diff --git a/packages/core/tsconfig.json b/packages/core/tsconfig.json
index 7da21222..13742340 100644
--- a/packages/core/tsconfig.json
+++ b/packages/core/tsconfig.json
@@ -18,6 +18,7 @@
     "moduleResolution": "Node",
     "noImplicitOverride": true,
     "noUnusedParameters": true,
+    "useDefineForClassFields": true,
     "forceConsistentCasingInFileNames": true,
     "paths": {
       "/*": [
diff --git a/packages/examples/tsconfig.json b/packages/examples/tsconfig.json
index 0b43681c..5034a586 100644
--- a/packages/examples/tsconfig.json
+++ b/packages/examples/tsconfig.json
@@ -15,6 +15,7 @@
     "moduleResolution": "Node",
     "noImplicitOverride": true,
     "noUnusedParameters": true,
+    "useDefineForClassFields": true,
     "forceConsistentCasingInFileNames": true,
     "lib": [
       "DOM",