JetBrains (available at https://www.jetbrains.com/) is a well-known company, and they are the creators of the Java IDE called IntelliJ IDEA, the very famous Visual Studio extension called ReSharper (which makes refactoring a breeze), and other tools such as TeamCity which is a Continuous Integration and Deployment server. Now, most of their tools are paid ones (except TeamCity, which has a free version available), and they have one more ace IDE for JavaScript called WebStorm (available at https://www.jetbrains.com/webstorm/). It is a cross-platform editor and has support for most of the modern web technologies such as AngularJS, React, Meteor, ES6, Dart, TypeScript, Node.js, and many more. It has refactoring support for JS code which spans not just a single file but also multiple files.

You can visit Go to definition for declaration of functions and variables and find their usages with Find usages. Its AngularJS support includes: