAAOE,eAAeC,0BAA0B,OAAO,MAAMC,EAAEC,YAAYL,OAAOK,YAAY,CAACA,YAAY,WAAuB,OAAOJ,QAAQK,UAAUF,EAAE,GAAGG,KAAKC,eAAeH,YAAYA,YAAYI,UAAUL,EAAEK,UAAUJ,YAAYI,UAAUD,YAAYH,YAAYK,OAAOC,eAAeN,YAAYD,GAA1X,GAHF"}
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js.map
@@ -1 +1 @@
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+{"version":3,"sources":["0"],"names":["window","importShim","url","Promise","resolve","reject","vector","Math","random","toString","slice","script","document","createElement","destructor","onerror","onload","remove","URL","revokeObjectURL","src","defer","type","Error","absURL","a","setAttribute","cloneNode","href","toAbsoluteURL","blob","Blob","createObjectURL","head","appendChild"],"mappings":"AAqDEA,OAAOC,WAnCP,SAAoBC,GAClB,OAAO,IAAIC,QAAQ,CAACC,EAASC,KAC3B,MAAMC,EACJ,iBACAC,KAAKC,SACFC,SAAS,IACTC,MAAM,GACLC,EAASC,SAASC,cAAc,UAChCC,EAAa,YACVd,OAAOM,GACdK,EAAOI,QAAU,KACjBJ,EAAOK,OAAS,KAChBL,EAAOM,SACPC,IAAIC,gBAAgBR,EAAOS,KAC3BT,EAAOS,IAAM,IAEfT,EAAOU,MAAQ,QACfV,EAAOW,KAAO,SACdX,EAAOI,QAAU,KACfV,EAAO,IAAIkB,MAAM,qBAAqBrB,MACtCY,KAEFH,EAAOK,OAAS,KACdZ,EAAQJ,OAAOM,IACfQ,KAEF,MAAMU,EAhCV,SAAuBtB,GACrB,MAAMuB,EAAIb,SAASC,cAAc,KAEjC,OADAY,EAAEC,aAAa,OAAQxB,GAChBuB,EAAEE,WAAU,GAAOC,KA6BTC,CAAc3B,GAEvB4B,EAAO,IAAIC,KAAK,CADP,uBAAuBP,cAAmBlB,UACzB,CAAEgB,KAAM,oBACxCX,EAAOS,IAAMF,IAAIc,gBAAgBF,GAEjClB,SAASqB,KAAKC,YAAYvB"}
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/regenerator-runtime.323cb013cc2a9c88ff67ee256cbf5942.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/regenerator-runtime.323cb013cc2a9c88ff67ee256cbf5942.js
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/regenerator-runtime.323cb013cc2a9c88ff67ee256cbf5942.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/regenerator-runtime.323cb013cc2a9c88ff67ee256cbf5942.js.map
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/regenerator-runtime.61c01f337f4241bb46c77e10a7e01300.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/regenerator-runtime.61c01f337f4241bb46c77e10a7e01300.js
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js
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-/**
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-Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
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-*/
-(function(){/*
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- Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
- This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
- The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
- The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
- Code distributed by Google as part of the polymer project is also
- subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-*/
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+/**
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+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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+ The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+ The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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+l.ftp=21;l.file=0;l.gopher=70;l.http=80;l.https=443;l.ws=80;l.wss=443;var m=Object.create(null);m["%2e"]=".";m[".%2e"]="..";m["%2e."]="..";m["%2e%2e"]="..";var q=/[a-zA-Z]/,H=/[a-zA-Z0-9\+\-\.]/;g.prototype={toString:function(){return this.href},get href(){if(this.i)return this.a;var r="";if(""!=this.s||null!=this.g)r=this.s+(null!=this.g?":"+this.g:"")+"@";return this.protocol+(this.C?"//"+r+this.host:"")+this.pathname+this.o+this.v},set href(r){f.call(this);e.call(this,r)},get protocol(){return this.h+
+":"},set protocol(r){this.i||e.call(this,r+":","scheme start")},get host(){return this.i?"":this.m?this.j+":"+this.m:this.j},set host(r){!this.i&&this.C&&e.call(this,r,"host")},get hostname(){return this.j},set hostname(r){!this.i&&this.C&&e.call(this,r,"hostname")},get port(){return this.m},set port(r){!this.i&&this.C&&e.call(this,r,"port")},get pathname(){return this.i?"":this.C?"/"+this.l.join("/"):this.ha},set pathname(r){!this.i&&this.C&&(this.l=[],e.call(this,r,"relative path start"))},get search(){return this.i||
+!this.o||"?"==this.o?"":this.o},set search(r){!this.i&&this.C&&(this.o="?","?"==r[0]&&(r=r.slice(1)),e.call(this,r,"query"))},get hash(){return this.i||!this.v||"#"==this.v?"":this.v},set hash(r){this.i||(r?(this.v="#","#"==r[0]&&(r=r.slice(1)),e.call(this,r,"fragment")):this.v="")},get origin(){var r;if(this.i||!this.h)return"";switch(this.h){case "data":case "file":case "javascript":case "mailto":return"null"}return(r=this.host)?this.h+"://"+r:""}};var E=a.URL;E&&(g.createObjectURL=function(r){return E.createObjectURL.apply(E,
+arguments)},g.revokeObjectURL=function(r){E.revokeObjectURL(r)});a.URL=g}})(window);Object.getOwnPropertyDescriptor(Node.prototype,"baseURI")||Object.defineProperty(Node.prototype,"baseURI",{get:function(){var a=(this.ownerDocument||this).querySelector("base[href]");return a&&a.href||window.location.href},configurable:!0,enumerable:!0});var Kh=document.createElement("style");Kh.textContent="body {transition: opacity ease-in 0.2s; } \nbody[unresolved] {opacity: 0; display: block; overflow: hidden; position: relative; } \n";var Lh=document.querySelector("head");Lh.insertBefore(Kh,Lh.firstChild);var Mh=window.customElements,Nh=!1,Oh=null;Mh.polyfillWrapFlushCallback&&Mh.polyfillWrapFlushCallback(function(a){Oh=a;Nh&&a()});function Ph(){window.HTMLTemplateElement.bootstrap&&window.HTMLTemplateElement.bootstrap(window.document);Oh&&Oh();Nh=!0;window.WebComponents.ready=!0;document.dispatchEvent(new CustomEvent("WebComponentsReady",{bubbles:!0}))}
+"complete"!==document.readyState?(window.addEventListener("load",Ph),window.addEventListener("DOMContentLoaded",function(){window.removeEventListener("load",Ph);Ph()})):Ph();}).call(this);
+
+//# sourceMappingURL=webcomponents-bundle.js.map
--- a/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js.map
+++ b/packages/rollup-plugin-index-html/test/snapshots/external-loader/polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js.map
--- a/packages/rollup-plugin-index-html/test/snapshots/import-map/app.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/import-map/app.js
@@ -10,4 +10,4 @@ console.log('Loaded: /bar-fork/bar.js');

 console.log('my app');

-import('./index-bcce6317.js');
+import('./index-2778b37a.js');
--- a/packages/rollup-plugin-index-html/test/snapshots/import-map/index-2778b37a.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/import-map/index-2778b37a.js
--- a/packages/rollup-plugin-index-html/test/snapshots/import-map/index.html
+++ b/packages/rollup-plugin-index-html/test/snapshots/import-map/index.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>console.log("hello inline script");</script><script src="./app.js" type="module"></script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script src="./app.js" type="module"></script><script>console.log("hello inline script");</script></body></html>
--- a/packages/rollup-plugin-index-html/test/snapshots/inline-entry/index-2778b37a.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/inline-entry/index-2778b37a.js
--- a/packages/rollup-plugin-index-html/test/snapshots/inline-entry/index.html
+++ b/packages/rollup-plugin-index-html/test/snapshots/inline-entry/index.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title></head><body><script>console.log("hello inline script");</script><script src="./inline-entry.0.js" type="module"></script></body></html>
+<html lang="en-GB"><head><title>My app</title></head><body><script src="./inline-entry.0.js" type="module"></script><script>console.log("hello inline script");</script></body></html>
--- a/packages/rollup-plugin-index-html/test/snapshots/inline-entry/inline-entry.0.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/inline-entry/inline-entry.0.js
@@ -8,4 +8,4 @@ console.log('Loaded: /bar-fork/bar.js');

 console.log('my app');

-    import('./index-bcce6317.js');
+    import('./index-2778b37a.js');
--- a/packages/rollup-plugin-index-html/test/snapshots/js-entry/app.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/js-entry/app.js
@@ -1,4 +1,4 @@
 // @ts-nocheck
 /* eslint-disable */
 console.log('my app');
-import('./lazy-99ef5fe0.js');
+import('./lazy-ad0cfec5.js');
--- a/packages/rollup-plugin-index-html/test/snapshots/js-entry/index.html
+++ b/packages/rollup-plugin-index-html/test/snapshots/js-entry/index.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>console.log("hello inline script");</script><script src="./app.js" type="module"></script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script src="./app.js" type="module"></script><script>console.log("hello inline script");</script></body></html>
--- a/packages/rollup-plugin-index-html/test/snapshots/js-entry/lazy-ad0cfec5.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/js-entry/lazy-ad0cfec5.js
--- a/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/app.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/app.js
@@ -1,4 +1,4 @@
 // @ts-nocheck
 /* eslint-disable */
 console.log('my app');
-import('./lazy-99ef5fe0.js');
+import('./lazy-ad0cfec5.js');
--- a/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/index.html
+++ b/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/index.html
@@ -1 +1 @@
-<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>console.log("hello inline script");</script><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script src="polyfills/core-js.8e88fc5b880b02431d6fad7b3a34116d.js" nomodule=""></script><script src="polyfills/regenerator-runtime.61c01f337f4241bb46c77e10a7e01300.js" nomodule=""></script><script>!function(){function e(e,o){return new Promise(function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))})}var o=[];function t(){"noModule"in HTMLScriptElement.prototype?window.importShim("./app.js"):System.import("./legacy/app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js",!1)),o.length?Promise.all(o).then(t):t()}();</script></body></html>
+<html lang="en-GB"><head><title>My app</title><style>my-app{display:block}</style><link rel="preload" href="app.js" as="script" crossorigin="anonymous"></head><body><h1><span>Hello world!</span></h1><my-app></my-app><script>window.importShim=t=>import(t.startsWith(".")?new URL(t,document.baseURI):t);</script><script src="polyfills/core-js.77da473353460b142f5e09e540324336.js" nomodule=""></script><script src="polyfills/regenerator-runtime.323cb013cc2a9c88ff67ee256cbf5942.js" nomodule=""></script><script>console.log("hello inline script");</script><script>!function(){function e(e,o){return new Promise((function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))}))}var o=[];function t(){"noModule"in HTMLScriptElement.prototype?window.importShim("./app.js"):System.import("./legacy/app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype||o.push(e("polyfills/webcomponents.cc3976af76b5e726e2a7e86686c930f1.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.84b300ee818dce8b351c7cc7c100bcf7.js",!1)),o.length?Promise.all(o).then(t):t()}();</script></body></html>
--- a/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/lazy-ad0cfec5.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/lazy-ad0cfec5.js
--- a/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/legacy/app.js
+++ b/packages/rollup-plugin-index-html/test/snapshots/legacy-polyfills/legacy/app.js
@@ -6,7 +6,7 @@ System.register([], function (exports, module) {
 			// @ts-nocheck
 			/* eslint-disable */
 			console.log('my app');
-			module.import('./lazy-ab69e3de.js');
+			module.import('./lazy-9a97a738.js');

 		}
 	};
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
				`console.log('dynamically imported module');`
				`@@ -1 +0,0 @@`
				!function(){function e(e,o){return new Promise(function(t,n){document.head.appendChild(Object.assign(document.createElement("script"),{src:e,onload:t,onerror:n},o?{type:"module"}:void 0))})}var o=[];function t(){window.importShim("./app.js")}"noModule"in HTMLScriptElement.prototype&&!("importShim"in window)&&o.push(e("polyfills/dynamic-import.b745cfc9384367cc18b42bbef2bbdcd9.js",!1)),"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype\|\|o.push(e("polyfills/webcomponents.88b4b5855ede008ecad6bbdd4a69e57d.js",!1)),!("noModule"in HTMLScriptElement.prototype)&&"getRootNode"in Element.prototype&&o.push(e("polyfills/custom-elements-es5-adapter.551c76d38426de62c33d8c61995c1d0f.js",!1)),o.length?Promise.all(o).then(t):t()}();
				`@@ -1 +0,0 @@`
				`!function(){"use strict";!function(){if(void 0===window.Reflect\|\|void 0===window.customElements\|\|window.customElements.polyfillWrapFlushCallback)return;const t=HTMLElement;window.HTMLElement=function(){return Reflect.construct(t,[],this.constructor)},HTMLElement.prototype=t.prototype,HTMLElement.prototype.constructor=HTMLElement,Object.setPrototypeOf(HTMLElement,t)}()}();`
				`@@ -1 +0,0 @@`
				`{"version":3,"sources":["0"],"names":["window","Reflect","customElements","polyfillWrapFlushCallback","a","HTMLElement","construct","this","constructor","prototype","Object","setPrototypeOf"],"mappings":"CASC,WACC,cAEA,WAAY,QAAG,IAASA,OAAOC,cAAS,IAASD,OAAOE,gBAAgBF,OAAOE,eAAeC,0BAA0B,OAAO,MAAMC,EAAEC,YAAYL,OAAOK,YAAY,WAAuB,OAAOJ,QAAQK,UAAUF,EAAE,GAAGG,KAAKC,cAAcH,YAAYI,UAAUL,EAAEK,UAAUJ,YAAYI,UAAUD,YAAYH,YAAYK,OAAOC,eAAeN,YAAYD,GAAhW,GAHF"}`