Design a Stack With Increment Operation LeetCode solution in JavaScript

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var CustomStack = function (maxSize) {
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  this.stack = new Array(maxSize).fill(-1);
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  this.maxSize = maxSize;
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  this.size = 0;
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};
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CustomStack.prototype.push = function (x) {
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  if (this.size < this.maxSize) {
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    this.stack[this.size] = x;
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    this.size++;
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  }
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};
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CustomStack.prototype.pop = function () {
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  if (this.size > 0) {
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    this.size--;
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    return this.stack[this.size];
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  }
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  return -1;
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};
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CustomStack.prototype.increment = function (k, val) {
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  let count = k >= this.size ? this.size - 1 : k - 1;
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  while (count >= 0) {
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    this.stack[count] += val;
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    count--;
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  }
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};