CurseForge · Minecraft mod
ProbeJS Legacy
Unofficial continuation of ProbeJS for versions abandoned by official ProbeJS
Quick answer
Which ProbeJS Legacy release should I use?
ProbeJS Legacy 6.2.0 targets 1.20.1 with Forge. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is ProbeJS Legacy required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does ProbeJS Legacy 6.2.0 need?
6.2.0. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add ProbeJS Legacy without breaking your instance.
Built for ProbeJS Legacy 6.2.0. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 6.2.0. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 6.2.0. It opens that exact file at the source.
About this project
What does ProbeJS Legacy add?
ProbeJS Legacy
is an unofficial continuation of ProbeJS for KubeJS versions abandoned by official ProbeJS.
Usage
- You need to install ProbeJS Legacy, obviously.
- Enter a singleplayer world. Use
/probejs dumpto export datas gathered by ProbeJS Legacy. For first-time users, this will be done automatically when you join the world. - Open your game instance folder using VSCode.
- Enjoy!
Note0: type @item or @block_tag to see snippets generated.
Note1: game instance folder is where you can see the kubejs folder directly.
Note2: Other IDEs with support for TypeScript typing (.d.ts) should also work.
New Features
(Compared to ProbeJS)
Simulated
Internal- ProbeJS Legacy will now generate a
Internalnamespace, allowing users to migrate from ProbeJS 6 or ProbeJS Legacy 3 easily. - Example:
Internal.ItemStackandInternal.ItemStack_
- ProbeJS Legacy will now generate a
Better Param Naming
- Param names that conflict with TypeScript will now be renamed in a better way.
- Param names in Method/Constructor, if in
arg123format, will be renamed to a new name generated from its type.
Example:
"mayUseItemAt"(arg0: $BlockPos$$Type, arg1: $Direction$$Type, arg2: $ItemStack$$Type): boolean
will be renamed to
"mayUseItemAt"(blockPos0: $BlockPos$$Type, direction1: $Direction$$Type, itemStack2: $ItemStack$$Type): boolean
Better
$Class<T>- ProbeJS will transform
$Class<T>intotypeof T, but ignoring many conditions where this should not be done. ProbeJS Legacy makes it more correct. - Some basic classes, for example
java.lang.Stringandjava.lang.Character. can now be dumped. - The
Tin$Class<T>is now actually usable for type hint.
- ProbeJS will transform
better
instanceof- ProbeJS Legacy can now properly support
obj instanceof $SomeClass, where$SomeClassis a class loaded viajava(...)orJava.loadClass(...).
- ProbeJS Legacy can now properly support
Example:
const $BoatItem = java("some.path.to.BoatItem")
let item = Item.of("boat").item; // here the type of `item` is `$Item`
if (item instanceof $BoatItem) {
// here the type of `item` can be inferred to `$BoatItem`
}
Field Beaning
- Some fields will be transformed into getter+setter, in order to provide better support for TypeWrapper
- Consider a
objwith a field like this:block: $Block, andobj.block = "minecraft:stone"is a valid syntax in KubeJS. This had no typing support before, but now ProbeJS Legacy can support it properly.
Typing files sharing
- By extracting common parts in dumped classes, the total typing files size can be much smaller than before.
- Another benefits is that TS server can now reuse common typings between 3 script types, improving IDE performance.
Better comment formatting
- blank lines at the front/back will now be ignored
- comments will be formatted as one line if there's only one valid line
Side only methods (marked by
@OnlyIn) will have comments telling you that it's server-only or client-only.xxx.d.tsfile with too many modules in it will now be split into smaller files automatically, providing better IDE performanceMethod/Field in declaration files are now naturally sorted.
gloablresolving: values you put intoglobalcan be resolved now. Configure resolving depth via'global' Resolving Depthconfig.And many internal changes. This Readme will certainly be too long if I write them all down.
Collecting data
KubeJS Event
For 1.16.5, ProbeJS Legacy will record all posted event. If you're unable to find some common events, try triggering it before dumping data. Example: block.place event is triggered by placing a block.
For 1.20.1, all registered KJS events will be dumped automatically, no need for triggering.
Forge Event
ProbeJS Legacy will record all Forge events, regardless of whether they have been posted or not. This behaviour can be altered via Class Scanner config.
Java Classes
ProbeJS Legacy will use multiple approaches for collecting Java classes.
These classes will be recorded:
- Classes loaded manually, aka those loaded via
java(...)orJava.loadClass(...) - Classes referenced by JS bindings, for example
AABBandText. - Classes references by known classes, for example
Item.classreferenced byItemStack.class. - Registry objects, for example
BoatItemfor vanilla boats. By default this will skip non-vanilla objects, and can be altered viaRegistry Object Filterconfig. - Classes from certain mods. See
Mods with forced Full Scanningconfig. - Classes read from cache file. The cache file is saved to
<your instance folder>/.probe/classes.txt. - Classes found by class scanner. See
Class Scannerconfig.
Why
Initially, all I want to do is just find some sort of doc or helper for KubeJS script writing, so that I won't need to feel such pain in the arse when developing Enlightend6Expert(https://www.curseforge.com/minecraft/modpacks/enlightened-6-expert) .
But after some research, I realized that 1.16.5, despite being one of the hottest modded versions, didn't even have a proper KubeJS helper mod.
So there it is, a ProbeJS fork for 1.16.5.
This is my first Java project and first Minecraft Mod project, and to be honest, ProbeJS is too tough for a coding noob like me. Thankfully I made it.
This project is licensed under LGPLv3, the same as the original ProbeJS.
Project description from CurseForge.
Pick your setup
ProbeJS Legacy by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.5
1 loader build1.20.4
1 loader build1.20.3
1 loader build1.20.2
1 loader build1.20.1
1 loader build1.16.5
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
ProbeJS Legacy versions and loaders
6.2.0
ProbeJSLegacy-1.20.1-6.2.0.jar
31 May 2026
6.2.0
ProbeJSLegacy-1.16.5-6.2.0.jar
31 May 2026
1.20.1-6.2.0
ProbeJSLegacy-1.20.1-6.2.0.jar
31 May 2026
1.16.5-6.2.0
ProbeJSLegacy-1.16.5-6.2.0.jar
31 May 2026
6.1.0
ProbeJSLegacy-1.20.1-6.1.0.jar
23 May 2026
6.1.0
ProbeJSLegacy-1.16.5-6.1.0.jar
23 May 2026
1.16.5-6.0.5
ProbeJSLegacy-1.16.5-6.0.5.jar
14 May 2026
1.20.1-6.0.5
ProbeJSLegacy-1.20.1-6.0.5.jar
14 May 2026
6.0.5
ProbeJSLegacy-1.20.1-6.0.5.jar
14 May 2026
6.0.5
ProbeJSLegacy-1.16.5-6.0.5.jar
14 May 2026
6.0.4
ProbeJSLegacy-1.20.1-6.0.4.jar
6 May 2026
6.0.4
ProbeJSLegacy-1.16.5-6.0.4.jar
6 May 2026
Looking for an older file? The official CurseForge project page is in Resources.