I am using Google Apps Script and was wondering if I could use any sort of editor outside of the one Google provides. (I purchased Sublime Text and would like to use that.)<
Another option to contemplate: using "AppsScript Color" Google Chrome plugin and GAS editor shortcuts.
Here you have a list of most useful shortcuts: https://opensourceseo.org/useful-tips-for-using-the-google-apps-script-editor/