npm config set strict-ssl false

When you have issues like SECURE KEY CHAIN while doing npm install on Mac, use the command:

npm config set strict-ssl false

Struggled on the issue: Can't use fat arrow functions (ES6) in react

Hey, it's a known issue and here's the solution:

https://stackoverflow.com/questions/41464154/cant-use-fat-arrow-functions-es6-in-react