Installing an npm Library in an Existing React Native App

Question

I am trying to install libraries from npmjs.com and save them as dependencies on my existing react native app. Installation instruction say to write npm install twit in terminal. So, in VScode, with the application open, I enter this in the terminal. After installation, the terminal will say something like:

+ react-native-twitter@0.2.1
added 3 packages, removed 945 packages and updated 1 package in 14.238s

Now I cannot run the application on the android simulator etc.

Can someone explain what I may be doing wrong and what kinds of libraries I can/cannot add? For example, must the library be built specifically for react/react native?

Thanks

error when running simulator:

react-native run-android

Command run-android unrecognized. Make sure that you have run npm install and that you are inside a react-native project.

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! AwesomeProject@0.0.1 android: react-native run-android

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the AwesomeProject@0.0.1 android script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in: npm ERR!
/Users/admin/.npm/_logs/2019-01-03T03_13_17_686Z-debug.logPackage.json:

{
  "name": "AwesomeProject",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest",
    "ios": "react-native run-ios",
    "android": "react-native run-android"
  },
  "dependencies": {
    "react": "16.6.3",
    "react-native": "0.57.8",
    "react-native-twitter": "^0.2.1"
  },
  "devDependencies": {
    "babel-jest": "23.6.0",
    "jest": "23.6.0",
    "metro-react-native-babel-preset": "0.48.5",
    "react-test-renderer": "16.6.3"
  },
  "jest": {
    "preset": "react-native"
  }
}

Answer 1

Can you tell the error when you run app in simulator?
Add your package.json file. It may be more helpful to find the answer.

You can recovery it using following step.

1. Go to package.json file and under the dependency delete react-native-twitter@0.2.1
2. Then delete your node file.
3. type cmd npm install
4. Then react-native run-android

Now you can run your app in previous version.