fix: enable package exports for metro. fixes #842 (#843)

Author: satya164

.github/workflows/build-templates.yml

@@ -193,6 +193,10 @@ jobs:
         working-directory: ${{ env.work_dir }}
         if: matrix.type.language == 'js'
         run: |
+          # Clean up built JS files
+          # So we test that bundling works without any pre-built files
+          rm -rf lib/*
+
           yarn example expo export --platform web
 
       - name: Install JDK

packages/create-react-native-library/templates/expo-library/example/metro.config.js

@@ -10,7 +10,11 @@ const root = path.resolve(__dirname, '..');
  *
  * @type {import('metro-config').MetroConfig}
  */
-module.exports = withMetroConfig(getDefaultConfig(__dirname), {
+const config = withMetroConfig(getDefaultConfig(__dirname), {
   root,
   dirname: __dirname,
 });
+
+config.resolver.unstable_enablePackageExports = true;
+
+module.exports = config;