Is it possible to create a global configuration setting? For example, I want all of my clasp pull/clone commands to use .js. I know I can do this by setting the fileExtension property in the .clasp.json in the project directory but then I have to set it for each file. Is it possible to set it globally somewhere, like maybe in the .clasprc.json file?
The .clasprc.json file is the file used to store the Apps Script credentials and API tokens, so it is not a configuration file. I haven't seen anything related to this in the github documentation. The closest solution as you know is editing the Project Settings File (.clasp.json).