CoolCatLib: Core

🐾 CoolCatLib: Core

Write it once, run it everywhere.

CoolCatLib: Core is the purr-fect foundation for your mods: events, networking, registries, configs and more, all written once in common code.

📦 Players: this is a library. Install it when a mod asks for it. On its own it adds nothing to your game.

✨ What's inside

🧩 Mod constructors

Write your mod's entry points once (common, client, dedicated server and data generation) and let Core wire them up. No loader-specific boilerplate.

📣 Events

A clean, ordered event system with phases, cancellable results and your own custom events. Built-ins cover server lifecycle and ticks, players, entities, blocks, commands, client ticks, HUD rendering, tooltips and more.

📡 Networking

Send payloads in both directions with a single call. Plain records don't even need a codec: Core builds one from their components (primitives, strings, Minecraft types, enums, lists, maps, optionals and nested records).

📚 Registries

DeferredRegister, creative tabs, reload listeners, block entity types, key mappings, menu screens and tooltip components, all from common code.

⚙️ Configs

A full config system with a beautiful in-game editor:

• Typed values, groups, presets, validation and migrations
• Client, common, server, world and startup scopes, with server sync
• Themed config screens with dark and light modes, search, categories, undo/redo and a color picker
• Live file reloading and /coolcatcore commands

🎒 Attachments, containers and menus

Attach synced data to entities, block entities, chunks and item stacks. Use ready-made containers, slot layouts and storage menus that other mods' pipes and tools can reach.

🧪 And more

Brewing recipes, data-generation helpers, chat formatting, codecs, math and color utilities.

🎨 Looking for visuals?

Screen effects, custom skies and GUI widgets live in CoolCatLib: Canvas, built on Core.

🐞 Issues and source

Found a bug? Report it on GitHub. Licensed under MPL-2.0.