[Stylelint] Create shareable package for lucca-front.

packages/stylelint-config/README.md

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+# lucca-front / Stylelint config
+
+This package is a shareable stylelint configuration.
+
+[Stylelint](https://stylelint.io/) checks for common mistakes in CSS and CSS-like files, and allows to define rules for tools and developers.
+
+[Prettier should be used](https://stylelint.io/#how-itll-help-you) to handle coding style-guides when possible.
+
+## Install
+
+```
+npm uninstall stylelint && npm i --save-dev @lucca/stylelint-config
+```
+
+## Avoid conflicts
+
+Remove any pre-existing [configuration](https://stylelint.io/user-guide/configure) (file or statements in package.json).
+
+## Configure
+
+### For your local project
+
+Use this package in a _stylelint.config.js_ file in your repository:
+
+```js
+module.exports = {
+	extends: ['@lucca/stylelint-config'],
+	rules: {},
+};
+```
+
+### For your CI
+
+Add the relevant scripts to lint the code in Jenkins. Something like:
+
+```json
+"lint": "ng lint && npm run stylelint",
+"stylelint": "stylelint \"./projects/**/*.scss\"",
+```
+
+### Breaking the rules
+
+#### Overrides
+
+You can [apply specific rules with overrides](https://stylelint.io/user-guide/configure/#overrides) as needed.
+
+Rules can be disabled while incrementally fixing your code. Set them to `null`:
+
+```js
+module.exports = {
+	extends: ['@lucca-front/stylelint-config'],
+	overrides: [
+		{
+			files: ['some-path/**/*.scss'],
+			rules: {
+				'no-descending-specificity': null,
+			}
+		},
+	],
+	rules: {};
+};
+```
+
+#### Ignoring code inline
+
+If needed, each rule can be ignored with [stylelint-(dis|en)able](https://stylelint.io/user-guide/ignore-code).
+
+Please add a comment if you're doing so: use `styleling-disable[-*] -- comment`.
+
+## Testing locally
+
+In your stylelint configuration, temporarily replace `extends: ['@lucca/stylelint-config'],` by `extends: ['RELATIVE_PATH_TO/stylelint-config'],`.
+
+The configuration from your local repository should be applied right away.
+
+## Configuring your editor
+
+### VS Code
+
+⚠️ A [VSCode extension bug](https://github.com/stylelint/vscode-stylelint/issues/490#issuecomment-1966934533) issue might prevent you from using stylelint 16+.
+
+Follow instructions on the [extension page](https://marketplace.visualstudio.com/items?itemName=stylelint.vscode-stylelint).
+
+Those settings in _.vscode/settings.json_ should be fine:
+
+```json
+  "[scss]": {
+    "editor.formatOnSave": true,
+    "editor.defaultFormatter": "stylelint.vscode-stylelint",
+    "editor.codeActionsOnSave": {
+      "source.fixAll.stylelint": "explicit"
+    }
+  },
+  "stylelint.reportInvalidScopeDisables": true,
+  "stylelint.reportNeedlessDisables": true,
+  "stylelint.snippet": ["css", "scss"],
+  "stylelint.validate": ["css", "scss"]
+```
+
+Please note **the VSCode extension does not take overrides into account**.
+
+### JetStorm
+
+You might need to rename _stylelint.config.js_ to _stylelint.config.cjs_ (_CommonJS_) and [adapt the code in consequence](https://stylelint.io/user-guide/configure).

packages/stylelint-config/package.json

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+{
+  "name": "@lucca/stylelint-config",
+  "version": "0.0.0",
+  "description": "Lucca Front stylelint configuration",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/LuccaSA/lucca-front.git"
+  },
+  "main": "stylelint.config.cjs",
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    "stylelint",
+    "stylelint-config",
+    "lucca",
+		"scss",
+		"css"
+  ],
+  "public": true,
+  "author": "The product design team <[email protected]>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/LuccaSA/lucca-front/issues"
+  },
+  "homepage": "https://github.com/LuccaSA/lucca-front#readme",
+  "peerDependencies": {
+    "stylelint": "^15.11.0",
+    "stylelint-config-prettier-scss": "^1.0.0",
+    "stylelint-config-standard-scss": "^11.1.0"
+  }
+}

packages/stylelint-config/stylelint.config.mjs

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+'use strict';
+
+/** @type {import('stylelint').Config} */
+export default {
+	extends: ['stylelint-config-standard-scss', 'stylelint-config-prettier-scss'],
+
+	rules: {
+		// SCSS specific
+		// ============================================================================================
+		'scss/at-mixin-pattern': [
+			'^([a-z][a-zA-Z0-9]*)((-(([a-z0-9]+[a-zA-Z0-9]*)|([A-Z]+))+)*)$',
+			{
+				message: (mixinName) => `Expected "${mixinName}" to match pattern --foo(-bar(Baz)*)*`,
+			},
+		],
+		'scss/comment-no-empty': null,
+
+		// Generic rules
+		// ============================================================================================
+		'alpha-value-notation': [
+			'number',
+			{
+				severity: 'warning',
+			},
+		],
+		'at-rule-empty-line-before': [
+			'always',
+			{
+				except: ['blockless-after-blockless', 'first-nested'],
+				ignore: ['after-comment'],
+			},
+		],
+		'color-hex-length': null,
+		'custom-property-empty-line-before': [
+			'always',
+			{
+				severity: 'warning',
+				except: ['after-comment', 'after-custom-property', 'first-nested'],
+			},
+		],
+		'custom-property-no-missing-var-function': true,
+		'custom-property-pattern': [
+			'^([a-z][a-zA-Z0-9]*)((-(([a-z0-9]+[a-zA-Z0-9]*)|([A-Z]+))+)*)$',
+			{
+				message: (customProperty) => `Expected "${customProperty}" to match pattern --foo(-bar(Baz)*)*`,
+			},
+		],
+		'declaration-block-no-redundant-longhand-properties': null,
+		'declaration-empty-line-before': [
+			'always',
+			{
+				severity: 'warning',
+				except: ['after-comment', 'after-declaration', 'first-nested'],
+			},
+		],
+		'number-max-precision': 3,
+		'property-no-unknown': [
+			true,
+			{
+				ignoreProperties: ['scrollbar-3dlight-color'],
+			},
+		],
+		'selector-class-pattern': [
+			'^([a-z][a-zA-Z0-9]*)((-(([a-z0-9]+[a-zA-Z0-9]*)|([A-Z]+))+)*)$',
+			{
+				message: (selectorClass) => `Expected "${selectorClass}" to match pattern --foo(-bar(Baz)*)*`,
+			},
+		],
+		'selector-pseudo-element-no-unknown': [
+			true,
+			{
+				ignorePseudoElements: ['ng-deep'],
+			},
+		],
+		'value-keyword-case': [
+			'lower',
+			{
+				severity: 'warning',
+			},
+		],
+	},
+};