diff --git a/demo/webpack.config.ts b/demo/webpack.config.ts
index dedd475b..9fef0db0 100644
--- a/demo/webpack.config.ts
+++ b/demo/webpack.config.ts
@@ -22,6 +22,7 @@ const tsLoader = env => ({
   options: {
     compilerOptions: {
       module: env.bench ? 'esnext' : 'es2015',
+      declaration: false,
     },
   },
 });