Yes – you can execute native Apps Script with Office 365 back end

gas-fakes emulates Google Apps Script in Node.js and now adds a Microsoft Graph backend, enabling developers to write Apps Script code that targets both Google Workspace and Microsoft 365. The CLI handles Azure authentication and scope translation, supporting keyless auth across Google and Microsoft platforms. This positions Apps Script as a cross-platform 'lingua franca' with pluggable backends for maintaining a single codebase across productivity suites.