I gave it a try and it says "illegal return statement." There's probably an easy fix for it, but unfortunately I'm an idiot about coding
Viewing post in Minimap for RPG Maker MV & MZ comments
Oh, don't worry, it's not your fault, mate! Itch.io destroyed the formatting a little bit.
I quickly made a ready-to-use plugin for you: downloads.aerosys.blog/plugins/MK_Minimap_fixedViewRange.js
You can quickly set the view distance in the Plugin Manager.