title: How can I clean (reset cache) of React Native using Expo. Not sure if it is cache issue
body: <p>I am building a simple React Native app with create-react-native-app using only react-navigation and base-64(base 64 encode/decode) as dependencies. Over time starting the app became slower and now sometimes it is getting stuck(waiting for about 30min) on "Starting packager..." after running NPM start.</p>
  
  <p>I've tried starting it with "npm start -- --reset-cache" but nothing changed</p>
  
  <p>Once it is up and running I don't get any error or warning in DevTools or terminal. Also there are no issues with the performance of the app</p>
  
  <p>What can I do to make NPM start smooth and quickly as before? Are there any general steps I can take to troubleshoot this issue?</p>
  
  <p>Here is my package.json</p>
  
  <pre><code>{
    "name": "test",
    "version": "0.1.0",
    "private": true,
    "devDependencies": {
      "jest-expo": "~27.0.0",
      "react-devtools": "^3.2.3",
      "react-native-scripts": "1.14.0",
      "react-test-renderer": "16.3.1"
    },
    "main": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
    "scripts": {
      "start": "react-native-scripts start",
      "eject": "react-native-scripts eject",
      "android": "react-native-scripts android",
      "ios": "react-native-scripts ios",
      "test": "jest"
    },
    "jest": {
      "preset": "jest-expo"
    },
    "dependencies": {
      "base-64": "^0.1.0",
      "expo": "^27.0.1",
      "react": "16.3.1",
      "react-native": "~0.55.2",
      "react-navigation": "^2.11.2"
    }
  }
  </code></pre>