feat(plugin-stylelint):add plugin

e2e/plugin-stylelint-e2e/eslint.config.js

@@ -0,0 +1,12 @@
+import tseslint from 'typescript-eslint';
+import baseConfig from '../../eslint.config.js';
+
+export default tseslint.config(...baseConfig, {
+  files: ['**/*.ts'],
+  languageOptions: {
+    parserOptions: {
+      projectService: true,
+      tsconfigRootDir: import.meta.dirname,
+    },
+  },
+});

e2e/plugin-stylelint-e2e/mocks/fixtures/default-setup/.stylelintrc.json

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+{
+  "extends": ["stylelint-config-standard"],
+  "rules": {
+    "color-no-invalid-hex": true,
+    "declaration-colon-space-after": "always",
+    "declaration-colon-space-before": "never",
+    "indentation": 2,
+    "declaration-block-trailing-semicolon": "always",
+    "declaration-block-no-duplicate-properties": true,
+    "block-opening-brace-space-before": "always",
+    "string-quotes": "double",
+    "max-line-length": 80,
+    "no-eol-whitespace": true,
+    "block-no-empty": true,
+    "no-missing-end-of-source-newline": true,
+    "declaration-block-no-redundant-longhand-properties": true
+  }
+}

e2e/plugin-stylelint-e2e/mocks/fixtures/default-setup/code-pushup.config.ts

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+import stylelintPlugin from '@code-pushup/stylelint-plugin';
+import type { CoreConfig } from '@code-pushup/models';
+
+export default {
+  plugins: [
+    await stylelintPlugin({
+      stylelintrc: '.stylelintrc.json',
+      patterns: ['**/*.css'],
+    }),
+  ],
+} satisfies CoreConfig;

e2e/plugin-stylelint-e2e/mocks/fixtures/default-setup/components.css

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+/* Additional CSS file for testing multiple file patterns */
+
+.card {
+  border: 1px solid #ccc;
+  padding: 16px;
+  margin: 8px;
+}
+
+.card-header {
+  font-weight: bold;
+  margin-bottom: 8px;
+}
+
+.card-body {
+  line-height: 1.4;
+}
+
+/* Valid CSS with no issues */
+.well-formatted {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}

e2e/plugin-stylelint-e2e/mocks/fixtures/default-setup/nested/deep.css

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+/* CSS file in nested directory */
+
+.nested-component {
+  position: relative;
+  z-index: 10;
+}
+
+/* Issue: missing space after colon */
+.nested-issue {
+  color: blue;
+}

e2e/plugin-stylelint-e2e/mocks/fixtures/default-setup/styles.css

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+/* Mock CSS file with various stylelint issues for e2e testing */
+
+/* Missing space after colon */
+.header {
+  color: red;
+  background-color: #ffffff;
+}
+
+/* Inconsistent indentation */
+.navigation {
+  padding: 10px;
+  margin: 5px;
+}
+
+/* Wrong unit usage */
+.footer {
+  font-size: 14px;
+  line-height: 1.5;
+  margin: 0px; /* Should use 0 instead of 0px */
+}
+
+/* Duplicate properties */
+.sidebar {
+  width: 200px;
+  width: 250px;
+  height: 100%;
+}
+
+/* Invalid hex color */
+.content {
+  color: #fff;
+  background: #12345;
+}
+
+/* Unnecessary vendor prefixes */
+.button {
+  -webkit-border-radius: 5px;
+  -moz-border-radius: 5px;
+  border-radius: 5px;
+}
+
+/* Missing space before opening brace */
+.modal {
+  position: fixed;
+  top: 50%;
+}
+
+/* Trailing whitespace and empty rules */
+.empty {
+}
+
+/* Inconsistent quotes */
+.mixed-quotes {
+  font-family: 'Arial', 'Helvetica', sans-serif;
+}
+
+/* Long line that should be wrapped */
+.long-line {
+  background: linear-gradient(
+    to right,
+    #ff0000,
+    #00ff00,
+    #0000ff,
+    #ffff00,
+    #ff00ff,
+    #00ffff
+  );
+}
+
+/* Missing final newline */
+.last-rule {
+  display: block;
+}

e2e/plugin-stylelint-e2e/project.json

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+{
+  "name": "plugin-stylelint-e2e",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "e2e/plugin-stylelint-e2e/src",
+  "projectType": "application",
+  "targets": {
+    "lint": {},
+    "e2e": {
+      "executor": "@nx/vitest:test",
+      "options": {
+        "configFile": "{projectRoot}/vitest.e2e.config.ts"
+      }
+    }
+  },
+  "implicitDependencies": ["@code-pushup/plugin-stylelint"],
+  "tags": ["scope:plugin", "type:e2e"]
+}