Some links why to use camelCase for constants:
// Bad
const SERVICE_URL = 'https://www.example.com';
// Good
const serviceUrl = 'https://www.example.com';https://github.com/airbnb/javascript#references https://github.com/mozilla/addon-sdk/wiki/Coding-style-guide https://github.com/facebook/react/blob/50af0341081460968cae4b739758266d032166fc/docs/_posts/2015-12-18-react-components-elements-and-instances.md https://github.com/elierotenberg/coding-styles/blob/master/es6.md http://hapijs.com/styleguide http://www.2ality.com/2015/02/es6-classes-final.html https://github.com/gocardless/angularjs-style-guide https://nodejs.org/api/events.html https://github.com/nzakas/understandinges6/blob/master/manuscript/01-Block-Bindings.md#constant-declarations