diff --git a/tsconfig.commonjs.json b/tsconfig.commonjs.json
index b73f1dd6ad..5b0639f089 100644
--- a/tsconfig.commonjs.json
+++ b/tsconfig.commonjs.json
@@ -4,6 +4,7 @@
   ],
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
+    "declaration": true,
     "module": "commonjs",
     "outDir": "./lib.commonjs"
   }