https://github.com/babel/ember-cli-babel/issues/419

Author: NullVoxPopuli

app/app.js

@@ -2,7 +2,9 @@ import Application from '@ember/application';
 import Resolver from 'ember-resolver';
 import loadInitializers from 'ember-load-initializers';
 import config from 'my-app/config/environment';
+
 import './input';
+import 'tracked-built-ins';
 
 export default class App extends Application {
   modulePrefix = config.modulePrefix;

package.json

@@ -71,6 +71,7 @@
     "edition": "octane"
   },
   "dependencies": {
-    "browserslist": "^4.17.4"
+    "browserslist": "^4.17.4",
+    "tracked-built-ins": "^2.0.0"
   }
 }

yarn.lock

@@ -1338,7 +1338,7 @@
     "@handlebars/parser" "^1.1.0"
     simple-html-tokenizer "^0.5.10"
 
-"@glimmer/tracking@^1.0.4":
+"@glimmer/tracking@^1.0.0", "@glimmer/tracking@^1.0.4":
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/@glimmer/tracking/-/tracking-1.0.4.tgz#f1bc1412fe5e2236d0f8d502994a8f88af1bbb21"
   integrity sha512-F+oT8I55ba2puSGIzInmVrv/8QA2PcK1VD+GWgFMhF6WC97D+uZX7BFg+a3s/2N4FVBq5KHE+QxZzgazM151Yw==
@@ -4731,7 +4731,7 @@ ember-cli-babel@^6.0.0-beta.4:
     ember-cli-version-checker "^2.1.2"
     semver "^5.5.0"
 
-ember-cli-babel@^7.0.0, ember-cli-babel@^7.13.0, ember-cli-babel@^7.13.2, ember-cli-babel@^7.21.0, ember-cli-babel@^7.22.1, ember-cli-babel@^7.23.0, ember-cli-babel@^7.23.1, ember-cli-babel@^7.26.5, ember-cli-babel@^7.26.6, ember-cli-babel@^7.7.3:
+ember-cli-babel@^7.0.0, ember-cli-babel@^7.13.0, ember-cli-babel@^7.13.2, ember-cli-babel@^7.21.0, ember-cli-babel@^7.22.1, ember-cli-babel@^7.23.0, ember-cli-babel@^7.23.1, ember-cli-babel@^7.26.3, ember-cli-babel@^7.26.5, ember-cli-babel@^7.26.6, ember-cli-babel@^7.7.3:
   version "7.26.6"
   resolved "https://registry.yarnpkg.com/ember-cli-babel/-/ember-cli-babel-7.26.6.tgz#322fbbd3baad9dd99e3276ff05bc6faef5e54b39"
   integrity sha512-040svtfj2RC35j/WMwdWJFusZaXmNoytLAMyBDGLMSlRvznudTxZjGlPV6UupmtTBApy58cEF8Fq4a+COWoEmQ==
@@ -4910,7 +4910,7 @@ ember-cli-typescript@^2.0.2:
     stagehand "^1.0.0"
     walk-sync "^1.0.0"
 
-ember-cli-typescript@^4.1.0:
+ember-cli-typescript@^4.1.0, ember-cli-typescript@^4.2.1:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/ember-cli-typescript/-/ember-cli-typescript-4.2.1.tgz#54d08fc90318cc986f3ea562f93ce58a6cc4c24d"
   integrity sha512-0iKTZ+/wH6UB/VTWKvGuXlmwiE8HSIGcxHamwNhEC5x1mN3z8RfvsFZdQWYUzIWFN2Tek0gmepGRPTwWdBYl/A==
@@ -5278,6 +5278,14 @@ ember-template-recast@^5.0.3:
     tmp "^0.2.1"
     workerpool "^6.1.4"
 
+ember-tracked-storage-polyfill@1.0.0, ember-tracked-storage-polyfill@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.npmjs.org/ember-tracked-storage-polyfill/-/ember-tracked-storage-polyfill-1.0.0.tgz#84d307a1e4badc5f84dca681db2cfea9bdee8a77"
+  integrity sha512-eL7lZat68E6P/D7b9UoTB5bB5Oh/0aju0Z7PCMi3aTwhaydRaxloE7TGrTRYU+NdJuyNVZXeGyxFxn2frvd3TA==
+  dependencies:
+    ember-cli-babel "^7.26.3"
+    ember-cli-htmlbars "^5.7.1"
+
 ember-welcome-page@^4.0.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/ember-welcome-page/-/ember-welcome-page-4.1.0.tgz#eab93852046140b28b36074ff1600e63a0b56973"
@@ -10644,6 +10652,26 @@ tr46@~0.0.3:
   resolved "https://registry.yarnpkg.com/tr46/-/tr46-0.0.3.tgz#8184fd347dac9cdc185992f3a6622e14b9d9ab6a"
   integrity sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o=
 
+tracked-built-ins@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.npmjs.org/tracked-built-ins/-/tracked-built-ins-2.0.0.tgz#fb8ad7f6ace27595b58e64df21fe308d82416701"
+  integrity sha512-+aB1jcGmDxi/0aMqGxL5KW3BUivrIU1bzgJW8yUAfnkxvdc1TBLmMOWAUFouD6ZTKH6w3eIrks18uLuASFCdcw==
+  dependencies:
+    ember-cli-babel "^7.26.6"
+    ember-cli-typescript "^4.1.0"
+    ember-tracked-storage-polyfill "^1.0.0"
+    tracked-maps-and-sets "^3.0.2"
+
+tracked-maps-and-sets@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.npmjs.org/tracked-maps-and-sets/-/tracked-maps-and-sets-3.0.2.tgz#6ea1b9f2a367d24f2e9905b74b24437fbce76ea6"
+  integrity sha512-UIRcWsX1kDOcC/Q2R58weYWlw01EnmWWBwUv3okWS+zMBvsgIfYoO6veHhuNE3hgzWCEImNp46QS5CyKnw5QUA==
+  dependencies:
+    "@glimmer/tracking" "^1.0.0"
+    ember-cli-babel "^7.26.6"
+    ember-cli-typescript "^4.2.1"
+    ember-tracked-storage-polyfill "1.0.0"
+
 tree-sync@^1.2.2:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/tree-sync/-/tree-sync-1.4.0.tgz#314598d13abaf752547d9335b8f95d9a137100d6"