DecompilerMC VS yarn

Honestly the way I learned is just downloading the code (https://github.com/hube12/DecompilerMC or https://github.com/QuiltMC/quilt-mappings are probably the best ways right now) and poking around until I found what I was looking for.

I have no clue how item shadowing in 1.18 is possible but if you want to have a look at the source code you could try MCP Reborn which even allows you to modify the code and run it easily, though not all variables are deobfuscated. You can also use the official obfuscation mappings to manually decompile Minecraft (wiki article or use DecompilerMC to automate that task (with this method afaik nothing is obfuscated but there is no function to run the code. It would probably be quite easy to port the gradle tasks from MCP reborn or create your own but I’m not a Java dev so I’m not sure)

this tool for code with mojang mappings(no parameter names): https://github.com/hube12/DecompilerMC

You can use DecompilerMC to decompile the latest versions and MCP to decompile older versions. Minecraft's code is definitely a giant mess of spaghetti, although maybe not as bad as it used to be.

If you do wanna look at mc code though, you can use DecompilerMC, or just download the fabric example mod and run the genSources gradle task

If you do wanna deobfuscate and decompile it tho, look into yarn or DecompilerMC

2) Use this, it uses mojang mappings https://github.com/hube12/DecompilerMC 3) Use mcp-reborn (mcpconfig) which use modcoderpack mappings https://github.com/Hexeption/MCP-Reborn

Yarn, still going with its cleanroom meant to protect against a mappings set that no longer exists.

Does Omori have something like Yarn?

I doubt that, especially considering Mojang started releasing obfuscation maps for Java Edition AFTER the introduction of datapacks. Furthermore, even before Mojang started releasing obfuscation maps there have been resources to deobfuscate the game, some dating back to the alpha days. In addition, many modders have opted to continue to use community deobfuscators to mod the game as a result of the terms of use attached to the Mojang mappings, and as such they are still under active development, yarn being the most popular (to my knowledge) community mapping project. None of these community mappings are in violation of copyright law to my knowledge, and I know for a fact yarn in particular isn't.

Download yarn https://github.com/FabricMC/yarn and OpenJDK 16

If you do wanna deobfuscate and decompile it tho, look into yarn or DecompilerMC

get FabricMC/yarn

Yup, they also still have: https://github.com/FabricMC/yarn, which is pretty nice but still rather restrictive as far as reversing more of the intersting code goes. This is understandable due to the nature of reversing a closed source software. Indeed I hope a group emerges that is strictly doing it for educational purposes or to find vulns and report them :).