@mcgui/core

Shared manifest validation, resource identifiers, font measurement, and sprite geometry for MCGUI. Initial profile: Minecraft Java 26.2, resource-pack format 88.0.

Exports parseManifest, manifestSchema, resourcePath, assetUrl, measureText, spriteSlices, normalizeSliderValue, progressGeometry, chestLayout, text formatting/wrapping helpers, JAVA_26_2 resource/layout profiles, and their TypeScript types. New sprite and container roles are optional in the schema so existing manifests still parse; components requiring absent assets request re-extraction. No Minecraft assets are included. See the workspace README for setup and compatibility.

Inventory helpers: clickInventory, quickMoveInventory, distributeInventory, canDistributeTo, and validateInventory, with ItemStack, InventoryState, InventoryRules, and InventoryButton types. They return immutable state for pickup/place/split/merge/swap, ordered quick transfers, and left/right drag distribution. The application supplies stack identity, placement/removal rules, capacities, and transfer destinations. No React, game assets, or game simulation is involved.

Creative helpers: pickCreativeItem implements infinite catalogue pickup, Shift-click full stacks, matching-stack increments/decrements and middle-click cloning. copyCreativeToSlot copies a full stack into a target hotbar slot without changing the carried item. filterCreativeItems filters app-owned names/IDs, category membership and #tags. CREATIVE_LAYOUT, creativeTabPosition, creativeScrollRows and CREATIVE_TAB_SPRITES describe the 26.2 screen geometry and resource IDs.