diff --git a/package.json b/package.json
index 8a4a7f5b8ca..60c27cc8b36 100644
--- a/package.json
+++ b/package.json
@@ -75,7 +75,7 @@
     "debug": "^4.1.1",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-blueprint-test-helpers": "^0.19.1",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
diff --git a/packages/-ember-data/ember-cli-build.js b/packages/-ember-data/ember-cli-build.js
index 379977383ff..73124edf3ea 100644
--- a/packages/-ember-data/ember-cli-build.js
+++ b/packages/-ember-data/ember-cli-build.js
@@ -16,6 +16,7 @@ module.exports = function (defaults) {
     },
     'ember-cli-babel': {
       throwUnlessParallelizable: true,
+      includeExternalHelpers: true,
     },
     'ember-cli-terser': {
       exclude: ['assets/dummy.js', 'assets/tests.js', 'assets/test-support.js', 'dist/docs/*', 'docs/*'],
diff --git a/packages/-ember-data/package.json b/packages/-ember-data/package.json
index afc346590c6..024587675af 100644
--- a/packages/-ember-data/package.json
+++ b/packages/-ember-data/package.json
@@ -33,7 +33,7 @@
     "@ember/string": "^1.0.0",
     "@glimmer/env": "^0.1.7",
     "broccoli-merge-trees": "^4.2.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-typescript": "^4.1.0",
     "ember-inflector": "^4.0.1"
   },
@@ -98,4 +98,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/adapter/package.json b/packages/adapter/package.json
index c534005c622..b7371419bdb 100644
--- a/packages/adapter/package.json
+++ b/packages/adapter/package.json
@@ -22,7 +22,7 @@
     "@ember-data/store": "3.29.0-alpha.3",
     "@ember/edition-utils": "^1.2.0",
     "@ember/string": "^1.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-test-info": "^1.0.0",
     "ember-cli-typescript": "^4.1.0"
   },
@@ -59,4 +59,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/canary-features/package.json b/packages/canary-features/package.json
index 4cb950033b7..6a8b52a0e67 100644
--- a/packages/canary-features/package.json
+++ b/packages/canary-features/package.json
@@ -14,7 +14,7 @@
   },
   "scripts": {},
   "dependencies": {
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-typescript": "^4.1.0"
   },
   "devDependencies": {
@@ -45,4 +45,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/debug/package.json b/packages/debug/package.json
index cadf3513860..456eac23b1d 100644
--- a/packages/debug/package.json
+++ b/packages/debug/package.json
@@ -20,7 +20,7 @@
     "@ember-data/private-build-infra": "3.29.0-alpha.3",
     "@ember/edition-utils": "^1.2.0",
     "@ember/string": "^1.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-test-info": "^1.0.0",
     "ember-cli-typescript": "^4.1.0"
   },
@@ -57,4 +57,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/model/package.json b/packages/model/package.json
index b32eb192770..d259bc91cfc 100644
--- a/packages/model/package.json
+++ b/packages/model/package.json
@@ -24,7 +24,7 @@
     "@ember/edition-utils": "^1.2.0",
     "@ember/string": "^1.0.0",
     "ember-cache-primitive-polyfill": "^1.0.1",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-string-utils": "^1.1.0",
     "ember-cli-test-info": "^1.0.0",
     "ember-cli-typescript": "^4.1.0",
@@ -64,4 +64,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/private-build-infra/package.json b/packages/private-build-infra/package.json
index 72bce0fe82b..f53e3397514 100644
--- a/packages/private-build-infra/package.json
+++ b/packages/private-build-infra/package.json
@@ -27,7 +27,7 @@
     "broccoli-rollup": "^4.1.1",
     "calculate-cache-key-for-tree": "^2.0.0",
     "chalk": "^4.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-path-utils": "^1.0.0",
     "ember-cli-string-utils": "^1.1.0",
     "ember-cli-typescript": "^4.1.0",
@@ -48,4 +48,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/private-build-infra/src/addon-build-config-for-data-package.js b/packages/private-build-infra/src/addon-build-config-for-data-package.js
index cb17ebdad64..d9c0918773f 100644
--- a/packages/private-build-infra/src/addon-build-config-for-data-package.js
+++ b/packages/private-build-infra/src/addon-build-config-for-data-package.js
@@ -2,6 +2,7 @@ const calculateCacheKeyForTree = require('calculate-cache-key-for-tree');
 const Funnel = require('broccoli-funnel');
 const merge = require('broccoli-merge-trees');
 const BroccoliDebug = require('broccoli-debug');
+const VersionChecker = require('ember-cli-version-checker');
 
 const rollupPrivateModule = require('./utilities/rollup-private-module');
 
@@ -159,6 +160,8 @@ function addonBuildConfigForDataPackage(PackageName) {
       let babel = this.addons.find((addon) => addon.name === 'ember-cli-babel');
       let externalDeps = this.externalDependenciesForPrivateModule();
 
+      const host = this._findHost();
+
       // don't print this for consumers
       if (this.isDevelopingAddon()) {
         // eslint-disable-next-line no-console
@@ -168,11 +171,15 @@ function addonBuildConfigForDataPackage(PackageName) {
           )}']`
         );
       }
+      let checker = new VersionChecker(this.project);
+      let emberVersion = checker.for('ember-source');
 
       let privateTree = rollupPrivateModule(tree, {
         packageName: PackageName,
         babelCompiler: babel,
         babelOptions: this.options.babel,
+        emberVersion: emberVersion,
+        emberCliBabelOptions: host.options && host.options['ember-cli-babel'] ? host.options['ember-cli-babel'] : {},
         onWarn: this._suppressUneededRollupWarnings.bind(this),
         externalDependencies: this.externalDependenciesForPrivateModule(),
         destDir: this.getOutputDirForVersion(),
diff --git a/packages/private-build-infra/src/utilities/rollup-private-module.js b/packages/private-build-infra/src/utilities/rollup-private-module.js
index b2740694a5f..ef946ccf4f1 100644
--- a/packages/private-build-infra/src/utilities/rollup-private-module.js
+++ b/packages/private-build-infra/src/utilities/rollup-private-module.js
@@ -12,12 +12,53 @@ module.exports = function rollupPrivateModule(tree, options) {
     destDir: '-private',
   });
 
+  const emberCliBabelOptions = {
+    // we leave our output as valid ES
+    // for the consuming app's config to transpile as desired
+    // so we don't want to compileModules to amd here
+    compileModules: false,
+
+    // we never need this on our own stuff
+    disableEmberDataPackagesPolyfill: true,
+
+    // TODO for the embroider world we want to leave our -private module
+    // as an es module and only transpile the few things we genuinely care about.
+    // ideally this would occur as a pre-publish step so that consuming apps would
+    // just see a `-private.js` file and not pay any additional costs.
+    // CURRENTLY we transpile the -private module fully acccording to the
+    // consuming app's config, so we must leave these enabled.
+    disablePresetEnv: false,
+    disableDebugTooling: false,
+    disableDecoratorTransforms: false,
+
+    throwUnlessParallelizable: true,
+
+    // consuming app will take care of this if needed,
+    // we don't need to also include
+    includePolyfill: false,
+
+    // defer to consuming app's selection
+    // necessary as only consuming app can set this, must only have
+    // one copy
+    includeExternalHelpers: options.emberCliBabelOptions.includeExternalHelpers || false,
+
+    extensions: ['js', 'ts'],
+  };
+
+  // and we don't want
+  // to convert imports to globals when real modules is possible
+  // this is necessary because compileModules: false forces globals
+  // conversion without it.
+  if (options.emberVersion.gte('3.27.0')) {
+    // TODO should we just set this all the time?
+    // yes, this needs to be "false" to disable it in 3.27+
+    // when compileModules is false (which it is)
+    emberCliBabelOptions.disableEmberModulesAPIPolyfill = false;
+  }
+
   let privateTree = babelCompiler.transpileTree(debugTree(withPrivate, 'babel-private:input'), {
     babel: babelOptions,
-    'ember-cli-babel': {
-      compileModules: false,
-      extensions: ['js', 'ts'],
-    },
+    'ember-cli-babel': emberCliBabelOptions,
   });
 
   privateTree = debugTree(privateTree, 'babel-private:output');
@@ -27,7 +68,7 @@ module.exports = function rollupPrivateModule(tree, options) {
       output: [
         {
           file: `${packageName}/-private.js`,
-          format: babelCompiler.shouldCompileModules() ? 'amd' : 'es',
+          format: 'amd',
           amd: { id: `${packageName}/-private` },
           exports: 'named',
         },
diff --git a/packages/record-data/package.json b/packages/record-data/package.json
index 2eb596d6ec6..62997a89823 100644
--- a/packages/record-data/package.json
+++ b/packages/record-data/package.json
@@ -24,7 +24,7 @@
     "@ember-data/private-build-infra": "3.29.0-alpha.3",
     "@ember-data/store": "3.29.0-alpha.3",
     "@ember/edition-utils": "^1.2.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-test-info": "^1.0.0",
     "ember-cli-typescript": "^4.1.0"
   },
@@ -70,4 +70,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/serializer/package.json b/packages/serializer/package.json
index 85173af96b7..c60cf97d9c5 100644
--- a/packages/serializer/package.json
+++ b/packages/serializer/package.json
@@ -20,7 +20,7 @@
   "dependencies": {
     "@ember-data/private-build-infra": "3.29.0-alpha.3",
     "@ember-data/store": "3.29.0-alpha.3",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-test-info": "^1.0.0",
     "ember-cli-typescript": "^4.1.0"
   },
@@ -58,4 +58,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/store/package.json b/packages/store/package.json
index 412c22a67ea..5fee67e499b 100644
--- a/packages/store/package.json
+++ b/packages/store/package.json
@@ -21,7 +21,7 @@
     "@ember-data/private-build-infra": "3.29.0-alpha.3",
     "@ember/string": "^1.0.0",
     "@glimmer/tracking": "^1.0.4",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-path-utils": "^1.0.0",
     "ember-cli-typescript": "^4.1.0"
   },
@@ -58,4 +58,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-adapter-encapsulation-test-app/package.json b/packages/unpublished-adapter-encapsulation-test-app/package.json
index dda66da9fd5..e7b50b4e55d 100644
--- a/packages/unpublished-adapter-encapsulation-test-app/package.json
+++ b/packages/unpublished-adapter-encapsulation-test-app/package.json
@@ -31,7 +31,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -55,4 +55,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-debug-encapsulation-test-app/package.json b/packages/unpublished-debug-encapsulation-test-app/package.json
index 85ea10e6996..b5c32fdccec 100644
--- a/packages/unpublished-debug-encapsulation-test-app/package.json
+++ b/packages/unpublished-debug-encapsulation-test-app/package.json
@@ -30,7 +30,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -54,4 +54,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-fastboot-test-app/package.json b/packages/unpublished-fastboot-test-app/package.json
index 04110556e5a..a6043cf7a7e 100644
--- a/packages/unpublished-fastboot-test-app/package.json
+++ b/packages/unpublished-fastboot-test-app/package.json
@@ -35,7 +35,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-fastboot": "^2.2.1",
     "ember-cli-fastboot-testing": "^0.2.3",
@@ -70,4 +70,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-model-encapsulation-test-app/package.json b/packages/unpublished-model-encapsulation-test-app/package.json
index 2805992432c..dc81602162a 100644
--- a/packages/unpublished-model-encapsulation-test-app/package.json
+++ b/packages/unpublished-model-encapsulation-test-app/package.json
@@ -31,7 +31,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -55,4 +55,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-record-data-encapsulation-test-app/package.json b/packages/unpublished-record-data-encapsulation-test-app/package.json
index 7381efb8d44..7c94152f2d2 100644
--- a/packages/unpublished-record-data-encapsulation-test-app/package.json
+++ b/packages/unpublished-record-data-encapsulation-test-app/package.json
@@ -31,7 +31,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -55,4 +55,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-relationship-performance-test-app/package.json b/packages/unpublished-relationship-performance-test-app/package.json
index a051ae87cd2..c4a4ba37d89 100644
--- a/packages/unpublished-relationship-performance-test-app/package.json
+++ b/packages/unpublished-relationship-performance-test-app/package.json
@@ -26,7 +26,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -53,4 +53,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-serializer-encapsulation-test-app/package.json b/packages/unpublished-serializer-encapsulation-test-app/package.json
index 0df87fe6517..50eb08259c7 100644
--- a/packages/unpublished-serializer-encapsulation-test-app/package.json
+++ b/packages/unpublished-serializer-encapsulation-test-app/package.json
@@ -30,7 +30,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "ember-cli": "~3.26.1",
     "ember-cli-app-version": "^5.0.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -54,4 +54,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/unpublished-test-infra/package.json b/packages/unpublished-test-infra/package.json
index 41e4bddffde..3ebbf805fee 100644
--- a/packages/unpublished-test-infra/package.json
+++ b/packages/unpublished-test-infra/package.json
@@ -19,7 +19,7 @@
   "dependencies": {
     "@ember-data/private-build-infra": "3.29.0-alpha.3",
     "@ember/edition-utils": "^1.2.0",
-    "ember-cli-babel": "^7.26.3",
+    "ember-cli-babel": "^7.26.6",
     "ember-cli-blueprint-test-helpers": "^0.19.2",
     "ember-cli-typescript": "^4.1.0",
     "ember-get-config": "^0.2.4",
@@ -55,4 +55,4 @@
     "node": "12.16.2",
     "yarn": "1.22.4"
   }
-}
+}
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index d3c601fa617..073405ecd56 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6627,7 +6627,7 @@ ember-cli-babel@^6.0.0-beta.4, ember-cli-babel@^6.3.0, ember-cli-babel@^6.8.1:
     ember-cli-version-checker "^2.1.2"
     semver "^5.5.0"
 
-ember-cli-babel@^7.0.0, ember-cli-babel@^7.1.0, ember-cli-babel@^7.1.2, ember-cli-babel@^7.11.0, ember-cli-babel@^7.12.0, ember-cli-babel@^7.13.0, ember-cli-babel@^7.13.2, ember-cli-babel@^7.19.0, ember-cli-babel@^7.20.5, ember-cli-babel@^7.22.1, ember-cli-babel@^7.23.0, ember-cli-babel@^7.23.1, ember-cli-babel@^7.26.2, ember-cli-babel@^7.26.3, ember-cli-babel@^7.4.0, ember-cli-babel@^7.7.3, ember-cli-babel@^7.8.0:
+ember-cli-babel@^7.0.0, ember-cli-babel@^7.1.0, ember-cli-babel@^7.1.2, ember-cli-babel@^7.11.0, ember-cli-babel@^7.12.0, ember-cli-babel@^7.13.0, ember-cli-babel@^7.13.2, ember-cli-babel@^7.19.0, ember-cli-babel@^7.20.5, ember-cli-babel@^7.22.1, ember-cli-babel@^7.23.0, ember-cli-babel@^7.23.1, ember-cli-babel@^7.26.2, ember-cli-babel@^7.4.0, ember-cli-babel@^7.7.3, ember-cli-babel@^7.8.0:
   version "7.26.4"
   resolved "https://registry.npmjs.org/ember-cli-babel/-/ember-cli-babel-7.26.4.tgz#b73d53592c05479814ca1770b3b849d4e01a87f0"
   integrity sha512-GibwLrBUVj8DxNMnbE5PObEIeznX6ohOdYHoSMmTkCBuXa/I9amRGIjBhNlDbAJj+exVKKZoEGAdrV13gnyftQ==
@@ -6660,6 +6660,39 @@ ember-cli-babel@^7.0.0, ember-cli-babel@^7.1.0, ember-cli-babel@^7.1.2, ember-cl
     rimraf "^3.0.1"
     semver "^5.5.0"
 
+ember-cli-babel@^7.26.6:
+  version "7.26.6"
+  resolved "https://registry.npmjs.org/ember-cli-babel/-/ember-cli-babel-7.26.6.tgz#322fbbd3baad9dd99e3276ff05bc6faef5e54b39"
+  integrity sha512-040svtfj2RC35j/WMwdWJFusZaXmNoytLAMyBDGLMSlRvznudTxZjGlPV6UupmtTBApy58cEF8Fq4a+COWoEmQ==
+  dependencies:
+    "@babel/core" "^7.12.0"
+    "@babel/helper-compilation-targets" "^7.12.0"
+    "@babel/plugin-proposal-class-properties" "^7.13.0"
+    "@babel/plugin-proposal-decorators" "^7.13.5"
+    "@babel/plugin-transform-modules-amd" "^7.13.0"
+    "@babel/plugin-transform-runtime" "^7.13.9"
+    "@babel/plugin-transform-typescript" "^7.13.0"
+    "@babel/polyfill" "^7.11.5"
+    "@babel/preset-env" "^7.12.0"
+    "@babel/runtime" "7.12.18"
+    amd-name-resolver "^1.3.1"
+    babel-plugin-debug-macros "^0.3.4"
+    babel-plugin-ember-data-packages-polyfill "^0.1.2"
+    babel-plugin-ember-modules-api-polyfill "^3.5.0"
+    babel-plugin-module-resolver "^3.2.0"
+    broccoli-babel-transpiler "^7.8.0"
+    broccoli-debug "^0.6.4"
+    broccoli-funnel "^2.0.2"
+    broccoli-source "^2.1.2"
+    clone "^2.1.2"
+    ember-cli-babel-plugin-helpers "^1.1.1"
+    ember-cli-version-checker "^4.1.0"
+    ensure-posix-path "^1.0.2"
+    fixturify-project "^1.10.0"
+    resolve-package-path "^3.1.0"
+    rimraf "^3.0.1"
+    semver "^5.5.0"
+
 ember-cli-blueprint-test-helpers@^0.19.1, ember-cli-blueprint-test-helpers@^0.19.2:
   version "0.19.2"
   resolved "https://registry.npmjs.org/ember-cli-blueprint-test-helpers/-/ember-cli-blueprint-test-helpers-0.19.2.tgz#9e563cd81ab39931253ced0982c5d02475895401"