尝试返回与预期的 Promise 泛型类型相对应的 Promise -wrapped值，如下所示：

@Action
public async register(registerInfo: Account): Promise<boolean> {
  const res = await http.post('users/', registerInfo);
  return new Promise<boolean>((resolve, reject) => {
    resolve(res.data.success);
    // Or reject() if something wrong happened
  // Or simply return a resolved Promise
  return Promise.resolve(res.data.success);
}

实际上，您还应该能够 then() 结果：

@Action
public async register(registerInfo: Account): Promise<boolean> {
  return await http
            .post('users/', registerInfo)
            .then(res => res.data.success);