diff --git a/package.json b/package.json
index 72a6455..62aa60e 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,15 @@
         "type": "git",
         "url": "https://github.com/Microsoft/tslib.git"
     },
-    "main": "tslib.js",
+    "main": "tslib.cjs",
+    "type": "module",
+    "exports": {
+        ".": {
+            "import": "./tslib.es6.js",
+            "default": "./tslib.cjs"
+        },
+        "./": "./"
+    },
     "module": "tslib.es6.js",
     "jsnext:main": "tslib.es6.js",
     "typings": "tslib.d.ts",
diff --git a/tslib.js b/tslib.cjs
similarity index 100%
rename from tslib.js
rename to tslib.cjs