Convert Coremods from JS to Java

[shartte]

Based on neoforged/FancyModLoader#79

This removes the need to load the JS engine if only NF is present, by removing our JS coremods and replacing them with Transformer based Java Coremods instead.

This also bumps JCC since it chokes on the subproject being present on the classpath as folders of classes, rather than jar files.

Coremods:

• MethodRedirector as the name implies, redirects method calls to other classes. This is based on a JSON file of target classes (as previously) to actually scan. I did not update the JSON file. Currently this is only used for redirecting finalizeSpawn all around the codebase to our hook class, which emits the corresponding event.
• ReplaceFieldComparisonWithInstanceOf is meant to replace expressions like stack.getItem() == Items.XYZ by stack.getItem() instanceof XYZ allowing mod subclassed items to work with Vanilla logic.
• ReplaceFieldWithGetterAccess replaces usage of this.field for private fields with use of the corresponding getter, allowing mods that subclass to change what the superclass uses.

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: b41b9de4c07b88b3a0cb19c80787f71bf60d2803.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:testframework:21.1.60-pr-785-coremods
• 📦 net.neoforged:neoforge:21.1.60-pr-785-coremods

Repository Declaration

In order to use the artifacts published by the PR, add the following repository to your buildscript:

repositories {
    maven {
        name 'Maven for PR #785' // https://github.com/neoforged/NeoForge/pull/785
        url 'https://prmaven.neoforged.net/NeoForge/pr785'
        content {
            includeModule('net.neoforged', 'testframework')
            includeModule('net.neoforged', 'neoforge')
        }
    }
}

MDK installation

In order to setup a MDK using the latest PR version, run the following commands in a terminal.
The script works on both *nix and Windows as long as you have the JDK bin folder on the path.
The script will clone the MDK in a folder named NeoForge-pr785.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr785
cd NeoForge-pr785
curl -L https://prmaven.neoforged.net/NeoForge/pr785/net/neoforged/neoforge/21.1.60-pr-785-coremods/mdk-pr785.zip -o mdk.zip
jar xf mdk.zip
rm mdk.zip || del mdk.zip

To test a production environment, you can download the installer from here.

[Matyrobbrt]

Currently, the field_to_instanceof transformer isn't used. If we decide to keep it, we should yeet its JSON file and make it similar to ReplaceFieldWithGetterAccess (i.e. having them declared in NeoForgeCoreMod)

[Matyrobbrt]

Just as a note for future™, we should start generating the finalize spawn targets file.

[neoforged-releases]

🚀 This PR has been released as NeoForge version 21.1.56.