What steps can I take to resolve the error message stating "Type X is not compatible with Type Y" in TypeScript?

I'm encountering an issue with the middleware in my express app. Here is the code:

app.use(function(req, res, next) {
  let _end = res.end;
  res.end = function end(chunk, encoding) {
    ...
    return _end.call(res, chunk, encoding);
  };
  next();
});

However, I am facing a typescript error which states:

error TS2322: Type '(chunk: any, encoding: any) => any' is not assignable to type '{ (): void; (buffer: Buffer, cb?: Function): void; (str: string, cb?: Function): void; (str: stri...'.

The end method in @types/node/index.d.ts is described as follows:

end(): void;
end(buffer: Buffer, cb?: Function): void;
end(str: string, cb?: Function): void;
end(str: string, encoding?: string, cb?: Function): void;
end(data?: any, encoding?: string): void;

What would be the correct type to resolve this error?

Answer №1

Based on my observation, it seems like you are planning to utilize one of the available overloads:

end(data?: any, encoding?: string): void;
If this is indeed your intention, all you need to do is ensure that your function signature is explicitly compatible. Instead of

// ...
res.end = function end(chunk, encoding) {
// ...

try utilizing

// ...
res.end = function end(chunk?:any, encoding?:string) {
// ...

Also, remember to properly handle scenarios where arguments are not passed at all.

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