diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index afc60069837..32aa6a3aa49 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -76,6 +76,8 @@ jobs:
       - name: Build 🔧
         run: |
           npm run compile
+          # run additional compilation variants
+          npx lerna run compile
 
       - name: Unit tests
         run: npm run test:browser
@@ -111,6 +113,8 @@ jobs:
       - name: Build 🔧
         run: |
           npm run compile
+          # run additional compilation variants
+          npx lerna run compile
 
       - name: Unit tests
         run: npm run test:webworker
@@ -192,6 +196,8 @@ jobs:
         working-directory: experimental
         run: |
           npm run compile
+          # run additional compilation variants
+          npx lerna run compile
 
       - name: Unit tests
         working-directory: experimental
@@ -231,6 +237,8 @@ jobs:
         working-directory: experimental
         run: |
           npm run compile
+          # run additional compilation variants
+          npx lerna run compile
 
       - name: Unit tests
         working-directory: experimental
diff --git a/tsconfig.es5.json b/tsconfig.es5.json
index 3c83c51a2b0..89cefe2d438 100644
--- a/tsconfig.es5.json
+++ b/tsconfig.es5.json
@@ -1,6 +1,7 @@
 {
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
-    "target": "es5"
+    "target": "es5",
+    "downlevelIteration": true
   }
 }