diff --git a/.changeset/breezy-fireants-promise.md b/.changeset/breezy-fireants-promise.md
new file mode 100644
index 0000000..b38add2
--- /dev/null
+++ b/.changeset/breezy-fireants-promise.md
@@ -0,0 +1,7 @@
+---
+"astro-portabletext": patch
+---
+
+- Changes entry file extension to `.js`
+
+- Adds missing `main` field in package.json
diff --git a/component/lib/index.ts b/component/lib/index.js
similarity index 100%
rename from component/lib/index.ts
rename to component/lib/index.js
diff --git a/component/package.json b/component/package.json
index 136ce50..22bb166 100644
--- a/component/package.json
+++ b/component/package.json
@@ -19,8 +19,9 @@
     "url": "https://github.com/theisel/astro-portabletext/issues"
   },
   "homepage": "https://github.com/theisel/astro-portabletext#readme",
+  "main": "./lib/index.js",
   "exports": {
-    ".": "./lib/index.ts",
+    ".": "./lib/index.js",
     "./types": "./lib/types.ts"
   },
   "files": [