diff --git a/.gitignore b/.gitignore
index bca51b3..c532600 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 node_modules/
+tslib.mjs
+
diff --git a/package.json b/package.json
index 76d8726..6811184 100644
--- a/package.json
+++ b/package.json
@@ -21,9 +21,19 @@
         "type": "git",
         "url": "https://github.com/Microsoft/tslib.git"
     },
+    "scripts": {
+        "prepare": "cp tslib.es6.js tslib.mjs"
+    },
     "main": "tslib.js",
     "module": "tslib.es6.js",
     "jsnext:main": "tslib.es6.js",
+    "exports": {
+        ".": {
+            "require": "./tslib.js",
+            "import": "./tslib.mjs"
+        }
+    },
     "typings": "tslib.d.ts",
     "sideEffects": false
 }
+