types/ws Type 'Server' is not generic

Suddenly getting this error:

TypeScript: ./..\..\node_modules\@types\ws\index.d.ts:328:18
       Type 'Server' is not generic.


Angular CLI: 13.3.11
Node: 16.13.2
Package Manager: npm 8.1.2
OS: win32 x64

Angular: 13.4.0
... common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router, service-worker

Package Version
@angular-devkit/architect 0.1303.11
@angular-devkit/build-angular 13.3.11
@angular-devkit/core 13.3.11
@angular-devkit/schematics 13.3.11
@angular/cli 13.3.11
@angular/pwa 13.3.11
@schematics/angular 13.3.11
rxjs 6.6.7
typescript 5.1.3

Already tried to update @types/ws to version ^8.13.0 with no success

I had the same issue
npm i @types/ws@8.5.4 worked for me.

I spent two days on this updating and downgrading @types/node and @types/express. In the end I updated my angular project from 14 to 15 and everything worked perfectly again.

We had this issue in the build pipeline of a -fairly old- Angular project. Peculiarly, it failed every other build, since June 2023. I managed to resolve the issue as explained below. My solution is based on the remark of Salmin Skenderovic below the answer of Zen Donegan.

1. In packages.json, I have added this dependency:

   "@types/ws" : "<8.5.5",

The assumption is that the bug is in @types/ws v8.5.5, so until it is fixed we want to use any version below 8.5.5.

2. Before compiling, I needed to run this once:

   npm i --legacy-peer-deps

This command updates package-lock.json. This configuration file "freezes" all Angular dependencies for the project to a currently working set.

I removed the folder node_modules/@types/ws and that worked for me.
Next time I'll install my package using npm i --legacy-peer-deps.

I had similar problem, but additionally I got following message: ../node_modules/@types/node/globals.d.ts:72:13 - error TS2403: Subsequent variable declarations must have the same type. Variable 'AbortSignal' must be of type '{ new (): AbortSignal; prototype: AbortSignal; abort(reason?: any): AbortSignal; timeout(milliseconds: number): AbortSignal; }', but here has type '{ new (): AbortSignal; prototype: AbortSignal; }'.

So, what I did is simply added two lines of code to the global.d.ts to the AbortSignal variable, as it was stated in the error message (btw there was already TODO comment from developers):

declare var AbortSignal: {
    prototype: AbortSignal;
    new(): AbortSignal;
    // TODO: Add abort() static
    abort(reason?: any): AbortSignal; // <--------------lines which I added
    timeout(milliseconds: number): AbortSignal; //------|
};

After that, converting to JS was without problems

When I encountered this error, I discovered that it was due to an issue in my @types/node package. I was on version 17 when I got the error. Every other major version I tried worked fine, no error.

So I don't think it is actually an issue with the ws module, as others have suggested, but rather an issue between ws and certain versions of @types/node.

I had a pretty old version of @types/node defined in my package.json which did not match my actual version of Node.js.

i removed that explicit dependency with
npm uninstall @types/node (and let npm do the magic with an actual peer dependency).