diff --git a/src/tsconfig.esm.json b/src/tsconfig.esm.json
index 6efc6a00..d6085367 100644
--- a/src/tsconfig.esm.json
+++ b/src/tsconfig.esm.json
@@ -2,6 +2,7 @@
   "compilerOptions": {
     "module": "esnext",
     "moduleResolution": "node",
+    "declaration": true,
     "outDir": "../release/esm",
     "target": "es5",
     "lib": [
diff --git a/src/tsconfig.json b/src/tsconfig.json
index 778087ca..2dbccb11 100644
--- a/src/tsconfig.json
+++ b/src/tsconfig.json
@@ -3,6 +3,7 @@
     "module": "amd",
     "moduleResolution": "node",
     "outDir": "../release/dev",
+    "declaration": true,
     "target": "es5",
     "lib": [
       "dom",