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Copyright (c) Ben Briggs <beneb.info@gmail.com> (http://beneb.info)
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

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# [postcss][postcss]-unique-selectors
> Ensure CSS selectors are unique.
## Install
With [npm](https://npmjs.org/package/postcss-unique-selectors) do:
```
npm install postcss-unique-selectors --save
```
## Example
Selectors are sorted naturally, and deduplicated:
### Input
```css
h1,h3,h2,h1 {
color: red
}
```
### Output
```css
h1,h2,h3 {
color: red
}
```
## Usage
See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
examples for your environment.
## Contributors
See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
## License
MIT © [Ben Briggs](http://beneb.info)
[postcss]: https://github.com/postcss/postcss

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{
"name": "postcss-unique-selectors",
"version": "5.1.1",
"description": "Ensure CSS selectors are unique.",
"main": "src/index.js",
"types": "types/index.d.ts",
"files": [
"LICENSE-MIT",
"src",
"types"
],
"keywords": [
"css",
"postcss",
"postcss-plugin"
],
"license": "MIT",
"homepage": "https://github.com/cssnano/cssnano",
"author": {
"name": "Ben Briggs",
"email": "beneb.info@gmail.com",
"url": "http://beneb.info"
},
"repository": "cssnano/cssnano",
"dependencies": {
"postcss-selector-parser": "^6.0.5"
},
"bugs": {
"url": "https://github.com/cssnano/cssnano/issues"
},
"engines": {
"node": "^10 || ^12 || >=14.0"
},
"devDependencies": {
"postcss": "^8.2.15"
},
"peerDependencies": {
"postcss": "^8.2.15"
},
"readme": "# [postcss][postcss]-unique-selectors\n\n> Ensure CSS selectors are unique.\n\n## Install\n\nWith [npm](https://npmjs.org/package/postcss-unique-selectors) do:\n\n```\nnpm install postcss-unique-selectors --save\n```\n\n## Example\n\nSelectors are sorted naturally, and deduplicated:\n\n### Input\n\n```css\nh1,h3,h2,h1 {\n color: red\n}\n```\n\n### Output\n\n```css\nh1,h2,h3 {\n color: red\n}\n```\n\n## Usage\n\nSee the [PostCSS documentation](https://github.com/postcss/postcss#usage) for\nexamples for your environment.\n\n## Contributors\n\nSee [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).\n\n## License\n\nMIT © [Ben Briggs](http://beneb.info)\n\n[postcss]: https://github.com/postcss/postcss\n"
}

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'use strict';
const selectorParser = require('postcss-selector-parser');
/**
* @param {string} selectors
* @param {selectorParser.SyncProcessor<void>} callback
* @return {string}
*/
function parseSelectors(selectors, callback) {
return selectorParser(callback).processSync(selectors);
}
/**
* @param {import('postcss').Rule} rule
* @return {string}
*/
function unique(rule) {
const selector = [...new Set(rule.selectors)];
selector.sort();
return selector.join();
}
/**
* @type {import('postcss').PluginCreator<void>}
* @return {import('postcss').Plugin}
*/
function pluginCreator() {
return {
postcssPlugin: 'postcss-unique-selectors',
OnceExit(css) {
css.walkRules((nodes) => {
/** @type {string[]} */
let comments = [];
/** @type {selectorParser.SyncProcessor<void>} */
const removeAndSaveComments = (selNode) => {
selNode.walk((sel) => {
if (sel.type === 'comment') {
comments.push(sel.value);
sel.remove();
return;
} else {
return;
}
});
};
if (nodes.raws.selector && nodes.raws.selector.raw) {
parseSelectors(nodes.raws.selector.raw, removeAndSaveComments);
nodes.raws.selector.raw = unique(nodes);
}
nodes.selector = parseSelectors(nodes.selector, removeAndSaveComments);
nodes.selector = unique(nodes);
nodes.selectors = nodes.selectors.concat(comments);
});
},
};
}
pluginCreator.postcss = true;
module.exports = pluginCreator;

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export = pluginCreator;
/**
* @type {import('postcss').PluginCreator<void>}
* @return {import('postcss').Plugin}
*/
declare function pluginCreator(): import('postcss').Plugin;
declare namespace pluginCreator {
const postcss: true;
}