Javascript is essential to all but the most basic pdf forms. In the 10 years that I have subscribed to Acrobat Pro for Mac, Acrobat Pro has never worked with an external javascript editor. It will most often open a script in an external editor but will NEVER permit the user to resume work in Acrobat when the editor is closed: Acrobat always - no exceptions - freezes at that point and must be forced to quit, then reopened. Users have complained about this for years. Adobe will sometimes blame Apple. Adobe never solves the problem and does not appear to care about its paying users, who deserve more respect than that. Please fix this.