nodejs中express-http-context的用途是什么？

Question

i cant find the documentation for bindemitter in express-http-context.what is the use of this particular method?

 httpContext.ns.bindEmitter(req);
  httpContext.ns.bindEmitter(res);

Answer 1

bindEmitter is a function provided by one of express-http-context 's dependencies, namely cls-hooked and is described on their documentation :

Bind an EventEmitter to a namespace. [...]

The most likely time you'd want to use this is when you're using Express or Connect and want to make sure your middleware execution plays nice with CLS, or are doing other things with HTTP listeners [...]

So it basically allows you to ensure that req/res will be within the scope of the namespace that express-http-context has created and that this context is not lost.