fix: don't use extensions for files in package.json

this will let us use files like index.native.js to provide platform specific implementations

Author: satya164

templates/common/$package.json

@@ -2,11 +2,11 @@
   "name": "<%= project.slug %>",
   "version": "0.1.0",
   "description": "<%= project.description %>",
-  "main": "lib/commonjs/index.js",
-  "module": "lib/module/index.js",
+  "main": "lib/commonjs/index",
+  "module": "lib/module/index",
   "types": "lib/typescript/src/index.d.ts",
-  "react-native": "src/index.tsx",
-  "source": "src/index.tsx",
+  "react-native": "src/index",
+  "source": "src/index",
   "files": [
     "src",
     "lib",

templates/expo-library/example/$package.json

@@ -3,7 +3,7 @@
   "description": "Example app for <%= project.slug %>",
   "version": "0.0.1",
   "private": true,
-  "main": "index.js",
+  "main": "index",
   "scripts": {
     "android": "expo start --android",
     "ios": "expo start --ios",