如何在typescript中对时间轴的元素进行分组

interface TimelineElement {
  time: string;
  content: string;
}

const timeline: TimelineElement[] = [
  { time: "2022-01-01", content: "事件A" },
  { time: "2022-02-01", content: "事件B" },
  { time: "2022-02-15", content: "事件C" },
  { time: "2022-03-01", content: "事件D" },
  { time: "2022-03-15", content: "事件E" },
];

function groupElementsByMonth(elements: TimelineElement[]): { [key: string]: TimelineElement[] } {
  const groups: { [key: string]: TimelineElement[] } = {};

  for (const element of elements) {
    const month = element.time.substr(0, 7); // 提取年月部分作为分组的key

    if (!groups[month]) {
      groups[month] = [];
    }

    groups[month].push(element);
  }

  return groups;
}

const groupedTimeline = groupElementsByMonth(timeline);