Unable to launch my app using sudo yarn build I am getting this error:

package.json » eslint-config-react-app/jest#overrides[0]:
   Environment key "jest/globals" is unknown

What would be a solution for this error?

Unable to launch my app using sudo yarn build I am getting this error:

package.json » eslint-config-react-app/jest#overrides[0]:
   Environment key "jest/globals" is unknown

What would be a solution for this error?

• javascript
• reactjs
• build
• eslint
• yarnpkg

• What should come from npmjs.com/package/eslint-plugin-jest, but I'm without a minimal reproducible example it's hard to say why your specific setup doesn't work. – jonrsharpe Commented May 1, 2021 at 7:19
• 1 As a temporary solution you could remove "eslintConfig": { "extends": [ "react-app", "react-app/jest" ] }, from your package.json – Neri Barakat Commented May 8, 2021 at 0:41

5 Answers 5

Update Package.json(Remove "react-app/jest" from extends array

"eslintConfig": { "extends": [ "react-app" ] },

if you are using eslintconfig delete that or remove the react-app/jest from there extends array and keep only react-app Run npm install and check again It should work.

I had the same issue with npm.

Resolution took editing package.json

Find and remove the whole eslintConfig

"eslintConfig": {
  "extends": [
      "react-app",
      "react-app/jest"
  ]
},

also I had devDependencies that needed to be removed.

  "devDependencies": {
    "eslint": "7.30.0",
    "eslint-config-airbnb": "18.2.1",
    "eslint-config-prettier": "8.3.0",
    "eslint-plugin-import": "2.23.4",
    "eslint-plugin-jsx-a11y": "6.4.1",
    "eslint-plugin-prettier": "3.4.0",
    "eslint-plugin-react": "7.24.0",
    "eslint-plugin-react-hooks": "4.2.0",
    "prettier": "2.3.2"
  }

I ran "npm install". The error cleared. Then I added all of the above back into the package.json. I ran "npm install" again with no errors.

That didn't work for me. The reason the error came up is because I had the same value in my CSS file for a media query as in my inline styling.

I was trying to set the font-size to 18px in the media query for mobile development and it was the same value in my inline styling. When I changed the values so that they were not the same the error went away.

If you don't want to remove "react-app/jest" from "eslintConfig", try installing the following node module, it worked for me.

npm install eslint-plugin-jsx-a11y

Related question and answer: https://stackoverflow.com/a/76461213/7034385

This is due to error in node_modules Delete node_modules from file directory manually and try running this code in terminal of VSCode :

npm install