The electrical code is surprisingly readable, and building a small shed with power, to code, is not substantially more expensive or time consuming than building

The electrical code is surprisingly readable, and building a small shed with power, to code, is not substantially more expensive or time consuming than building it not to code. UF-B and plain THWN-2 wire are not very expensive, especially for a short run. A second conduit is cheap. Ground rods are cheap, although installing them can be annoying. A disconnect switch is maybe $150 and is an extremely polite thing to have if a firefighter shows up and wants to disconnect a structure. Moldy Romex wire in a flooded conduit next to some random intended-for-indoor use Cat 6 cable with insulation that may degrade when wet is asking for trouble. 50mA leakage into that Cat 6 cable will kill you 100% dead under the wrong circumstances but will not trip a conventional breaker.