Fabric

kit.versions.fabric reads the official Fabric meta API at meta.fabricmc.net.

import { Loaders, VersionPreference } from "@loontail/minecraft-kit";

const loaders = await kit.versions.fabric.list({ minecraftVersion: "1.20.1" });
const resolved = await kit.versions.fabric.resolve({
  minecraftVersion: "1.20.1",
  preference: VersionPreference.LATEST,
});

resolve fetches the profile JSON (the same one the official Fabric installer uses) and returns a ResolvedFabricLoader ready to be plugged into kit.targets.create.

Supported Minecraft versions

gameVersions() hits the upstream meta.fabricmc.net/v2/versions/game endpoint and returns the full set of Minecraft versions Fabric supports, independent of any specific loader. Each entry carries the upstream stable flag; the version field is branded as MinecraftVersionId so it plugs straight into the rest of the kit.

import type { FabricGameVersionEntry } from "@loontail/minecraft-kit";

const games: readonly FabricGameVersionEntry[] = await kit.versions.fabric.gameVersions();
const stable = games.filter((g) => g.stable).map((g) => g.version);

The response is cached via the shared metadata cache, so repeat calls are free.

Targets

const target = kit.targets.create({
  id: "fabric-client",
  directory: "./minecrafts/fabric-client",
  minecraft: resolvedMinecraft,
  loader: resolvedFabricLoader,
  runtime: resolvedRuntime,
});

When you install this target the kit downloads:

1. The vanilla client jar, libraries, assets, natives, asset index, logging config.
2. The Mojang Java runtime referenced by the manifest.
3. Every Fabric library declared in the profile.
4. versions/<fabric-id>/<fabric-id>.json containing the profile.

Nothing else lands on disk — no Fabric installer JAR, no profile entries elsewhere.