Fix ConfigurationError regression for custom syntaxes - #9245

| datasource | package   | from   | to     |
| ---------- | --------- | ------ | ------ |
| npm        | stylelint | 17.4.0 | 17.9.1 |


## [v17.9.1](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1791---2026-04-27)

It fixes 4 bugs. We also documented the `messageArgs` each rule provides to the `message` configuration property.

- Fixed: `ConfigurationError` regression for custom syntaxes ([#9245](stylelint/stylelint#9245)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: MD5 hash algorithm to SHA256 for caching ([#9241](stylelint/stylelint#9241)) ([@rkdfx](https://github.com/rkdfx)).
- Fixed: `property-no-deprecated` autofix for `page-break-*: always` ([#9214](stylelint/stylelint#9214)) ([@rkdfx](https://github.com/rkdfx)).
- Fixed: `selector-no-deprecated` false positives for `::part()` ([#9227](stylelint/stylelint#9227)) ([@SaekiTominaga](https://github.com/SaekiTominaga)).


## [v17.9.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1790---2026-04-23)

It adds 3 new features. Adding the `referenceFiles` property to your configuration object makes the `no-unknown-animations`, `no-unknown-custom-media` and `no-unknown-custom-properties` rules more useful.

- Added: experimental `referenceFiles` to configuration object ([#9179](stylelint/stylelint#9179)) ([@jeddy3](https://github.com/jeddy3)).
- Added: experimental `abortSignal` option to Node.js API for cancellation support ([#9213](stylelint/stylelint#9213)) ([@adalinesimonian](https://github.com/adalinesimonian)).
- Added: `maxWarnings` to configuration object ([#9181](stylelint/stylelint#9181)) ([@mrginglymus](https://github.com/mrginglymus)).


## [v17.8.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1780---2026-04-15)

It adds 3 new rules and 1 configuration property.

- Added: `languageOptions.directionality` configuration property ([#8687](stylelint/stylelint#8687)) ([@sw1tch3roo](https://github.com/sw1tch3roo)).
- Added: `property-layout-mappings` rule ([#8687](stylelint/stylelint#8687)) ([@sw1tch3roo](https://github.com/sw1tch3roo)).
- Added: `relative-selector-nesting-notation` rule ([#8730](stylelint/stylelint#8730)) ([@sw1tch3roo](https://github.com/sw1tch3roo)).
- Added: `selector-no-deprecated` rule ([#8694](stylelint/stylelint#8694)) ([@immitsu](https://github.com/immitsu)).


## [v17.7.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1770---2026-04-12)

It fixes 4 bugs, including clearer problem messages by removing filler words and leading with the problem. We've also released `1.0.0` of [create-stylelint](https://github.com/stylelint/create-stylelint) to help with first-time Stylelint setup.

- Fixed: clarity of problem messages ([#9199](stylelint/stylelint#9199)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `--print-config` CLI flag to hide internal properties ([#9194](stylelint/stylelint#9194)) ([@ybiquitous](https://github.com/ybiquitous)).
- Fixed: `function-url-quotes` false positives when URLs have modifiers ([#8702](stylelint/stylelint#8702)) ([@immitsu](https://github.com/immitsu)).
- Fixed: `selector-no-qualifying-type` false positives for `:has()` ([#9182](stylelint/stylelint#9182)) ([@romainmenke](https://github.com/romainmenke)).


## [v17.6.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1760---2026-03-26)

It adds support for extending units in `languageOptions`, which then apply to rules like `declaration-property-value-no-unknown`, and fixes 2 bugs.

- Added: support for extending units to `languageOptions` ([#9166](stylelint/stylelint#9166)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: missing `ruleMetadata` when linting multiple files with overrides ([#9154](stylelint/stylelint#9154)) ([@kovsu](https://github.com/kovsu)).
- Fixed: `custom-property-no-missing-var-function` false positives for `timeline-scope` and `animation-timeline` ([#9164](stylelint/stylelint#9164)) ([@splincode](https://github.com/splincode)).


## [v17.5.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1750---2026-03-19)

It deprecates two rule options, adds 1 rule option and fixes 7 bugs. We've also released [`2.1.0`](https://github.com/stylelint/vscode-stylelint/releases/tag/2.1.0) of [our VS Code extension](https://marketplace.visualstudio.com/items?itemName=stylelint.vscode-stylelint), which adds 8 new requested features, and our [first release](https://www.npmjs.com/package/@stylelint/language-server) of the Stylelint Language Server.

- Deprecated: `*syntax` options from `declaration-property-value-no-unknown` ([#9102](stylelint/stylelint#9102)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Added: `ignoreMediaFeatureNameValues: {}` to `media-feature-name-value-no-unknown` ([#8976](stylelint/stylelint#8976)) ([@kovsu](https://github.com/kovsu)).
- Fixed: `node_modules` not ignored when using `codeFilename` in Node.js API ([#9130](stylelint/stylelint#9130)) ([@adalinesimonian](https://github.com/adalinesimonian)).
- Fixed: `Error TS7016` for imported `css-tree` types ([#9133](stylelint/stylelint#9133)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Fixed: `declaration-property-value-keyword-no-deprecated` false positives for function arguments ([#9116](stylelint/stylelint#9116)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Fixed: `declaration-property-value-no-unknown` false positives for `calc-size()` containing `size` keyword ([#9105](stylelint/stylelint#9105)) ([@hriztam](https://github.com/hriztam)).
- Fixed: `no-descending-specificity` & `no-duplicate-selectors` false negatives for equivalent compound selectors ([#8977](stylelint/stylelint#8977)) ([@kovsu](https://github.com/kovsu)).
- Fixed: `no-invalid-position-declaration` false positives for `@mixin` and `@scope` ([#9120](stylelint/stylelint#9120)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Fixed: `property-no-unknown` false negatives for `types` ([#9117](stylelint/stylelint#9117)) ([@Mouvedia](https://github.com/Mouvedia)).

| datasource | package   | from   | to     |
| ---------- | --------- | ------ | ------ |
| npm        | stylelint | 17.4.0 | 17.9.1 |


## [v17.9.1](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1791---2026-04-27)

It fixes 4 bugs. We also documented the `messageArgs` each rule provides to the `message` configuration property.

- Fixed: `ConfigurationError` regression for custom syntaxes ([#9245](stylelint/stylelint#9245)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: MD5 hash algorithm to SHA256 for caching ([#9241](stylelint/stylelint#9241)) ([@rkdfx](https://github.com/rkdfx)).
- Fixed: `property-no-deprecated` autofix for `page-break-*: always` ([#9214](stylelint/stylelint#9214)) ([@rkdfx](https://github.com/rkdfx)).
- Fixed: `selector-no-deprecated` false positives for `::part()` ([#9227](stylelint/stylelint#9227)) ([@SaekiTominaga](https://github.com/SaekiTominaga)).


## [v17.9.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1790---2026-04-23)

It adds 3 new features. Adding the `referenceFiles` property to your configuration object makes the `no-unknown-animations`, `no-unknown-custom-media` and `no-unknown-custom-properties` rules more useful.

- Added: experimental `referenceFiles` to configuration object ([#9179](stylelint/stylelint#9179)) ([@jeddy3](https://github.com/jeddy3)).
- Added: experimental `abortSignal` option to Node.js API for cancellation support ([#9213](stylelint/stylelint#9213)) ([@adalinesimonian](https://github.com/adalinesimonian)).
- Added: `maxWarnings` to configuration object ([#9181](stylelint/stylelint#9181)) ([@mrginglymus](https://github.com/mrginglymus)).


## [v17.8.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1780---2026-04-15)

It adds 3 new rules and 1 configuration property.

- Added: `languageOptions.directionality` configuration property ([#8687](stylelint/stylelint#8687)) ([@sw1tch3roo](https://github.com/sw1tch3roo)).
- Added: `property-layout-mappings` rule ([#8687](stylelint/stylelint#8687)) ([@sw1tch3roo](https://github.com/sw1tch3roo)).
- Added: `relative-selector-nesting-notation` rule ([#8730](stylelint/stylelint#8730)) ([@sw1tch3roo](https://github.com/sw1tch3roo)).
- Added: `selector-no-deprecated` rule ([#8694](stylelint/stylelint#8694)) ([@immitsu](https://github.com/immitsu)).


## [v17.7.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1770---2026-04-12)

It fixes 4 bugs, including clearer problem messages by removing filler words and leading with the problem. We've also released `1.0.0` of [create-stylelint](https://github.com/stylelint/create-stylelint) to help with first-time Stylelint setup.

- Fixed: clarity of problem messages ([#9199](stylelint/stylelint#9199)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: `--print-config` CLI flag to hide internal properties ([#9194](stylelint/stylelint#9194)) ([@ybiquitous](https://github.com/ybiquitous)).
- Fixed: `function-url-quotes` false positives when URLs have modifiers ([#8702](stylelint/stylelint#8702)) ([@immitsu](https://github.com/immitsu)).
- Fixed: `selector-no-qualifying-type` false positives for `:has()` ([#9182](stylelint/stylelint#9182)) ([@romainmenke](https://github.com/romainmenke)).


## [v17.6.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1760---2026-03-26)

It adds support for extending units in `languageOptions`, which then apply to rules like `declaration-property-value-no-unknown`, and fixes 2 bugs.

- Added: support for extending units to `languageOptions` ([#9166](stylelint/stylelint#9166)) ([@jeddy3](https://github.com/jeddy3)).
- Fixed: missing `ruleMetadata` when linting multiple files with overrides ([#9154](stylelint/stylelint#9154)) ([@kovsu](https://github.com/kovsu)).
- Fixed: `custom-property-no-missing-var-function` false positives for `timeline-scope` and `animation-timeline` ([#9164](stylelint/stylelint#9164)) ([@splincode](https://github.com/splincode)).


## [v17.5.0](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1750---2026-03-19)

It deprecates two rule options, adds 1 rule option and fixes 7 bugs. We've also released [`2.1.0`](https://github.com/stylelint/vscode-stylelint/releases/tag/2.1.0) of [our VS Code extension](https://marketplace.visualstudio.com/items?itemName=stylelint.vscode-stylelint), which adds 8 new requested features, and our [first release](https://www.npmjs.com/package/@stylelint/language-server) of the Stylelint Language Server.

- Deprecated: `*syntax` options from `declaration-property-value-no-unknown` ([#9102](stylelint/stylelint#9102)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Added: `ignoreMediaFeatureNameValues: {}` to `media-feature-name-value-no-unknown` ([#8976](stylelint/stylelint#8976)) ([@kovsu](https://github.com/kovsu)).
- Fixed: `node_modules` not ignored when using `codeFilename` in Node.js API ([#9130](stylelint/stylelint#9130)) ([@adalinesimonian](https://github.com/adalinesimonian)).
- Fixed: `Error TS7016` for imported `css-tree` types ([#9133](stylelint/stylelint#9133)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Fixed: `declaration-property-value-keyword-no-deprecated` false positives for function arguments ([#9116](stylelint/stylelint#9116)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Fixed: `declaration-property-value-no-unknown` false positives for `calc-size()` containing `size` keyword ([#9105](stylelint/stylelint#9105)) ([@hriztam](https://github.com/hriztam)).
- Fixed: `no-descending-specificity` & `no-duplicate-selectors` false negatives for equivalent compound selectors ([#8977](stylelint/stylelint#8977)) ([@kovsu](https://github.com/kovsu)).
- Fixed: `no-invalid-position-declaration` false positives for `@mixin` and `@scope` ([#9120](stylelint/stylelint#9120)) ([@ragini-pandey](https://github.com/ragini-pandey)).
- Fixed: `property-no-unknown` false negatives for `types` ([#9117](stylelint/stylelint#9117)) ([@Mouvedia](https://github.com/Mouvedia)).

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@tree-company/eslint-config](https://github.com/tree-company/developer-handbook) | devDependencies | minor | [`^0.5.0` -> `^0.6.0`](https://renovatebot.com/diffs/npm/@tree-company%2feslint-config/0.5.0/0.6.0) |
| [@tree-company/stylelint-config](https://github.com/tree-company/developer-handbook) | devDependencies | minor | [`^0.5.0` -> `^0.6.0`](https://renovatebot.com/diffs/npm/@tree-company%2fstylelint-config/0.5.0/0.6.0) |
| [stylelint](https://stylelint.io) ([source](https://github.com/stylelint/stylelint)) | devDependencies | minor | [`17.8.0` -> `17.12.0`](https://renovatebot.com/diffs/npm/stylelint/17.8.0/17.12.0) |

---

### Release Notes

<details>
<summary>stylelint/stylelint (stylelint)</summary>

### [`v17.12.0`](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#17120---2026-05-20)

[Compare Source](stylelint/stylelint@17.11.1...17.12.0)

It fixes 3 bugs, including a false negative one.

- Fixed: `block-no-empty` reported range when using comments ([#&#8203;9294](stylelint/stylelint#9294)) ([@&#8203;romainmenke](https://github.com/romainmenke)).
- Fixed: `declaration-property-value-no-unknown` false negatives for custom properties defined in reference files ([#&#8203;9292](stylelint/stylelint#9292)) ([@&#8203;romainmenke](https://github.com/romainmenke)).
- Fixed: `value-keyword-layout-mappings` false positives for `caption-side` ([#&#8203;9293](stylelint/stylelint#9293)) ([@&#8203;romainmenke](https://github.com/romainmenke)).

### [`v17.11.1`](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#17111---2026-05-14)

[Compare Source](stylelint/stylelint@17.11.0...17.11.1)

It fixes 2 bugs.

- Fixed: `node_modules` ignore for `codeFilename` paths containing a dot-prefixed directory ([#&#8203;9282](stylelint/stylelint#9282)) ([@&#8203;tuhtah](https://github.com/tuhtah)).
- Fixed: `declaration-block-no-redundant-longhand-properties` range for contiguous redundant longhand properties ([#&#8203;9273](stylelint/stylelint#9273)) ([@&#8203;pamelalozano16](https://github.com/pamelalozano16)).

### [`v17.11.0`](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#17110---2026-05-05)

[Compare Source](stylelint/stylelint@17.10.0...17.11.0)

It adds 2 features, including a `loader` property to `referenceFiles: {}` for when the order of appearance in the reference styles matters.

- Added: `loader` to experimental `referenceFiles: {}` ([#&#8203;9251](stylelint/stylelint#9251)) ([@&#8203;romainmenke](https://github.com/romainmenke)).
- Added: `autofixed` to the result object ([#&#8203;8771](stylelint/stylelint#8771)) ([@&#8203;Rob--W](https://github.com/Rob--W)).

### [`v17.10.0`](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#17100---2026-05-03)

[Compare Source](stylelint/stylelint@17.9.1...17.10.0)

It adds 3 rules and fixes 4 bugs. You can use the `*-layout-mappings` rules to enforce logical or physical properties, units and keywords.

- Added: `selector-no-invalid` rule ([#&#8203;9232](stylelint/stylelint#9232)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Added: `unit-layout-mappings` rule ([#&#8203;9229](stylelint/stylelint#9229)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Added: `value-keyword-layout-mappings` rule ([#&#8203;9233](stylelint/stylelint#9233)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Fixed: inconsistent error messages when module is not found ([#&#8203;9260](stylelint/stylelint#9260)) ([@&#8203;ybiquitous](https://github.com/ybiquitous)).
- Fixed: `property-layout-mappings` false negatives for property names in declaration values ([#&#8203;9222](stylelint/stylelint#9222)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Fixed: `property-layout-mappings` false positives for `@page` properties ([#&#8203;9223](stylelint/stylelint#9223)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Fixed: `selector-pseudo-class-no-unknown` false positives for nested `webkit-scrollbar` part ([#&#8203;9259](stylelint/stylelint#9259)) ([@&#8203;rkdfx](https://github.com/rkdfx)).

### [`v17.9.1`](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1791---2026-04-27)

[Compare Source](stylelint/stylelint@17.9.0...17.9.1)

It fixes 4 bugs. We also documented the `messageArgs` each rule provides to the `message` configuration property.

- Fixed: `ConfigurationError` regression for custom syntaxes ([#&#8203;9245](stylelint/stylelint#9245)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Fixed: MD5 hash algorithm to SHA256 for caching ([#&#8203;9241](stylelint/stylelint#9241)) ([@&#8203;rkdfx](https://github.com/rkdfx)).
- Fixed: `property-no-deprecated` autofix for `page-break-*: always` ([#&#8203;9214](stylelint/stylelint#9214)) ([@&#8203;rkdfx](https://github.com/rkdfx)).
- Fixed: `selector-no-deprecated` false positives for `::part()` ([#&#8203;9227](stylelint/stylelint#9227)) ([@&#8203;SaekiTominaga](https://github.com/SaekiTominaga)).

### [`v17.9.0`](https://github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#1790---2026-04-23)

[Compare Source](stylelint/stylelint@17.8.0...17.9.0)

It adds 3 new features. Adding the `referenceFiles` property to your configuration object makes the `no-unknown-animations`, `no-unknown-custom-media` and `no-unknown-custom-properties` rules more useful.

- Added: experimental `referenceFiles` to configuration object ([#&#8203;9179](stylelint/stylelint#9179)) ([@&#8203;jeddy3](https://github.com/jeddy3)).
- Added: experimental `abortSignal` option to Node.js API for cancellation support ([#&#8203;9213](stylelint/stylelint#9213)) ([@&#8203;adalinesimonian](https://github.com/adalinesimonian)).
- Added: `maxWarnings` to configuration object ([#&#8203;9181](stylelint/stylelint#9181)) ([@&#8203;mrginglymus](https://github.com/mrginglymus)).

</details>

---

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Reviewed-on: https://git.robbevp.be/robbevp/website-robbevanpetegem/pulls/510