Those of you who frequently send JavaScript attachments via Gmail will no longer be able to do so as Google has announced that the service will begin blocking JavaScript file attachments on the 13th of February.
Once the 13th of February arrives, any attempt to attach a .js file to an email will be greeted with a notification that warns you that the “content presents a potential security issue.” And just in case you decide to get creative with sending your JavaScript file, Google has made sure that Gmail will be able to detect the existance of a .js file even if they were to be sent as a compressed file (.zip etc). For those who require the use of a .js file, Google has suggested the use of Google Drive, Google Cloud Storage or other third-party cloud storage solutions.
JavaScript isn’t the first file format that was banned from being sent as an attachment. Some other files that were banned includes .exe, .bat and .msc files.
Source: G Suite Update, Engadget