diff --git a/1-starter/tsconfig.json b/1-starter/tsconfig.json
index 646fe35..f5de8d5 100644
--- a/1-starter/tsconfig.json
+++ b/1-starter/tsconfig.json
@@ -9,7 +9,7 @@
     "allowSyntheticDefaultImports": true,
 
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
+    "emitDecoratorMetadata": false,
 
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
diff --git a/2-starter-with-api/tsconfig.json b/2-starter-with-api/tsconfig.json
index 646fe35..f5de8d5 100644
--- a/2-starter-with-api/tsconfig.json
+++ b/2-starter-with-api/tsconfig.json
@@ -9,7 +9,7 @@
     "allowSyntheticDefaultImports": true,
 
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
+    "emitDecoratorMetadata": false,
 
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
diff --git a/3-blank/tsconfig.json b/3-blank/tsconfig.json
index 646fe35..f5de8d5 100644
--- a/3-blank/tsconfig.json
+++ b/3-blank/tsconfig.json
@@ -9,7 +9,7 @@
     "allowSyntheticDefaultImports": true,
 
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
+    "emitDecoratorMetadata": false,
 
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
diff --git a/5-music-player-lavalink/tsconfig.json b/5-music-player-lavalink/tsconfig.json
index 646fe35..f5de8d5 100644
--- a/5-music-player-lavalink/tsconfig.json
+++ b/5-music-player-lavalink/tsconfig.json
@@ -9,7 +9,7 @@
     "allowSyntheticDefaultImports": true,
 
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
+    "emitDecoratorMetadata": false,
 
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
diff --git a/6-koa-server/tsconfig.json b/6-koa-server/tsconfig.json
index 646fe35..f5de8d5 100644
--- a/6-koa-server/tsconfig.json
+++ b/6-koa-server/tsconfig.json
@@ -9,7 +9,7 @@
     "allowSyntheticDefaultImports": true,
 
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
+    "emitDecoratorMetadata": false,
 
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
diff --git a/7-hot-module-reload/tsconfig.json b/7-hot-module-reload/tsconfig.json
index 646fe35..f5de8d5 100644
--- a/7-hot-module-reload/tsconfig.json
+++ b/7-hot-module-reload/tsconfig.json
@@ -9,7 +9,7 @@
     "allowSyntheticDefaultImports": true,
 
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
+    "emitDecoratorMetadata": false,
 
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true