feat: change type from deprecated `FlatConfig` to `Config`

[irsooti]

Hello,

the type FlatConfig has been replaced with Config, according to the deprecation warning.

I just changed the type with the suggested one.

Cheers!

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 42abb5d36861690f4bce6ba2769f77ee435cd79d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
eslint-plugin-prettier	Minor

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[MartinX3]

@irsooti I tried your change but maybe it's because I use the eslint.config.ts since ESLint 9.9.0.

eslint.config.ts:29:3 - error TS2345: Argument of type 'Config<RulesRecord>' is not assignable to parameter of type 'ConfigWithExtends'.
  Types of property 'languageOptions' are incompatible.
    Type 'import("path/node_modules/.pnpm/@[email protected]/node_modules/@types/eslint/index").Linter.LanguageOptions | undefined' is not assignable to type 'import("path/node_modules/.pnpm/@[email protected][email protected][email protected][email protected]/node_modules/@typescript-eslint/utils/dist/ts-eslint/Config").FlatConfig.LanguageOptions | undefined'.
      Type 'import("path/node_modules/.pnpm/@[email protected]/node_modules/@types/eslint/index").Linter.LanguageOptions' is not assignable to type 'import("path/node_modules/.pnpm/@[email protected][email protected][email protected][email protected]/node_modules/@typescript-eslint/utils/dist/ts-eslint/Config").FlatConfig.LanguageOptions'.
        Types of property 'globals' are incompatible.
          Type 'Globals | undefined' is not assignable to type 'GlobalsConfig | undefined'.
            Type 'Globals' is not assignable to type 'GlobalsConfig'.
              'string' index signatures are incompatible.
                Type 'GlobalConf' is not assignable to type 'GlobalVariableOption'.
                  Type '"readable"' is not assignable to type 'GlobalVariableOption'.

Edit: It seems to work using Readonly<Linter.RulesRecord> instead of Linter.Config like used here https://github.com/DefinitelyTyped/DefinitelyTyped/blob/136deed9a5c0adaea7bc7674783bb52608673d05/types/eslint__js/index.d.ts#L5

[JounQin]

It seems to work using Readonly<Linter.RulesRecord> instead of Linter.Config like used here

That's not same thing, RulesRecord only include rules, but recommended.js is different.

https://github.com/prettier/eslint-plugin-prettier/blob/aa5b59f7d98431bdb9559d079619065f812a2420/recommended.js#L5-L17

[JounQin]

This would be a breaking change for eslint v8 users.

[MartinX3]

It's working for me without my workaround since some time.

[coderabbitai[bot]]

Walkthrough

A new changeset file was added to document a minor update to the eslint-plugin-prettier package. The update introduces a conditional type alias, IfEqual, within the type declarations. This alias is used to determine if Linter.Config and Linter.FlatConfig are equivalent, and accordingly sets the type of recommendedConfig to prefer Config when both types are equal. No changes were made to the declarations of exported or public entities beyond the type alias and the updated type for recommendedConfig.

Changes

File(s)	Change Summary
.changeset/lucky-badgers-judge.md	Added a changeset documenting a minor update to the eslint-plugin-prettier package regarding type preference.
recommended.d.ts	Introduced IfEqual type alias; updated recommendedConfig type to use conditional type logic for type equality.

Sequence Diagram(s)

sequenceDiagram
    participant Developer
    participant TypeSystem

    Developer->>TypeSystem: Reference recommendedConfig
    TypeSystem->>TypeSystem: Evaluate IfEqual<Linter.Config, Linter.FlatConfig, Linter.Config, Linter.FlatConfig>
    alt Types are equal
        TypeSystem-->>Developer: recommendedConfig is Linter.Config
    else Types are not equal
        TypeSystem-->>Developer: recommendedConfig is Linter.FlatConfig
    end

Poem

A hop and a skip, a type check anew,
Where Configs and FlatConfigs meet in review.
If equal, we cheer, and Config takes the lead,
If not, FlatConfig fulfills every need.
With changesets noted and types all aligned,
This rabbit approves—what a clever design!
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 9e37575b2852226077b21975ea96315bb794d2b1 and 42abb5d36861690f4bce6ba2769f77ee435cd79d.

📒 Files selected for processing (2)

• .changeset/lucky-badgers-judge.md (1 hunks)
• recommended.d.ts (1 hunks)

🔇 Additional comments (2)

recommended.d.ts (1)

10-10: The type condition appropriately handles ESLint version compatibility.

This change implements the preference for Config over FlatConfig when they're equal, aligning with ESLint's deprecation notice while maintaining backward compatibility with both ESLint v8 and v9.

.changeset/lucky-badgers-judge.md (1)

1-5: Appropriate changeset documentation for a minor version change.

The changeset correctly documents this as a minor version change with a clear description that matches the implementation. This ensures users are properly informed about the change in the release notes.

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• [ ] 📝 Generate Docstrings

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[JounQin]

@coderabbitai full review

[coderabbitai[bot]]

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