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GeezerVison is showing github.com — Fix `Config['extends']` type for configuration objects by firefoxic · Pull Request #9526 · stylelint/stylelint

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firefoxic commented Sep 23, 2026

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Which issue, if any, is this issue related to?

Closes #9525.

Is there anything in the PR that needs further explanation?

The runtime already accepts a configuration object in extends (#6998); only the type, the type test and the docs are changed.

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          Fix Config type to accept configuration objects in extends

3247df6

Stylelint has accepted a configuration object as an item of `extends`
since stylelint#6998, but the `ConfigExtends` type stayed `string | string[]`,
so a JavaScript configuration typed with `Config` could not extend an
object without a cast, and the docs listed only "locaters". The type
now admits `Config` objects beside strings, the type test extends one,
and the `extends` section shows the object form.

changeset-bot Bot commented Sep 23, 2026 •

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🦋 Changeset detected

Latest commit: dde2c14

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

This PR includes changesets to release 1 package

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          Merge branch 'v18' into type-extends-config-objects

jeddy3 requested changes

Sep 30, 2026

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Thanks for the PR.

I've requested some minor doc changes to keep things consistent and concise.

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docs/user-guide/configure.md Resolved

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.changeset/extends-config-objects.md Resolved

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jeddy3 changed the title ~~Fix Config type to accept configuration objects in extends~~ Fix Config['extends'] type for configuration objects

Sep 30, 2026

firefoxic and others added 4 commits

September 30, 2026 14:52


          Update docs/user-guide/configure.md

Co-authored-by: Richard Hallows <[email protected]>


          Update docs/user-guide/configure.md

c171fe0

Co-authored-by: Richard Hallows <[email protected]>


          Update .changeset/extends-config-objects.md

95727a2

Co-authored-by: Richard Hallows <[email protected]>


          Merge branch 'v18' into type-extends-config-objects

93e8ad2

ybiquitous linked an issue

Oct 8, 2026

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Fix Config type to accept configuration objects in extends #9525

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Oct 8, 2026

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Thanks, almost LGTM. Can you resolve conflicts?

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          Merge branch 'v18' into type-extends-config-objects

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firefoxic commented

Oct 8, 2026

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          Revert unnecessary changes

dde2c14

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Thanks, LGTM 👍

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LGTM, too. Thank you.

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jeddy3 merged commit d8a3024 into stylelint:v18

Oct 8, 2026

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firefoxic deleted the type-extends-config-objects branch

October 8, 2026 10:29

renovate Bot added a commit to andrei-picus-tink/auto-renovate that referenced this pull request

Nov 7, 2026


          Update dependency stylelint to v18

69ca317

| datasource | package   | from    | to     |
| ---------- | --------- | ------- | ------ |
| npm        | stylelint | 17.16.0 | 18.0.0 |


## [v18.0.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1800---2026-11-03)

It contains 13 breaking changes, which we've detailed in the [migrating to `18.0.0` guide](docs/migration-guide/to-18.md). It also adds 4 new rules and fixes 16 bugs.

- Removed: support for end-of-life and older versions of Node.js ([#9486](stylelint/stylelint#9486)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: support for CommonJS-style filename-less and extension-less locator paths ([#9545](stylelint/stylelint#9545)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: resolution of packages from the global `node_modules` directory ([#9534](stylelint/stylelint#9534)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `context.fix` property ([#9505](stylelint/stylelint#9505)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `declaration-block-single-line-max-declarations` rule ([#9565](stylelint/stylelint#9565)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `*syntax` options from `declaration-property-value-no-unknown` ([#9487](stylelint/stylelint#9487)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `ignoreSelectors` option from `selector-max-specificity` ([#9579](stylelint/stylelint#9579)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: TypeScript config files to be loaded by Node.js's built-in type stripping ([#9489](stylelint/stylelint#9489)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: the CLI to parse arguments with `node:util.parseArgs` ([#9508](stylelint/stylelint#9508)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: `globbyOptions` to support only a subset of options ([#9500](stylelint/stylelint#9500)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: `function-no-unknown` to use the CSSTree Syntax Reference for known functions and to ignore vendor-prefixed functions ([#9574](stylelint/stylelint#9574)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: color detection to use new `color` option with `node:util.styleText` ([#9529](stylelint/stylelint#9529)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: hyperlink detection ([#9536](stylelint/stylelint#9536)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `at-charset-rule-no-invalid` rule ([#9509](stylelint/stylelint#9509)) ([@firefoxic](https://github.com/firefoxic)).
- Added: `declaration-property-custom-property-allowed-list` rule ([#9542](stylelint/stylelint#9542)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `value-no-invalid` rule ([#9507](stylelint/stylelint#9507)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `value-type-custom-property-required-list` experimental rule ([#9572](stylelint/stylelint#9572)) ([@jeddy3](https://github.com/jeddy3)).
- Added: stable support for `processors` configuration property ([#9543](stylelint/stylelint#9543)) ([@jeddy3](https://github.com/jeddy3)).
- Added: stable support for `referenceFiles` configuration property ([#9598](stylelint/stylelint#9598)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `result.stylelint.postcss` property for plugins ([#9594](stylelint/stylelint#9594)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `stylelint.version` property ([#9595](stylelint/stylelint#9595)) ([@ybiquitous](https://github.com/ybiquitous)).
- Added: `languageOptions.syntax` support to `function-no-unknown` ([#9574](stylelint/stylelint#9574)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `referenceFiles` performance ([#9573](stylelint/stylelint#9573)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: import and cache performance by replacing `file-entry-cache` ([#9593](stylelint/stylelint#9593)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: import performance by lazily loading `css-tree` ([#9580](stylelint/stylelint#9580)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: exit code when all errors in a file are suppressed and other problems are reported ([#9528](stylelint/stylelint#9528)) ([@schreibse](https://github.com/schreibse)).
- Fixed: `--fix` for files where the only change is the removal of a byte order mark ([#9512](stylelint/stylelint#9512)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `Config['extends']` type for configuration objects ([#9526](stylelint/stylelint#9526)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `at-rule-descriptor-value-no-unknown` false negatives for `var()` ([#9614](stylelint/stylelint#9614)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `custom-property-{pattern,no-missing-var-function}` and `*-no-unknown` false positives and negatives for `@property` with a list of names ([#9571](stylelint/stylelint#9571)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `custom-property-no-missing-var-function` false negatives for custom properties defined in `referenceFiles` ([#9570](stylelint/stylelint#9570)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `custom-property-no-missing-var-function` false positives for recently introduced properties ([#9567](stylelint/stylelint#9567)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `declaration-block-no-redundant-longhand-properties` and `declaration-block-no-shorthand-property-overrides` false negatives for `contain-intrinsic-size` ([#9550](stylelint/stylelint#9550)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `declaration-block-no-shorthand-property-overrides` false negatives for flow-relative properties overridden by physical shorthands ([#9549](stylelint/stylelint#9549)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `declaration-property-value-no-unknown` false negatives for values containing known custom properties ([#9537](stylelint/stylelint#9537)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `declaration-property-value-no-unknown` false negatives for values containing registered custom properties ([#9566](stylelint/stylelint#9566)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `declaration-property-value-no-unknown` false positives and negatives for files included in a `referenceFiles` bundle ([#9358](stylelint/stylelint#9358)) ([@romainmenke](https://github.com/romainmenke)).
- Fixed: `property-layout-mappings` false negatives for physical shorthand properties ([#9615](stylelint/stylelint#9615)) ([@jeddy3](https://github.com/jeddy3)).

renovate Bot added a commit to andrei-picus-tink/auto-renovate that referenced this pull request

Nov 8, 2026


          Update dependency stylelint to v18

8fbeb36

| datasource | package   | from    | to     |
| ---------- | --------- | ------- | ------ |
| npm        | stylelint | 17.16.0 | 18.0.0 |


## [v18.0.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1800---2026-11-03)

It contains 13 breaking changes, which we've detailed in the [migrating to `18.0.0` guide](docs/migration-guide/to-18.md). It also adds 4 new rules and fixes 16 bugs.

- Removed: support for end-of-life and older versions of Node.js ([#9486](stylelint/stylelint#9486)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: support for CommonJS-style filename-less and extension-less locator paths ([#9545](stylelint/stylelint#9545)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: resolution of packages from the global `node_modules` directory ([#9534](stylelint/stylelint#9534)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `context.fix` property ([#9505](stylelint/stylelint#9505)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `declaration-block-single-line-max-declarations` rule ([#9565](stylelint/stylelint#9565)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `*syntax` options from `declaration-property-value-no-unknown` ([#9487](stylelint/stylelint#9487)) ([@jeddy3](https://github.com/jeddy3)).
- Removed: `ignoreSelectors` option from `selector-max-specificity` ([#9579](stylelint/stylelint#9579)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: TypeScript config files to be loaded by Node.js's built-in type stripping ([#9489](stylelint/stylelint#9489)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: the CLI to parse arguments with `node:util.parseArgs` ([#9508](stylelint/stylelint#9508)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: `globbyOptions` to support only a subset of options ([#9500](stylelint/stylelint#9500)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: `function-no-unknown` to use the CSSTree Syntax Reference for known functions and to ignore vendor-prefixed functions ([#9574](stylelint/stylelint#9574)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: color detection to use new `color` option with `node:util.styleText` ([#9529](stylelint/stylelint#9529)) ([@jeddy3](https://github.com/jeddy3)).
- Changed: hyperlink detection ([#9536](stylelint/stylelint#9536)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `at-charset-rule-no-invalid` rule ([#9509](stylelint/stylelint#9509)) ([@firefoxic](https://github.com/firefoxic)).
- Added: `declaration-property-custom-property-allowed-list` rule ([#9542](stylelint/stylelint#9542)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `value-no-invalid` rule ([#9507](stylelint/stylelint#9507)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `value-type-custom-property-required-list` experimental rule ([#9572](stylelint/stylelint#9572)) ([@jeddy3](https://github.com/jeddy3)).
- Added: stable support for `processors` configuration property ([#9543](stylelint/stylelint#9543)) ([@jeddy3](https://github.com/jeddy3)).
- Added: stable support for `referenceFiles` configuration property ([#9598](stylelint/stylelint#9598)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `result.stylelint.postcss` property for plugins ([#9594](stylelint/stylelint#9594)) ([@jeddy3](https://github.com/jeddy3)).
- Added: `stylelint.version` property ([#9595](stylelint/stylelint#9595)) ([@ybiquitous](https://github.com/ybiquitous)).
- Added: `languageOptions.syntax` support to `function-no-unknown` ([#9574](stylelint/stylelint#9574)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `referenceFiles` performance ([#9573](stylelint/stylelint#9573)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: import and cache performance by replacing `file-entry-cache` ([#9593](stylelint/stylelint#9593)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: import performance by lazily loading `css-tree` ([#9580](stylelint/stylelint#9580)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: exit code when all errors in a file are suppressed and other problems are reported ([#9528](stylelint/stylelint#9528)) ([@schreibse](https://github.com/schreibse)).
- Fixed: `--fix` for files where the only change is the removal of a byte order mark ([#9512](stylelint/stylelint#9512)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `Config['extends']` type for configuration objects ([#9526](stylelint/stylelint#9526)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `at-rule-descriptor-value-no-unknown` false negatives for `var()` ([#9614](stylelint/stylelint#9614)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `custom-property-{pattern,no-missing-var-function}` and `*-no-unknown` false positives and negatives for `@property` with a list of names ([#9571](stylelint/stylelint#9571)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `custom-property-no-missing-var-function` false negatives for custom properties defined in `referenceFiles` ([#9570](stylelint/stylelint#9570)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `custom-property-no-missing-var-function` false positives for recently introduced properties ([#9567](stylelint/stylelint#9567)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `declaration-block-no-redundant-longhand-properties` and `declaration-block-no-shorthand-property-overrides` false negatives for `contain-intrinsic-size` ([#9550](stylelint/stylelint#9550)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `declaration-block-no-shorthand-property-overrides` false negatives for flow-relative properties overridden by physical shorthands ([#9549](stylelint/stylelint#9549)) ([@firefoxic](https://github.com/firefoxic)).
- Fixed: `declaration-property-value-no-unknown` false negatives for values containing known custom properties ([#9537](stylelint/stylelint#9537)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `declaration-property-value-no-unknown` false negatives for values containing registered custom properties ([#9566](stylelint/stylelint#9566)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `declaration-property-value-no-unknown` false positives and negatives for files included in a `referenceFiles` bundle ([#9358](stylelint/stylelint#9358)) ([@romainmenke](https://github.com/romainmenke)).
- Fixed: `property-layout-mappings` false negatives for physical shorthand properties ([#9615](stylelint/stylelint#9615)) ([@jeddy3](https://github.com/jeddy3)).

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firefoxic commented Sep 23, 2026

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changeset-bot Bot commented Sep 23, 2026 •

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