diff --git a/.changeset/spicy-carrots-attack.md b/.changeset/spicy-carrots-attack.md
new file mode 100644
index 0000000..5785721
--- /dev/null
+++ b/.changeset/spicy-carrots-attack.md
@@ -0,0 +1,5 @@
+---
+"overlay-kit": patch
+---
+
+feat: esm first (support cjs by exports field of package.json)
diff --git a/packages/package.json b/packages/package.json
index 37ec970..65a6a0a 100644
--- a/packages/package.json
+++ b/packages/package.json
@@ -19,21 +19,22 @@
     "email": "been.im@toss.im"
   },
   "sideEffects": false,
-  "main": "./dist/index.js",
-  "module": "./dist/index.mjs",
-  "types": "./dist/index.d.ts",
+  "type": "module",
+  "main": "dist/index.cjs",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
   "files": [
     "dist"
   ],
   "exports": {
     ".": {
       "import": {
-        "types": "./dist/index.d.mts",
-        "default": "./dist/index.mjs"
-      },
-      "require": {
         "types": "./dist/index.d.ts",
         "default": "./dist/index.js"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
       }
     },
     "./package.json": "./package.json"