Below is the TypeScript implementation of the voxel memory arena and chunk
manager, along with a headless Node.js test script. The code uses a flat
Uint32Array per chunk and a VoxelMath utility class that encapsulates all
bitwise operations for the 32-bit voxel bitmask.

Implementation (voxel_engine.ts)
typescript
 * Voxel Memory Arena / Chunk Manager
 * 
 * Each chunk is an 8x8x8 grid (512 voxels) stored in a single
Uint32Array(512).
 * Spatial indexing: x + (y * 8) + (z * 64)
 * 
 * 32-bit bitmask layout:
 *   bit 0          : filled flag (1 = solid, 0 = empty)
 *   bits 1-4       : point type (0-15)
 *   bits 5-16      : texture ID (0-4095)
 *   bits 17-23     : visible faces bitmask (up to 7 faces)
 *   bits 24-31     : unused (reserved for future use)
 */

/ Constants
export const CHUNK_SIZE = 8;
export const VOXELS_PER_CHUNK = CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE; // 512

/ Bit positions and masks for the voxel data
const BIT_FILLED = 0;
const BITS_POINT_TYPE = 1;
const BITS_TEXTURE_ID = 5;
const BITS_VISIBLE_FACES = 17;

const MASK_FILLED = 0x1;
const MASK_POINT_TYPE = 0xF;        // 4 bits
const MASK_TEXTURE_ID = 0xFFF;       // 12 bits
const MASK_VISIBLE_FACES = 0x7F;     // 7 bits


..

==

How to Run the Test
Save the implementation code as voxel_engine.ts.

Save the test code as test_voxel.ts.

Install TypeScript and ts-node if not already present:

bash
npm install -g typescript ts-node
Run the test:

bash
ts-node test_voxel.ts
The test will output a series of checkmarks and a final success message if all
assertions pass.

This implementation provides:

A flat memory model with one Uint32Array per chunk.

Efficient bitwise packing for all voxel properties via the VoxelMath class.

A Chunk class that handles local coordinate indexing and voxel access.

A ChunkManager (the voxel memory arena) for managing multiple chunks.

A headless test that verifies the bitmask operations and chunk functionality.