build failed: exit code 127 - reactjs

Question

created my project with my app
This is the project.json file. That I have created
{
"name": "detox",
"version": "0.0.1",
"private": true,
"scripts": {
"ios": "react-native run-ios",
"start": "node node_modules/react-native/local-cli/cli.js start",
"test": "jest",
"test:e2e":"navicotrackapp test",
"test:e2e:build":"navicotrackapp build"
},
"dependencies": {
"react": "16.6.1",
"react-native": "0.57.7"
},
"devDependencies": {
"babel-jest": "23.6.0",
"jest": "23.6.0",
"metro-react-native-babel-preset": "0.49.2",
"react-test-renderer": "16.6.1"
},
"jest": {
"preset": "react-native"
},
"detox": {
"configurations": {
"ios.sim.debug": {
"binaryPath": "ios/build/Build/Products/Debug-iphonesimulator/navicotrackapp.app",
"build": "xcodebuild -project ios/navicotrackapp.xcodeproj -scheme navicotrackapp -configuration Debug -sdk iphonesimulator -derivedDataPath ios/build",
"type": "ios.simulator",
"name": "iPhone XR"
}
}
}
}
However. When I ran the test this was the out come:
Questions:
What did I do wrong
How do I fix it?

Answer 1

For those coming with yarn 127 error code problem
Take a look on https://github.com/reactstrap/reactstrap/issues/711
Most probably you just need to run in console yarn :)

Answer 2

Replace your scripts values with these, and try again:
"scripts": {
"ios": "react-native run-ios",
"start": "node node_modules/react-native/local-cli/cli.js start",
"test": "jest",
"test:e2e":"npm run test",
"test:e2e:build":"npm run build" // THIS SCRIPT WILL STILL BREAK FOR YOU
},
The last two are the important ones!
You need to prefix a script command with npm run or yarn if the script references another script in your package.json.
So instead of a script calling navicotrackapp test it would call npm run test OR yarn test.
NOTE:
In you example it looks like the terminal is failing on the script navicotrackapp build. Know that you do not have a build script defined so if you replace the script with npm run build it will still fail. You'll need to add a build script in if you want it to work!
"scripts": {
"ios": "react-native run-ios",
"start": "node node_modules/react-native/local-cli/cli.js start",
"test": "jest",
"build": // DO SOMETHING HERE!!!!,
"test:e2e":"npm run test",
"test:e2e:build":"npm run build"
},

Answer 3

Try below commands it works for me
$ npm install #ionic/app-scripts#latest --save-dev
$ ionic serve

Answer 4

Just use https://app.netlify.com/drop to deploy manually on Netlify
first run this command
npm run build
OR
yarn run build
Then drag and drop the build folder on the website above.

Answer 5

Try this, and please take care of the spaces.
It worked for me though. I added CI= in the capital before npm run build. Double-check if you did git add. , git commit -m "first commit" and git push -u origin before your final deployment.