Definitelytyped: [@types/express] error TS2694: '"...@types/express-serve-static-core/index"' has no exported member 'Params'

[ttous]

If you know how to fix the issue, make a pull request instead.

• [x] I tried using the @types/express package and had problems.
• [x] I tried using the latest stable version of tsc. https://www.npmjs.com/package/typescript
• [x] I have a question that is inappropriate for StackOverflow. (Please ask any appropriate questions there).
• [x] [Mention](https://github.com/blog/821-mention-somebody-they-re-notified) the authors (see Definitions by: in index.d.ts) so they can respond.
  
  
  
  • Authors: @borisyankov @CMUH
  
  

If you do not mention the authors the issue will be ignored.

---

Environment:
package.json

• "express": "^4.17.1"
• "@types/express": "^4.17.2"
• "typescript": "^3.7.3"

Action to reproduce the error:

tsc

Error encountered:

node_modules/@types/express/index.d.ts(90,50): error TS2694: Namespace '"C:/Users/ttoussaint/path/to/my/project/node_modules/@types/express-serve-static-core/index"' has no exported member 'Params'.
node_modules/@types/express/index.d.ts(90,64): error TS2694: Namespace '"C:/Users/ttoussaint/path/to/my/project/node_modules/@types/express-serve-static-core/index"' has no exported member 'ParamsDictionary'.
node_modules/@types/express/index.d.ts(90,90): error TS2315: Type 'ErrorRequestHandler' is not generic.
node_modules/@types/express/index.d.ts(99,38): error TS2694: Namespace '"C:/Users/ttoussaint/path/to/my/project/node_modules/@types/express-serve-static-core/index"' has no exported member 'Params'.
node_modules/@types/express/index.d.ts(99,52): error TS2694: Namespace '"C:/Users/ttoussaint/path/to/my/project/node_modules/@types/express-serve-static-core/index"' has no exported member 'ParamsDictionary'.
node_modules/@types/express/index.d.ts(99,78): error TS2315: Type 'Request' is not generic.
node_modules/@types/express/index.d.ts(100,45): error TS2694: Namespace '"C:/Users/ttoussaint/path/to/my/project/node_modules/@types/express-serve-static-core/index"' has no exported member 'Params'.
node_modules/@types/express/index.d.ts(100,59): error TS2694: Namespace '"C:/Users/ttoussaint/path/to/my/project/node_modules/@types/express-serve-static-core/index"' has no exported member 'ParamsDictionary'.
node_modules/@types/express/index.d.ts(100,85): error TS2315: Type 'RequestHandler' is not generic.

What I tried that DID _NOT_ work:

• rm -rf node_modules + npm i

What I tried that DID work:
In my package-lock.json, I could see the following:

"@types/express-serve-static-core": {
   "version": "4.16.2",
   ...
},

I added @types/express-serve-static-core@latest to my project's dependencies:
package.json

"@types/express-serve-static-core": "^4.17.0"

So now the package-lock.json looks like so:

"@types/express-serve-static-core": {
   "version": "4.17.0",
   ...
},

I cannot make a PR since the package.json file is not in this repository. This is still an issue, since @types/express-serve-static-core should not appear amongst my dependencies.

[lexicalninja]

thanks, @ttous s This fixed the same issue in my project.

[lafiosca]

Another approach is to remove all packages that depend on @types/express-serve-static-core and then re-add them.

[westonpace]

I wonder if this could be fixed by using a package.json to reference @types/express-serve-static-core@^4.17.1. I don't know enough about how definitely typed works but it appears it is generating a package.json with @types/express-serve-static-core@* which is incorrect.

[leehambley]

After a yarn add @types/express-serve-static-core@^4.17.1 (which has resolved to 4.17.2) this still didn't work for me without nuking yarn.lock and my node_modules/ directory.

After that things are fine, I just prefer not having a hard-coded transient dep in my tree.

[xinbenlv]

Same problem here.

[yasinkocak]

Same problem here with yarn

[sawpti]

Me funcionó esto:

sudo rm -rf node_modules
sudo rm yarn.lock,
sudo yarn

[DespertaWeb]

Worked for me:

rm yarn.lock
yarn
yarn start:dev

BTW:

sudo rm -rf node_modules
sudo rm yarn.lock,
sudo yarn

There's no need for sudo in there