There aren't any digital rangefinders.
A rangefinder uses a non through the lens viewfinder, with a rangefinder patch in the middle that shifts left and right as you focus, when the patch lines up with its surroundings, you should be in focus.
It's crap for actually framing images, it's crap for focusing accurately, the only advantage it had over SLR cameras was a shorter flange distance and smaller body; something mirrorless digital cameras managed years ago.
Fuji and Leica both make fake rangefinders, with a crappy little window and a small digital screen to emulate the rangefinder patch, it's the worst of all worlds.
Fujis RF style cameras are known for having the worst electronic viewfinders on the market, but look how much more usable it is than the "rangefinder" window, which despite the tiny lens on the x100, still blocks 1\4 of the frame, imagine how bad that gets with a larger lens https://youtu.be/H6a7_NNP-t8