src/types/chunk.ts

export interface ChunkPosition {
  x: number;
  z: number;
}

export interface ChunkSection {
  y: number;
  blocks: Uint16Array; // 16x16x16 blocks
  dirty: boolean;
  light: {
    sky: Uint8Array;
    block: Uint8Array;
  };
}

export interface ChunkData {
  position: ChunkPosition;
  sections: ChunkSection[];
  biomeMap: Uint8Array; // 16x16x4 biomes
  heightmaps: {
    motionBlocking: Uint16Array; // 16x16 height values
    motionBlockingNoLeaves: Uint16Array;
    oceanFloor: Uint16Array;
  };
  entities: Entity[];
  lastUpdate: number;
}