diff --git a/aio/angular.json b/aio/angular.json
index 4940d34a23..7799e38f68 100644
--- a/aio/angular.json
+++ b/aio/angular.json
@@ -44,17 +44,7 @@
               "src/assets",
               "src/generated",
               "src/pwa-manifest.json",
-              "src/google385281288605d160.html",
-              {
-                "glob": "native-shim.js",
-                "input": "node_modules/@webcomponents/custom-elements/src",
-                "output": "/assets/js"
-              },
-              {
-                "glob": "es.reflect.construct.js",
-                "input": "node_modules/core-js/modules",
-                "output": "/assets/js"
-              }
+              "src/google385281288605d160.html"
             ],
             "styles": [
               "src/styles/main.scss"
@@ -156,17 +146,7 @@
               "src/assets",
               "src/generated",
               "src/pwa-manifest.json",
-              "src/google385281288605d160.html",
-              {
-                "glob": "native-shim.js",
-                "input": "node_modules/@webcomponents/custom-elements/src",
-                "output": "/assets/js"
-              },
-              {
-                "glob": "es.reflect.construct.js",
-                "input": "node_modules/core-js/modules",
-                "output": "/assets/js"
-              }
+              "src/google385281288605d160.html"
             ],
             "styles": [
               "src/styles/main.scss"
diff --git a/aio/ngsw-config.json b/aio/ngsw-config.json
index 15ff26a591..ce6c12bfaf 100644
--- a/aio/ngsw-config.json
+++ b/aio/ngsw-config.json
@@ -13,8 +13,6 @@
           "/assets/js/*.js",
           "/*.css",
           "/*.js",
-          "!/assets/js/es.reflect.construct.js",
-          "!/assets/js/native-shim.js",
           "!/*-es5*.js"
         ],
         "urls": [
@@ -41,8 +39,7 @@
       "resources": {
         "files": [
           "/assets/images/favicons/**",
-          "/assets/js/es.reflect.construct.js",
-          "/assets/js/native-shim.js",
+          "/generated/js/custom-elements-es5-polyfills.js",
           "/*-es5*.js",
           "!/**/_unused/**"
         ]
diff --git a/aio/package.json b/aio/package.json
index ecf325e6eb..92e37538c9 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -77,8 +77,10 @@
     "~~audit-web-app": "node scripts/audit-web-app",
     "~~check-env": "node scripts/check-environment",
     "~~clean-generated": "node --eval \"require('shelljs').rm('-rf', 'src/generated')\"",
+    "pre~~build": "yarn ~~build-ce-es5-polyfills",
     "~~build": "ng build --configuration=stable",
     "post~~build": "yarn build-404-page",
+    "~~build-ce-es5-polyfills": "esbuild src/custom-elements-es5-polyfills.js --bundle --minify | swc --config=minify=true --filename=custom-elements-es5-polyfills.js --out-file=src/generated/js/custom-elements-es5-polyfills.js --no-swcrc",
     "~~light-server": "light-server --bind=localhost --historyindex=/index.html --no-reload"
   },
   "//engines-comment": "Keep this in sync with /package.json and /aio/tools/examples/shared/package.json",
@@ -109,6 +111,8 @@
     "@angular-devkit/build-angular": "0.1102.2",
     "@angular/cli": "11.2.2",
     "@angular/compiler-cli": "11.2.3",
+    "@swc/cli": "^0.1.35",
+    "@swc/core": "^1.2.50",
     "@types/jasmine": "~3.6.0",
     "@types/lunr": "^2.3.2",
     "@types/node": "^12.7.9",
@@ -124,6 +128,7 @@
     "dgeni": "^0.4.13",
     "dgeni-packages": "^0.28.4",
     "entities": "^1.1.1",
+    "esbuild": "^0.9.0",
     "eslint": "^3.19.0",
     "eslint-plugin-jasmine": "^2.2.0",
     "find-free-port": "^2.0.0",
diff --git a/aio/src/custom-elements-es5-polyfills.js b/aio/src/custom-elements-es5-polyfills.js
new file mode 100644
index 0000000000..ed34c2c8ae
--- /dev/null
+++ b/aio/src/custom-elements-es5-polyfills.js
@@ -0,0 +1,15 @@
+/**
+ * Custom Elements polyfills for browsers that natively support Custom Elements but not ES2015
+ * modules.
+ *
+ * NOTE:
+ * Chrome, Firefox and Safari should not need these, because they added support for ES2015 modules
+ * before Custom Elements. It is still required for some other (less common) browsers:
+ *   - UC browser for android 11.8 (~3.5% global usage)
+ *   - Samsung browser 5.0-8.1 (~0.43% global usage)
+ *   - Opera 41-47 (~0.02% global usage)
+ */
+// @ts-nocheck
+
+require('core-js/modules/es.reflect.construct');  // Required by `native-shim.js`.
+require('@webcomponents/custom-elements/src/native-shim');
diff --git a/aio/src/index.html b/aio/src/index.html
index d1c727d45c..990b09bd90 100644
--- a/aio/src/index.html
+++ b/aio/src/index.html
@@ -110,16 +110,16 @@
   </noscript>
 
   <!--
-    Custom Element ES5 shim. Required for browsers that natively support Custom Elements, but do not
-    support ES2015 modules.
-    NOTE: Chrome, Firefox and Safari should not need this, because they added support for ES2015
-          modules before Custom Elements. It is still required for some other (less common) browsers:
-          - UC browser for android 11.8 (~3.5% global usage)
-          - Samsung browser 5.0-8.1 (~0.43% global usage)
-          - Opera 41-47 (~0.02% global usage)
+    Custom Elements polyfills required for browsers that natively support Custom Elements but not
+    ES2015 modules. (See `custom-elements-es5-polyfills.js` for more info.)
+
+    NOTE:
+    The polyfills here will be loaded before the ones in `polyfills.ts` (including
+    `@webcomponents/custom-elements`). This is fine, because the polyfills here are only needed on
+    browsers that natively support Custom Elements, on which `@webcomponents/custom-elements` will
+    be a no-op (so the order of loading does not matter).
   -->
-  <script src="assets/js/es.reflect.construct.js" nomodule></script>;
-  <script src="assets/js/native-shim.js" nomodule></script>;
+  <script src="generated/js/custom-elements-es5-polyfills.js" nomodule></script>
 
 </body>
 
diff --git a/aio/yarn.lock b/aio/yarn.lock
index c85a289324..98861aa78d 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -1603,6 +1603,11 @@
     call-me-maybe "^1.0.1"
     glob-to-regexp "^0.3.0"
 
+"@napi-rs/triples@^1.0.2":
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/@napi-rs/triples/-/triples-1.0.2.tgz#2ce4c6a78568358772008f564ee5009093d20a19"
+  integrity sha512-EL3SiX43m9poFSnhDx4d4fn9SSaqyO2rHsCNhETi9bWPmjXK3uPJ0QpPFtx39FEdHcz1vJmsiW41kqc0AgvtzQ==
+
 "@ngtools/webpack@11.2.2":
   version "11.2.2"
   resolved "https://registry.yarnpkg.com/@ngtools/webpack/-/webpack-11.2.2.tgz#647862ed19761796c7f84d5fb3305661d2a3af67"
@@ -1612,6 +1617,14 @@
     enhanced-resolve "5.7.0"
     webpack-sources "2.2.0"
 
+"@node-rs/helper@^1.0.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@node-rs/helper/-/helper-1.1.0.tgz#4fcbbebae3b81932d1ff3e431c7cd3886b504742"
+  integrity sha512-r43YnnrY5JNzDuXJdW3sBJrKzvejvFmFWbiItUEoBJsaPzOIWFMhXB7i5j4c9EMXcFfxveF4l7hT+rLmwtjrVQ==
+  dependencies:
+    "@napi-rs/triples" "^1.0.2"
+    tslib "^2.1.0"
+
 "@nodelib/fs.scandir@2.1.3":
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz#3a582bdb53804c6ba6d146579c46e52130cf4a3b"
@@ -1778,6 +1791,80 @@
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.14.0.tgz#9fb3a3cf3132328151f353de4632e01e52102bea"
   integrity sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==
 
+"@swc/cli@^0.1.35":
+  version "0.1.35"
+  resolved "https://registry.yarnpkg.com/@swc/cli/-/cli-0.1.35.tgz#e939fd374e889e3329ebdc48988e9e489d06f002"
+  integrity sha512-jjgfm8s+ueNAS8QaStpEXctn0O0AVfRR1vAocsFQyLysQkmbsnp8OyajaKgaLSUsdf4ZWlF8pKATPUPp869UEQ==
+  dependencies:
+    commander "^7.1.0"
+    convert-source-map "^1.6.0"
+    glob "^7.1.3"
+    lodash "^4.17.21"
+    slash "3.0.0"
+    source-map "^0.7.3"
+
+"@swc/core-android-arm64@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-android-arm64/-/core-android-arm64-1.2.50.tgz#763e5ad1a899e2ff0a914c8ac8134e573d8dc733"
+  integrity sha512-aPJGhHqRkNncZnG5fCRhdX9JHGQ7SJBykm7ER/F6nNuvuSTYbuv4wGLYzNVi2UmeSMQQH/9j1D5xcX8STGIgsw==
+
+"@swc/core-darwin-arm64@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-darwin-arm64/-/core-darwin-arm64-1.2.50.tgz#1ed630edef1b8864d3793e4133988b7281511239"
+  integrity sha512-ginmLsDGswvaENSDxhevBpq63iKAxKtVS0P53b9KvfOhRDtQpnXMIxc3iYeyII8D2QDR0HOQu/c1n2b6sUIuBQ==
+
+"@swc/core-darwin-x64@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-darwin-x64/-/core-darwin-x64-1.2.50.tgz#2e794feb5071cf4e7e20cedde872f4dfb77cd031"
+  integrity sha512-HJ2CFuzxIXwoo22jHr1ntuveqoHN0hbY7mUTXaRLWh9468TMeGmD20rm7l9FnOsBVH9m9psHGpOVNOUSEXg6tw==
+
+"@swc/core-linux-arm-gnueabihf@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-linux-arm-gnueabihf/-/core-linux-arm-gnueabihf-1.2.50.tgz#c7b9e2b35c7d9997004d6138c1c8115e14744cb7"
+  integrity sha512-y1rsaqmbO/rezCifX30ilqTKaeN4yp0pDpHri6hAMKqHOzNGZTrY7p3nmiCd425gFVpM72gcGNrDqbt9IqeOPA==
+
+"@swc/core-linux-arm64-gnu@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-linux-arm64-gnu/-/core-linux-arm64-gnu-1.2.50.tgz#1f41ac1fae0438641773098f254c9e1d72563d1f"
+  integrity sha512-eh1xpvPNoXiZBrkKLoM1JDXAH5U7zK+kebC7lXsPjPuPVGENfknAoT3oQvyohWnE7pf1nOPBiDX7wOT4T2e1Pw==
+
+"@swc/core-linux-x64-gnu@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-linux-x64-gnu/-/core-linux-x64-gnu-1.2.50.tgz#57ca45b5b5e67a12ff90b5f50a23559be65840e6"
+  integrity sha512-2I5OX66FQejeiJ4fuPS18AQieVk6H8Z2LfOgCuDMK2ZRQdc3gBe1rYVhZyCGdYXQ76mUlo6+phSy5qI63d172Q==
+
+"@swc/core-linux-x64-musl@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-linux-x64-musl/-/core-linux-x64-musl-1.2.50.tgz#c9225ec94618e75a5260264db7cd3122930e68f1"
+  integrity sha512-370yPM7+8tzEdiV3Y+RzkzukRfYeDiOS6oRCtpTqGmfh9RUhxyKQFM/gYRi77Qpgq6LnvY1eUQh+WrioCAztXg==
+
+"@swc/core-win32-ia32-msvc@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-win32-ia32-msvc/-/core-win32-ia32-msvc-1.2.50.tgz#8aca2e009d49f2cff44fe924115104565ce59d5c"
+  integrity sha512-sQOXq79ge8Bv07rh1bHZwiH5qXg8do28HdzhI8/VaFAh3K+8zTqOdF9DuOlf0Z/sE23znbbQcp3Hz30+5jhgWg==
+
+"@swc/core-win32-x64-msvc@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core-win32-x64-msvc/-/core-win32-x64-msvc-1.2.50.tgz#383ac624bdf0d7865013c6482392319afe2e8462"
+  integrity sha512-NmxSnkj7PYkN+e060tf0LR7knrdCzUobSmQrMwWlaC5dACHREFlo00mocL8AwB3WOZKvNp4MQv1cH3EaGbIpKw==
+
+"@swc/core@^1.2.50":
+  version "1.2.50"
+  resolved "https://registry.yarnpkg.com/@swc/core/-/core-1.2.50.tgz#d70daed948c9bb0ba8084e804e7fb2b1fcf0e19c"
+  integrity sha512-v4geRnqPqNBOAhWIT0ntcbw09mOxNy5XaGp4Nulxefpdpr8QUxPa1/9fLRPAbYjojT8yiqDtcLdx+yk+stFhpA==
+  dependencies:
+    "@node-rs/helper" "^1.0.0"
+  optionalDependencies:
+    "@swc/core-android-arm64" "^1.2.50"
+    "@swc/core-darwin-arm64" "^1.2.50"
+    "@swc/core-darwin-x64" "^1.2.50"
+    "@swc/core-linux-arm-gnueabihf" "^1.2.50"
+    "@swc/core-linux-arm64-gnu" "^1.2.50"
+    "@swc/core-linux-x64-gnu" "^1.2.50"
+    "@swc/core-linux-x64-musl" "^1.2.50"
+    "@swc/core-win32-ia32-msvc" "^1.2.50"
+    "@swc/core-win32-x64-msvc" "^1.2.50"
+
 "@szmarczak/http-timer@^1.1.2":
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/@szmarczak/http-timer/-/http-timer-1.1.2.tgz#b1665e2c461a2cd92f4c1bbf50d5454de0d4b421"
@@ -3950,6 +4037,11 @@ commander@^4.0.1:
   resolved "https://registry.yarnpkg.com/commander/-/commander-4.1.1.tgz#9fd602bd936294e9e9ef46a3f4d6964044b18068"
   integrity sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==
 
+commander@^7.1.0:
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-7.1.0.tgz#f2eaecf131f10e36e07d894698226e36ae0eb5ff"
+  integrity sha512-pRxBna3MJe6HKnBGsDyMv8ETbptw3axEdYHoqNh7gu5oDcew8fs0xnivZGm06Ogk8zGAJ9VX+OPEr2GXEQK4dg==
+
 commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
@@ -4113,7 +4205,7 @@ content-type@^1.0.4, content-type@~1.0.4:
   resolved "https://registry.yarnpkg.com/content-type/-/content-type-1.0.4.tgz#e138cc75e040c727b1966fe5e5f8c9aee256fe3b"
   integrity sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==
 
-convert-source-map@1.7.0, convert-source-map@^1.5.1, convert-source-map@^1.7.0:
+convert-source-map@1.7.0, convert-source-map@^1.5.1, convert-source-map@^1.6.0, convert-source-map@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.7.0.tgz#17a2cb882d7f77d3490585e2ce6c524424a3a442"
   integrity sha512-4FJkXzKXEDB1snCFZlLP4gpC3JILicCpGbzG9f9G7tGqGCzETQ2hWPrcinA9oU4wtf2biUaEH5065UnMeR33oA==
@@ -5391,6 +5483,11 @@ es6-weak-map@^2.0.1, es6-weak-map@^2.0.2:
     es6-iterator "^2.0.3"
     es6-symbol "^3.1.1"
 
+esbuild@^0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/esbuild/-/esbuild-0.9.0.tgz#b8320df85048ed1637c6b59ee52abba248936d3c"
+  integrity sha512-IqYFO7ZKHf0y4uJpJfGqInmSRn8jMPMbyI1W0Y2PSjSjJcVP538tC8TleJAS4Y8QeqwajqBTwFKayWVzYlMIgg==
+
 escalade@^3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/escalade/-/escalade-3.1.1.tgz#d8cfdc7000965c5a0174b4a82eaa5c0552742e40"
@@ -8708,6 +8805,11 @@ lodash@^4.17.19:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
   integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
 
+lodash@^4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+
 log-symbols@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/log-symbols/-/log-symbols-2.2.0.tgz#5740e1c5d6f0dfda4ad9323b5332107ef6b4c40a"
@@ -12337,7 +12439,7 @@ simple-swizzle@^0.2.2:
   dependencies:
     is-arrayish "^0.3.1"
 
-slash@^3.0.0:
+slash@3.0.0, slash@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"
   integrity sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==
@@ -13490,7 +13592,7 @@ ts-pnp@^1.1.6:
   resolved "https://registry.yarnpkg.com/ts-pnp/-/ts-pnp-1.2.0.tgz#a500ad084b0798f1c3071af391e65912c86bca92"
   integrity sha512-csd+vJOb/gkzvcCHgTGSChYpy5f1/XKNsmvBGO4JXS+z1v2HobugDz4s1IeFXM3wZB44uczs+eazB5Q/ccdhQw==
 
-tslib@2.1.0:
+tslib@2.1.0, tslib@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"
   integrity sha512-hcVC3wYEziELGGmEEXue7D75zbwIIVUMWAVbHItGPx0ziyXxrOMQx4rQEVEV45Ut/1IotuEvwqPopzIOkDMf0A==