Social Engineering Self-XSS Warning Like Facebook

Self-XSS-Warning.js

if (process.env.NODE_ENV === 'production') {
  if (typeof window !== 'undefined' && typeof console === 'object' && typeof console.log === 'function') { // eslint-disable-line no-console
    console.log('%cWARNING!', 'color:white; background:red; font-size: 16pt'); // eslint-disable-line no-console
    console.log('%cThis is a browser feature intended for developers. Using this console may allow attackers to impersonate you and steal your information. Do not enter or paste code that you do not understand.', 'font-size: 14pt'); // eslint-disable-line no-console
  }
}