U can setup base middleware system smth like this:

[haoynmail]

U can setup base middleware system smth like this:

const middlewares = [
   (res, req, next) => { ... },
   (res, req, next) => { ... }
];

const runMiddlewares = (res, req) => {
    let index = 0;

    const next = async () => {
        const nextMiddleware = middlewares[index++];
        const hasRespondEnded = res.finished; // this is CUSTOM property, see my comment below
        const shouldRunNextMiddleware = !hasRespondEnded && nextMiddleware;

        if (shouldRunNextMiddleware) {
            nextMiddleware(res, req, next);
        }
    };

    next();
};

App = new App().any('/*', runMiddlewares)

Unfortunately, today's HttpResponse API doesnt provide easy way to check if response has finished.
For now you propably might want to override the res.end and res.tryEnd methods:

const enhanceRes = (res) => {
     const originalEnd = res.end.bind(res);
     const originalTryEnd = res.tryEnd.bind(res);
     
     res.finished = false;
     
     res.end = (...args) => {
         originalEnd(...args);
         res.finished = true;
         return res;
     }
     
     res.tryEnd = (...args) => {
          const [ok, done] = originalTryEnd(...args);
          res.finished = done;
          return [ok, done]
     }
}

Originally posted by @kolodziejczak-sz in #483 (comment)

[haoynmail]

hello @kolodziejczak-sz

Please advise on the use about const enhanceRes=(res)=>{...}.

For example, I have a middleware array:
const middleware=[
(res, req, next)=>{...},
(res, req, next)=>{...}, (this position res.end (...), not executed later)
(res, req, next)=>{...},
];

I want the second middleware to send messages to the browser, while the third middleware does not execute. How to use enhancRes (res)

[DadiBit]

Also, please note that you can/should use a Proxy on apply. It automatically infers all types in typescript too!

[haoynmail]

Thank you for your reply.

I didn't understand your meaning. I don't want to do a type check.

I mean: how does the function enhanceRes=(res)=>{...} execute in the middleware system mentioned above.
For example: there are three routing functions in the middleware system

const middleware=[
(res, req, next)=>{...},
(res, req, next)=>{...}
(res, req, next)=>{...},
];
How do use the function enhanceRes=(res)=>{...} to make routing functions 1, 2 to run ,but 3 not. Or how do use the function enhanceRes=(res)=>{...} to make routing functions 1, 3 to run, but 2 not.