Javascript Sapper不断收到客户关于'；这'；关键词？

不断从客户端获取此警告，但不完全确定是什么原因导致此警告。任何正确方向的指导都会非常有用

• client
The 'this' keyword is equivalent to 'undefined' at the top level of an ES module, and has been rewritten
1: var __extends = (this && this.__extends) || (function () {
                    ^
2:     var extendStatics = function (d, b) {
3:         extendStatics = Object.setPrototypeOf ||
The 'this' keyword is equivalent to 'undefined' at the top level of an ES module, and has been rewritten
1: var __extends = (this && this.__extends) || (function () {
                            ^
2:     var extendStatics = function (d, b) {
3:         extendStatics = Object.setPrototypeOf ||
The 'this' keyword is equivalent to 'undefined' at the top level of an ES module, and has been rewritten
1: var __assign = (this && this.__assign) || function () {
                   ^
2:     __assign = Object.assign || function(t) {
3:         for (var s, i = 1, n = arguments.length; i < n; i++) {
The 'this' keyword is equivalent to 'undefined' at the top level of an ES module, and has been rewritten
1: var __assign = (this && this.__assign) || function () {
                           ^
2:     __assign = Object.assign || function(t) {
3:         for (var s, i = 1, n = arguments.length; i < n; i++) {

•客户端
“this”关键字相当于ES模块顶层的“undefined”，已被重写
1:var u extends=（this&&this.u extends）| |（函数（）{
^
2:var extendStatics=功能（d，b）{
3:extendStatics=Object.setPrototypeOf||
“this”关键字相当于ES模块顶层的“undefined”，已被重写
1:var u extends=（this&&this.u extends）| |（函数（）{
^
2:var extendStatics=功能（d，b）{
3:extendStatics=Object.setPrototypeOf||
“this”关键字相当于ES模块顶层的“undefined”，已被重写
1:var u赋值=（this&&this.u赋值）| |函数（）{
^
2:uu assign=Object.assign | |函数（t）{
3:for（var s，i=1，n=arguments.length；i

我通过将以下代码添加到我的客户机汇总包中，解决了这个问题

上下文：“窗口”

以下是与此错误相关的文档：

---

看起来他们是在扫描传输包，而不是ES模块。