Withdrawn. The MagicMirror maintainer kindly pointed out that this is already covered by the built-in per-module animationSpeed: 0 config option — it gives an instant, blink-free content swap for any module that passes it through. Where a module hardcodes its fade duration, the correct fix is in that module (expose animationSpeed), not a separate global module.
I’ve corrected that in my own modules and withdrawn MMM-NoFade.
TL;DR: to stop a module from fading on updates, just set animationSpeed: 0 in that module’s config.
