Fabric Language Kotlin Mod Wiki

Fabric Language Kotlin (FLK) is a backend utility and core library mod designed to bridge the gap between the Minecraft Fabric modding toolchain and the Kotlin programming language. Developed and maintained by modmuss50 and the Fabric team, this mod serves as a prerequisite for numerous popular mods, including Tech Reborn and Reborn Core.

Unlike traditional content mods, Fabric Language Kotlin does not add physical items, blocks, or mobs to the game world. Instead, it provides the necessary environment for other mods written in Kotlin to function. It bundles the Kotlin standard library, reflection, and coroutines, ensuring that players do not need to manually install these components to run Kotlin-based mods.

The primary mechanic of this mod is the registration of a Language Adapter. In the Fabric ecosystem, mods typically use the default Java adapter. Fabric Language Kotlin introduces a specialized adapter that allows the Fabric Loader to interact with Kotlin-specific code structures.

Language Adapter Features

• Kotlin Object Support: Allows modders to use a Kotlin object as their main mod initializer, which is more idiomatic than the standard Java class approach.
• Entrypoint Flexibility: Supports various entrypoint types, including top-level functions, fields, and companion objects.
• Coroutines Integration: Facilitates the use of Kotlin Coroutines for non-blocking, asynchronous tasks within the Minecraft environment.

Bundled Libraries

Fabric Language Kotlin bundles several key components of the Kotlin ecosystem to ensure version parity across all installed mods:

For mod developers, this library simplifies the process of using Kotlin by handling the boilerplate of shadowing or bundling Kotlin libraries. To utilize this mod, developers specify the kotlin adapter in their project configuration.

Configuration Example

In the fabric.mod.json file, developers define their entrypoints using the Kotlin adapter as follows:

{
 "schemaVersion": 1,
 "entrypoints": {
 "main": [
 {
 "adapter": "kotlin",
 "value": "com.example.mod.MyMod"
 }
 ]
 },
 "depends": {
 "fabric-language-kotlin": ">=1.10.0"
 }
}

This configuration tells the Fabric Loader to use the Kotlin adapter provided by this mod to initialize the specified class or object.

As a Language Library, Fabric Language Kotlin does not add any items, blocks, or mobs to Minecraft directly. Its role is to provide the code framework that allows other mods to add these features using the Kotlin language.

If you are looking for content such as machines, ores, or creatures, they are provided by the mods that depend on this library. Notable examples include:

• Tech Reborn: Adds advanced machinery, power systems, and ores.
• Wireless Networks: Adds blocks for wireless energy and data transfer.
• Reborn Core: A shared library for many of modmuss50's content mods.

Fabric Language Kotlin is required whenever a mod you have downloaded was written in Kotlin. Without it, the game will fail to load and will display an error message indicating a missing dependency.

Requirements

Installation Steps

1. Ensure the Fabric Loader is installed for your Minecraft version.
2. Download the fabric-language-kotlin JAR file.
3. Place the JAR file into your Minecraft mods folder.
4. Launch the game. The library will load silently in the background, enabling all dependent mods to function correctly.

Fabric Language Kotlin is designed for maximum compatibility within the Fabric ecosystem. It is a "transparent" mod, meaning it does not conflict with other mods or change vanilla gameplay mechanics. It is frequently updated to include the latest stable versions of the Kotlin runtime, ensuring that mods can take advantage of the newest language features without causing crashes or version conflicts with other Kotlin-based mods.