Stack.ts

class Stack<TType extends any> {
    #revision = 0;
    #revisionOffset = 0;
    #items = [] as Array<TType>;
    #maximumSize: number;
    constructor(maxiumSize = 100) {
      if (maxiumSize < 1) {
        throw new TypeError("Minimum 'maximumSize' is 1.");
      }
      this.#maximumSize = maxiumSize;
    }
  
    push(item: TType) {
      this.#revision = this.#revision + 1;
      this.#items.push(item);
  
      const itemAmount = this.#items.length;
      if (itemAmount > this.#maximumSize) {
        this.#items.shift();
        this.#revisionOffset = this.#revisionOffset + 1;
      }
      return this.#revision;
    }
  
    getSince(lastRevision: number) {
      const realIndex = lastRevision + 1 - this.#revisionOffset;
      if (realIndex < 0) {
        return null;
      }
  
      return this.#items.slice(realIndex);
    }
  }