diff --git a/web/xec-web-components/package.json b/web/xec-web-components/package.json
--- a/web/xec-web-components/package.json
+++ b/web/xec-web-components/package.json
@@ -2,7 +2,6 @@
     "name": "react-component-library",
     "version": "1.0.0",
     "main": "build/index.js",
-    "module": "build/index.esm.js",
     "files": [
         "build"
     ],
@@ -63,7 +62,6 @@
         "rollup": "^2.56.3",
         "rollup-plugin-copy": "^3.4.0",
         "rollup-plugin-peer-deps-external": "^2.2.4",
-        "rollup-plugin-postcss": "^4.0.2",
         "rollup-plugin-typescript2": "^0.29.0",
         "ts-jest": "^26.5.6",
         "typescript": "^4.8.4"
diff --git a/web/xec-web-components/rollup.config.js b/web/xec-web-components/rollup.config.js
--- a/web/xec-web-components/rollup.config.js
+++ b/web/xec-web-components/rollup.config.js
@@ -3,22 +3,16 @@
 import commonjs from '@rollup/plugin-commonjs';
 import typescript from 'rollup-plugin-typescript2';
 
-const packageJson = require('./package.json');
-
 export default {
-    input: 'src/index.ts',
+    input: ['src/index.ts'],
     output: [
         {
-            file: packageJson.main,
+            dir: 'build',
             format: 'cjs',
             sourcemap: true,
         },
-        {
-            file: packageJson.module,
-            format: 'esm',
-            sourcemap: true,
-        },
     ],
+    preserveModules: true, // Important if we want to code split
     plugins: [
         peerDepsExternal(),
         resolve({