Method shift

github-actions/browserstack/set-browserstack-env.js:8319–8326

()

      var kMask = kSize - 1;
      var FixedCircularBuffer = class {
        constructor() {
          this.bottom = 0;
          this.top = 0;
          this.list = new Array(kSize);
          this.next = null;
        }
        isEmpty() {
          return this.top === this.bottom;
        }
        isFull() {
          return (this.top + 1 & kMask) === this.bottom;