Declare fields as readonly

src/core/KeyDesign.ts

@@ -24,31 +24,31 @@ export class KeyDesign {
 	 * The bit allotments.
 	 */
 
-	private bits: Vector3;
+	private readonly bits: Vector3;
 
 	/**
 	 * The key range.
 	 */
 
-	private range: Vector4;
+	private readonly range: Vector4;
 
 	/**
 	 * A bit mask for the X-coordinate. The first item holds the low bits, the second one holds the high bits.
 	 */
 
-	private maskX: number[];
+	private readonly maskX: [number, number];
 
 	/**
 	 * A bit mask for the Y-coordinate. The first item holds the low bits, the second one holds the high bits.
 	 */
 
-	private maskY: number[];
+	private readonly maskY: [number, number];
 
 	/**
 	 * A bit mask for the Z-coordinate. The first item holds the low bits, the second one holds the high bits.
 	 */
 
-	private maskZ: number[];
+	private readonly maskZ: [number, number];
 
 	/**
 	 * Constructs a new key design.

src/core/KeyIterator.ts

@@ -11,37 +11,37 @@ export class KeyIterator implements Iterator<number>, Iterable<number> {
 	 * The key design.
 	 */
 
-	private keyDesign: KeyDesign;
+	private readonly keyDesign: KeyDesign;
 
 	/**
 	 * The lower index bounds.
 	 */
 
-	private min: Vector3;
+	private readonly min: Vector3;
 
 	/**
 	 * The upper index bounds.
 	 */
 
-	private max: Vector3;
+	private readonly max: Vector3;
 
 	/**
 	 * The base key coordinates.
 	 */
 
-	private keyBase: Vector3;
+	private readonly keyBase: Vector3;
 
 	/**
 	 * The current key iteration coordinates.
 	 */
 
-	private key: Vector3;
+	private readonly key: Vector3;
 
 	/**
 	 * The iteration limits.
 	 */
 
-	private limit: Vector3;
+	private readonly limit: Vector3;
 
 	/**
 	 * An iterator result.

src/core/Octree.ts

@@ -257,13 +257,13 @@ export class Octree<T> implements Tree, Iterable<OctantWrapper<T>> {
 	 * The level zero cell size.
 	 */
 
-	private cellSize: Vector3;
+	private readonly cellSize: Vector3;
 
 	/**
 	 * @see {@link keyDesign}
 	 */
 
-	private _keyDesign: KeyDesign;
+	private readonly _keyDesign: KeyDesign;
 
 	/**
 	 * The hierarchical octant grids.