diff --git a/esbuild.js b/esbuild.js
index 1d10ac5..46c2910 100644
--- a/esbuild.js
+++ b/esbuild.js
@@ -4,6 +4,9 @@ require('esbuild').build({
   format: 'cjs',
   minify: true,
   outfile: 'build/index.js',
-  target: 'es5',
+  target: 'es6',
   external: ['react'],
+  define: {
+    'process.env.NODE_ENV': '"production"',
+  },
 }).catch(() => process.exit(1))