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To my knowledge, Slack has always been an electron app. Did they use something else initially that was unnoticed?

In 2015, when we joined, Slack’s Mac app was using "MacGap" (i.e. the PhoneGap/Cordova model but for Mac). Electron was being used for Windows only, and it was a lot later that it became the platform for Slack’s Mac, Windows and Linux apps.

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