问 我可以使用TypeScript在同步函数中等待异步操作循环完成吗？

可以，停那儿吧。让每一个你称之为承诺的行动。将所有这些承诺保存为一个数组，然后调用 Promise.all

const promises:Promise<{}>[] = [];
myWhatever.forEach(
    item => {
         const promise = new Promise<{}>(
             (resolve, reject) => {
                 // Do something which ends up with resolve getting called
                 // at some point
         promises.push(promise);
Promise.all(promises)
   .then(
      () => {
          // Perform your post render tasks here
    );

您可以通过用 map 替换 forEach 来进一步简化这一过程

const promises = myWhatever.map(
    item =>
        new Promise<{}>(
             (resolve, reject) => {
                 // Do something which ends up with resolve getting called
                 // at some point