find the range of all nodes in a linked list in typescript

index.ts
class Node {
  value: number;
  next: Node | null;

  constructor(value: number, next: Node | null = null) {
    this.value = value;
    this.next = next;
  }
}

function getRange(head: Node | null): [number, number] | null {
  if (head === null) {
    return null;
  }

  let min = head.value;
  let max = head.value;

  let current = head.next;
  while (current !== null) {
    min = Math.min(min, current.value);
    max = Math.max(max, current.value);
    current = current.next;
  }

  return [min, max];
}
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