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In my Next/React/Typescript/Jest project I'm trying to configure my eslint config. After updating to version 8.x (currently 8.0.1), the linter throws following error:

Error: .eslintrc.js » ./eslint/config.js:
    Environment key "jest/globals" is unknown

Then I added 'plugin:jest/remended' to the extends array in my config.js, which led me to this error:

TypeError: Failed to load plugin 'jest' declared in '.eslintrc.js » ./eslint/config.js': Class extends value undefined is not a constructor or null

The plugin is installed and inside my package.json. Even several npm ci haven't helped me here.

Would appreciate ideas !

In my Next/React/Typescript/Jest project I'm trying to configure my eslint config. After updating to version 8.x (currently 8.0.1), the linter throws following error:

Error: .eslintrc.js » ./eslint/config.js:
    Environment key "jest/globals" is unknown

Then I added 'plugin:jest/remended' to the extends array in my config.js, which led me to this error:

TypeError: Failed to load plugin 'jest' declared in '.eslintrc.js » ./eslint/config.js': Class extends value undefined is not a constructor or null

The plugin is installed and inside my package.json. Even several npm ci haven't helped me here.

Would appreciate ideas !

  • javascript
  • typescript
  • config
  • eslint
Share Improve this question asked Oct 18, 2021 at 7:47 dsudodsudo 1934 silver badges23 bronze badges
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1 Answer 1

Reset to default 9

Are you using any other eslint plugins? If so, has npm warned you of any peer dependency issues?

I ran into this same issue when upgrading to eslint v8.0.1. In may case, one plugin I listed an an earlier version of @typescript-eslint/eslint-plugin as a direct dependency (@typescript-eslint/eslint-plugin is also a peer dependency of eslint-plugin-jest). This earlier version of @typescript-eslint/eslint-plugin was not patible with eslint v8.0.1. So I opted to downgrade to v7.32.0

If you have control over the other plugins you use, you might upgrade their dependencies and publish a new release. Else, you'll probably have to downgrade eslint in your project.

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