refactor: flag fixed queue internal storage data structure readonly

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

Author: jerome-benoit

src/queues/abstract-fixed-queue.ts

@@ -17,7 +17,7 @@ export abstract class AbstractFixedQueue<T> implements IFixedQueue<T> {
   /** @inheritdoc */
   public size!: number
   /** @inheritdoc */
-  public nodeArray: (FixedQueueNode<T> | undefined)[]
+  public readonly nodeArray: (FixedQueueNode<T> | undefined)[]
 
   /**
    * Constructs a fixed queue.

src/queues/queue-types.ts

@@ -26,7 +26,7 @@ export interface IFixedQueue<T> {
   /** The fixed queue size. */
   readonly size: number
   /** The fixed queue node array. */
-  nodeArray: (FixedQueueNode<T> | undefined)[]
+  readonly nodeArray: (FixedQueueNode<T> | undefined)[]
   /**
    * Checks if the fixed queue is empty.
    * @returns `true` if the fixed queue is empty, `false` otherwise.