我发现我打错了

从{'express'}

我发现，当您尝试在FrontEnd中调用backEnd时，会发生此问题.当我删除该行时，问题就解决了.

I found that this problem happens when you try to call backEnd stuff in your frontEnd. when I delete that line problem solved.

事实证明，我没有键入import语句，因为我使用单词 response 作为变量名，它是自动导入的.我不确定导入是来自React本身还是另一个VS代码自动完成扩展.

it turns out that I didn't type the import statement because I used the word response as a variable name, it was automatically imported. I'm not sure if the import was from React itself or another VS code auto-completion extension.