diff --git a/package.json b/package.json
index 6fc7ec1..e9d88ee 100644
--- a/package.json
+++ b/package.json
@@ -15,8 +15,8 @@
     "node": ">=10"
   },
   "scripts": {
-    "build": "microbundle-crl --no-compress --format modern,cjs",
-    "start": "microbundle-crl watch --no-compress --format modern,cjs",
+    "build": "microbundle-crl -f cjs,umd src/index.cjs.js && microbundle-crl -f es,modern src/index.js",
+    "start": "microbundle-crl watch -f cjs,umd",
     "prepare": "run-s build",
     "test": "run-s test:unit test:lint test:build",
     "test:build": "run-s build",
diff --git a/src/index.cjs.js b/src/index.cjs.js
new file mode 100644
index 0000000..bfaca5a
--- /dev/null
+++ b/src/index.cjs.js
@@ -0,0 +1,23 @@
+import GoogleMap from './google_map';
+
+import {
+  convertNeSwToNwSe,
+  convertNwSeToNeSw,
+  fitBounds,
+  meters2ScreenPixels,
+  tile2LatLng,
+  latLng2Tile,
+  getTilesIds,
+} from './lib';
+
+Object.assign(GoogleMap, {
+  convertNeSwToNwSe,
+  convertNwSeToNeSw,
+  fitBounds,
+  meters2ScreenPixels,
+  tile2LatLng,
+  latLng2Tile,
+  getTilesIds,
+});
+
+export default GoogleMap;
diff --git a/src/index.js b/src/index.js
index ba33127..0b090aa 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,3 +1,13 @@
 import GoogleMap from './google_map';
 
+export {
+  convertNeSwToNwSe,
+  convertNwSeToNeSw,
+  fitBounds,
+  meters2ScreenPixels,
+  tile2LatLng,
+  latLng2Tile,
+  getTilesIds,
+} from './lib';
+
 export default GoogleMap;