Configuration for rule "import/no-duplicates" is invalid: Value {"prefer-inline":true} should NOT have additional properties

[filipjakov]

problem in both: "eslint-plugin-import": "2.27.5" & "eslint-plugin-import": "2.28.1" versions

Trying to add support for typescript's new flag verbatimModuleSyntax

Since the codebase is big, the idea is to add warning rules for imports and as soon as the developer touches a file, it will --fix its content based on the following rules:

'@typescript-eslint/consistent-type-exports': 'warn',
'@typescript-eslint/consistent-type-imports': 'warn',
'@typescript-eslint/no-import-type-side-effects': 'warn',
'import/no-duplicates': ['error', { 'prefer-inline': true }],

(The above rules are recommended in https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/consistent-type-imports.md)

The first 3 work as expected, but import/no-duplicates yields:

Configuration for rule "import/no-duplicates" is invalid:
Value {"prefer-inline":true} should NOT have additional properties.

Since prefer-inline is recommended as per this, what am I doing wrong?

[ljharb]

Are you absolutely certain you have v2.28 of the import plugin? what does npm explain eslint-plugin-import output?

[filipjakov]

I was relying on the import provided by eslint-config-next@"13.3.0" which was [email protected] 😅

It seems like they have it as "eslint-plugin-import": "^2.26.0", in their package.json even on LTS.

Thanks, sorry for the trouble 🙏

[ljharb]

^2.26.0 is a semver range that includes the latest v2 version, so that should be just fine, and you just need to update your lockfile.