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71 lines
1.2 KiB
71 lines
1.2 KiB
4 years ago
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# [postcss][postcss]-discard-duplicates
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> Discard duplicate rules in your CSS files with PostCSS.
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## Install
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With [npm](https://npmjs.org/package/postcss-discard-duplicates) do:
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```
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npm install postcss-discard-duplicates --save
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```
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## Example
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This module will remove all duplicate rules from your stylesheets. It works on
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at rules, normal rules and declarations. Note that this module does not have any
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responsibility for normalising declarations, selectors or whitespace, so that it
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considers these two rules to be different:
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```css
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h1, h2 {
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color: blue;
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}
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h2, h1 {
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color: blue;
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}
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```
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It has to assume that your rules have already been transformed by another
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processor, otherwise it would be responsible for too many things.
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### Input
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```css
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h1 {
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margin: 0 auto;
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margin: 0 auto
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}
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h1 {
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margin: 0 auto
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}
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```
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### Output
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```css
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h1 {
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margin: 0 auto
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}
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```
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## Usage
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See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
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examples for your environment.
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## Contributors
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See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
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## License
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MIT © [Ben Briggs](http://beneb.info)
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[postcss]: https://github.com/postcss/postcss
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