diff --git a/package.json b/package.json
index bbe93377d..552869b2c 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,7 @@
   ],
   "scripts": {
     "build:development": "webpack --progress --color",
-    "build:umd": "yarn build:development --mode production --config webpack.config.prod.babel.js",
-    "build:esm": "yarn build:development --mode production --config webpack.config.prod.esm.babel.js",
-    "build:production": "concurrently \"yarn build:umd\" \"yarn build:esm\"",
+    "build:production": "yarn build:development --mode production --config webpack.config.prod.babel.js",
     "build": "concurrently \"yarn build:development\" \"yarn build:production\"",
     "postbuild": "documentation build src/mermaidAPI.js src/config.js src/defaultConfig.js --shallow -f md --markdown-toc false > docs/Setup.md",
     "build:watch": "yarn build:development --watch",
diff --git a/webpack.config.prod.babel.js b/webpack.config.prod.babel.js
index 9d0dba459..6591d3ef9 100644
--- a/webpack.config.prod.babel.js
+++ b/webpack.config.prod.babel.js
@@ -1,7 +1,17 @@
 import { jsConfig } from './webpack.config.base';
 
-const minConfig = jsConfig();
-minConfig.mode = 'production';
-minConfig.output.filename = '[name].min.js';
+const umdConfig = jsConfig();
+umdConfig.mode = 'production';
+umdConfig.output.filename = '[name].min.js';
 
-export default [minConfig];
+const esmConfig = jsConfig();
+esmConfig.mode = 'production';
+esmConfig.output.library = {
+  type: 'module',
+};
+esmConfig.experiments = {
+  outputModule: true,
+};
+esmConfig.output.filename = '[name].esm.min.js';
+
+export default [umdConfig, esmConfig];
diff --git a/webpack.config.prod.esm.babel.js b/webpack.config.prod.esm.babel.js
deleted file mode 100644
index a4b3bbfa9..000000000
--- a/webpack.config.prod.esm.babel.js
+++ /dev/null
@@ -1,13 +0,0 @@
-import { jsConfig } from './webpack.config.base';
-
-const minConfig = jsConfig();
-minConfig.mode = 'production';
-minConfig.output.library = {
-  type: 'module',
-};
-minConfig.experiments = {
-  outputModule: true,
-};
-minConfig.output.filename = '[name].esm.min.js';
-
-export default [minConfig];