Set storybook folder to .storybook.

app/react-native/src/server/cli.js

@@ -28,7 +28,7 @@ function getCli() {
     .option('--quiet', 'Suppress verbose build output')
     .parse(process.argv);
 
-  const configDir = path.resolve(program.configDir || './storybook');
+  const configDir = path.resolve(program.configDir || './.storybook');
 
   return {
     ...program,

examples-native/crna-kitchen-sink/package.json

@@ -15,6 +15,7 @@
     "preset": "jest-expo"
   },
   "dependencies": {
+    "core-js": "^2.6.0",
     "expo": "^31.0.4",
     "prop-types": "^15.6.2",
     "react": "16.5.1",

lib/cli/generators/REACT_NATIVE/index.js

@@ -35,7 +35,7 @@ export default async npmOptions => {
     const projectName =
       dirname && dirname.slice('ios/'.length, dirname.length - '.xcodeproj'.length - 1);
     if (projectName) {
-      shell.sed('-i', '%APP_NAME%', projectName, 'storybook/storybook.js');
+      shell.sed('-i', '%APP_NAME%', projectName, '.storybook/storybook.js');
     } else {
       paddedLog(
         chalk.red(