feat: initial implementation

Author: k-g-a

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitignore

@@ -1 +1,2 @@
 .idea
+node_modules

index.d.ts

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+// Original definitions (@types/postcss-nested) by Maxim Vorontsov <https://github.com/VorontsovMaxim>
+
+import { PluginCreator } from 'postcss';
+
+declare namespace nested {
+    interface Options {
+        /**
+         * By default, plugin will bubble only @media and @supports at-rules.
+         * You can add your custom at-rules to this list by this option.
+         */
+        bubble?: string[];
+
+        /**
+         * By default, plugin will unwrap only @font-face, @keyframes and @document at-rules.
+         * You can add your custom at-rules to this list by this option.
+         */
+        unwrap?: string[];
+
+        /**
+         * By default, plugin will strip out any empty selector generated by intermediate nesting
+         * levels. You can set this option to true to preserve them.
+         */
+        preserveEmpty?: boolean;
+    }
+
+    type Nested = PluginCreator<Options>;
+}
+
+declare const nested: nested.Nested;
+export = nested;

index.js

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+const postcssNested = require("postcss-nested");
+
+module.exports = (opts = {}) => {
+  const instance = postcssNested(opts);
+
+  return {
+    postcssPlugin: "postcss-nested-once",
+    Once(root, postcssAPI) {
+      root.walkRules((rule) => {
+        instance.Rule(rule, postcssAPI);
+      });
+    },
+  };
+};
+
+module.exports.postcss = true;

package.json

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+{
+  "name": "postcss-nested-once",
+  "version": "1.0.0",
+  "description": "Postcss plugin to unwrap nested rules (like how Sass does it), compatible with rollup-plugin-styles",
+  "keywords": [
+    "postcss",
+    "css",
+    "postcss-plugin",
+    "sass",
+    "nested"
+  ],
+  "main": "index.js",
+  "type": "commonjs",
+  "repository": "https://github.com/k-g-a/postcss-nested-once",
+  "author": "Gleb Kochergin <[email protected]>",
+  "license": "MIT",
+  "private": false,
+  "engines": {
+    "node": ">=10.0"
+  },
+  "dependencies": {
+    "postcss-nested": "^5.0.5"
+  },
+  "peerDependencies": {
+    "postcss": "^8.3.5"
+  },
+  "devDependencies": {
+    "postcss": "^8.3.5",
+    "prettier": "^2.3.2"
+  }
+}

yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+colorette@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.2.tgz#cbcc79d5e99caea2dbf10eb3a26fd8b3e6acfa94"
+  integrity sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==
+
+cssesc@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-3.0.0.tgz#37741919903b868565e1c09ea747445cd18983ee"
+  integrity sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg==
+
+nanoid@^3.1.23:
+  version "3.1.23"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.23.tgz#f744086ce7c2bc47ee0a8472574d5c78e4183a81"
+  integrity sha512-FiB0kzdP0FFVGDKlRLEQ1BgDzU87dy5NnzjeW9YZNt+/c3+q82EQDUwniSAUxp/F0gFNI1ZhKU1FqYsMuqZVnw==
+
+postcss-nested@^5.0.5:
+  version "5.0.5"
+  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-5.0.5.tgz#f0a107d33a9fab11d7637205f5321e27223e3603"
+  integrity sha512-GSRXYz5bccobpTzLQZXOnSOfKl6TwVr5CyAQJUPub4nuRJSOECK5AqurxVgmtxP48p0Kc/ndY/YyS1yqldX0Ew==
+  dependencies:
+    postcss-selector-parser "^6.0.4"
+
+postcss-selector-parser@^6.0.4:
+  version "6.0.6"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.6.tgz#2c5bba8174ac2f6981ab631a42ab0ee54af332ea"
+  integrity sha512-9LXrvaaX3+mcv5xkg5kFwqSzSH1JIObIx51PrndZwlmznwXRfxMddDvo9gve3gVR8ZTKgoFDdWkbRFmEhT4PMg==
+  dependencies:
+    cssesc "^3.0.0"
+    util-deprecate "^1.0.2"
+
+postcss@^8.3.5:
+  version "8.3.5"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.3.5.tgz#982216b113412bc20a86289e91eb994952a5b709"
+  integrity sha512-NxTuJocUhYGsMiMFHDUkmjSKT3EdH4/WbGF6GCi1NDGk+vbcUTun4fpbOqaPtD8IIsztA2ilZm2DhYCuyN58gA==
+  dependencies:
+    colorette "^1.2.2"
+    nanoid "^3.1.23"
+    source-map-js "^0.6.2"
+
+prettier@^2.3.2:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.2.tgz#ef280a05ec253712e486233db5c6f23441e7342d"
+  integrity sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==
+
+source-map-js@^0.6.2:
+  version "0.6.2"
+  resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-0.6.2.tgz#0bb5de631b41cfbda6cfba8bd05a80efdfd2385e"
+  integrity sha512-/3GptzWzu0+0MBQFrDKzw/DvvMTUORvgY6k6jd/VS6iCR4RDTKWH6v6WPwQoUO8667uQEf9Oe38DxAYWY5F/Ug==
+
+util-deprecate@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
+  integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=