Fix react-stately monopackage build script

Author: devongovett

packages/react-stately/package.json

@@ -12,7 +12,7 @@
   ],
   "sideEffects": false,
   "scripts": {
-    "prepublishOnly": "mkdir -p dist; cp src/index.ts dist/types.d.ts; cp src/index.ts dist/module.js; babel --root-mode upward src/index.ts -o dist/main.js"
+    "prepublishOnly": "mkdir -p dist; cp src/index.ts dist/types.d.ts; grep -v '^export type' src/index.ts > dist/module.js; babel --root-mode upward src/index.ts -o dist/main.js"
   },
   "repository": {
     "type": "git",