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OP: Did you try this on Mac? I'm pretty sure Electron is only being used on Windows and Linux unless they recently made the switch..

You're totally right, just checked. Never even crossed my mind that they wouldn't be. Updated the post.

AFAIK Electron has always been cross platform. But yes it is very much on available on Mac.

I think he means whether the Slack app is using Electron on OS X. At one point they used MacGap.