Initial stylelint config

Author: ntwb

packages/stylelint-config-airbnb/.eslintrc

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+{
+  "extends": "airbnb-base"
+}

packages/stylelint-config-airbnb/.gitignore

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+node_modules
+npm-debug.log

packages/stylelint-config-airbnb/index.js

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+module.exports = {
+  plugins: [
+    'stylelint-scss',
+    'stylelint-value-border-zero',
+  ],
+  rules: {
+    'at-rule-empty-line-before': 'never',
+    'block-opening-brace-space-before': 'always',
+    'comment-empty-line-before': ['always', {
+      ignore: ['stylelint-commands'],
+    }],
+    'declaration-colon-space-after': 'always',
+    'declaration-colon-space-before': 'never',
+    indentation: 2,
+    'max-nesting-depth': 3,
+    'no-invalid-double-slash-comments': true,
+    'rule-non-nested-empty-line-before': ['always', {
+      ignore: ['after-comment'],
+    }],
+    'selector-list-comma-newline-after': 'always',
+    'selector-no-id': true,
+
+    'scss/dollar-variable-pattern': '^foo',
+    'scss/at-extend-no-missing-placeholder': true,
+
+    'value-border-zero': {
+      convention: '0',
+    },
+  },
+};

packages/stylelint-config-airbnb/package.json

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+{
+  "name": "stylelint-config-airbnb",
+  "version": "0.0.0",
+  "description": "Airbnb's stylelint config, following our styleguide",
+  "main": "index.js",
+  "scripts": {
+    "lint": "eslint .",
+    "test": "npm run lint"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/airbnb/css.git"
+  },
+  "keywords": [
+    "airbnb",
+    "css",
+    "lint",
+    "stylelint",
+    "stylelint-config",
+    "stylelint-config-airbnb"
+  ],
+  "author": "Stephen Edgar",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/airbnb/css/issues"
+  },
+  "homepage": "https://github.com/airbnb/css#readme",
+  "devDependencies": {
+    "eslint": "^3.0.1",
+    "eslint-config-airbnb-base": "^4.0.0",
+    "eslint-plugin-import": "^1.10.2",
+    "stylelint": "^6.9.0",
+    "stylelint-scss": "^1.2.1",
+    "stylelint-value-border-zero": "^1.0.2"
+  },
+  "peerDependencies": {
+    "stylelint": "^6.9.0",
+    "stylelint-scss": "^1.2.1"
+  }
+}

packages/stylelint-config-airbnb/test/bad.css

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+.avatar{
+    border-radius:50%;
+    border:2px solid white; }
+.no, .nope, .not_good {
+  border: none;
+}
+#lol-no {
+  border: none;
+}
+
+.foo {
+  border: none;
+}
+
+.page-container {
+  .content {
+    .profile {
+      .toodeep{
+
+      }
+    }
+  }
+}

packages/stylelint-config-airbnb/test/good.css

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+.avatar {
+  border-radius: 50%;
+  border: 2px solid white;
+}
+
+.one,
+.selector,
+.per-line {
+  border: 2px;
+}
+
+.foo {
+  border: 0;
+}
+
+.btn {
+  background: green;
+  font-weight: bold;
+  @include transition(background 0.5s ease);
+
+  .icon {
+    margin-right: 10px;
+  }
+}
+
+.page-container {
+  .content {
+    .profile {
+    }
+  }
+}