Error: Cannot find module 'eslint/lib/rules/no-unused-expressions'

Question

After installing ESLint through NPM, I'm getting the following error in my browser:

Error: Cannot find module 'eslint/lib/rules/no-unused-expressions' Referenced from:

Any idea what could cause this and how I can fix it?

Answer 1

Try these steps:

1. Delete package-lock.json file
2. Delete node_modules folder
3. Delete .eslintrc file
4. Remove devDependencies that contains 'eslint'
5. In the terminal type: npm install
6. In the terminal type: npm run start

In case you want to have eslint, try checking if you have in your devDependencies the line below:

"eslint": "5.6.0"

1. NPM INSTALL ESLINT

Answer 2

I had this issue while using a create-react-app. React scripts already come with an eslint version installed and that means you shouldn't need to install eslint on your own. I fixed this issue by doing the following:

1. Deleted node-modules folder
2. Deleted my package-lock.json file
3. Removed my local installation of eslint from the package.json file
4. Installed all packages again npm install
5. npm start and everything was working fine again

Answer 3

Deleted node-modules folder
Deleted my package-lock.json file
Removed eslint from the package.json file
Installed all packages again

npm install   
npm start 

and everything was working fine again

Answer 4

Easy fix #1

npm i -D --save eslint-loader

Easy fix #2

npm i -D --save [email protected]

Explanation:

• If you look at the error stack trace you'll see the error is actually fired from eslint-loader/index.js (so not eslint).
• Then in node_modules, you can find eslint-loader and check the version in its package.json. It's probably quite outdated. Mine was at 1.9.0, while the current version of eslint-loader is 4.0.2
• And back to the error - that path that it is complaining about apparently did get changed from eslint/lib/formatters/stylish to eslint/lib/formatters/<some-other-folder>/stylish in a newer version of eslint (I think v6). And now this older eslint-loader version is failing to find the updated path in eslint.

So either upgrading eslint-loader to a newer version that knows this new path (Easy fix 1), or downgrading eslint down to when it had that old path (Easy fix 2), should both work.

For the record I think this outdated dependency is coming from webpack, which makes it difficult to debug for the create-react-app folks.