optimized post install script, added typescript dev dependency

README.md

@@ -11,7 +11,7 @@ way to start your React Native project with TypeScript. Of course you can always
 ```
 react-native init MyApp --template typescript
 cd MyApp
-node scripts/install.sh
+node scripts/setup.sh
 ```
 
 ## :question: FAQ

devDependencies.json

@@ -1,4 +1,5 @@
 {
     "@types/react": "16.0.40",
-    "@types/react-native": "0.52.16"
+    "@types/react-native": "0.52.16",
+    "typescript": "2.7.2"
 }

index.js

@@ -1,4 +1,4 @@
 import { AppRegistry } from 'react-native';
 import App from './lib/App';
 
-AppRegistry.registerComponent('react-native-template-typescript', () => App);
+AppRegistry.registerComponent('HelloWorld', () => App);

scripts/setup.js

@@ -1,5 +1,6 @@
 const fs = require('fs');
 const path = require('path');
+const { execSync } = require('child_process');
 
 const packageJson = require('../package.json');
 const devDependencies = require('../devDependencies.json');
@@ -18,8 +19,17 @@ const writeFile = (fileName, data) => fs.writeFileSync(path.join(process.cwd(),
     if (!packageJson.devDependencies) {
         packageJson.devDependencies = {};
     }
-
     packageJson.devDependencies = Object.assign(packageJson.devDependencies, devDependencies);
+
+    if (!packageJson.scripts) {
+        packageJson.scripts = {};
+    }
+    packageJson.scripts = Object.assign(packageJson.scripts, { watch: './node_modules/.bin/tsc -w' })
+
     const data = JSON.stringify(packageJson, null, 2);
     writeFile('package.json', data);
+    execSync('npm i');
+    deleteFile('devDependencies.json');
 })();
+
+console.log('✅ Setup completed! You can now delete the scripts folder.')