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postcss-custom-properties-transformer [![Latest version](https://badgen.net/npm/v/postcss-custom-properties-transformer)](https://npm.im/postcss-custom-properties-transformer) [![Monthly downloads](https://badgen.net/npm/dm/postcss-custom-properties-transformer)](https://npm.im/postcss-custom-properties-transformer) [![Install size](https://packagephobia.now.sh/badge?p=postcss-custom-properties-transformer)](https://packagephobia.now.sh/result?p=postcss-custom-properties-transformer)\n\nPostCSS plugin to transform [CSS custom properties](https://developer.mozilla.org/en-US/docs/Web/CSS/--*)\n\n\u003csub\u003eIf you like this project, please star it \u0026 [follow me](https://github.com/privatenumber) to see what other cool projects I'm working on! ❤️\u003c/sub\u003e\n\n## 🙋‍♂️ Why?\n\nTransform CSS custom properties to...\n\n- **🔥 Scope to package** Namespace them to your library to prevent collision with other custom properties\n- **👌 Scope to file** Scope to a file to prevent collision with other files\n- **🐥 Minify** Shorten long custom properties via hashing\n- **🤬 Obfuscate** Mangle custom-property names to deter reverse-engineering\n\n## 🚀 Install\n```sh\nnpm i -D postcss postcss-custom-properties-transformer\n```\n\n## 🚦 Quick Setup\n\nAdd `postcss-custom-properties-transformer` to your PostCSS configuration (eg. `postcss.config.js`) and pass in a `transformer` function.\n\n\u003e ⚠️  This plugin doesn't validate custom properties as browsers seem to validate them differently. As per the spec, custom properties is [\"defined as any valid identifier that starts with two dashes\"](https://www.w3.org/TR/css-variables-1/#defining-variables). An \"identifier\" can contain [\"only the characters [a-zA-Z0-9] and ISO 10646 characters U+0080 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, two hyphens, or a hyphen followed by a digit\"](https://www.w3.org/TR/CSS22/syndata.html#value-def-identifier).\n\n```diff\nmodule.exports = {\n     plugins: [\n\n+        // Insert above plugins that read custom properties\n+        require('postcss-custom-properties-transformer')({\n+            transformer({ property }) {\n+                // Prefixing all custom properties with 'APP-'\n+                return 'APP-' + property;\n+            }\n+        }),\n\n         require('postcss-preset-env')()\n     ]\n};\n```\n\n## 👨🏻‍🏫 Examples\n\n### Namespace with package meta\nIf you have a CSS library, you can scope your custom properties to every release so that multiple versions of the library used in the same app doesn't yield any collisions.\n\n```js\nconst pkg = require('./package.json')\nrequire('postcss-custom-properties-transformer')({\n    transformer({ property }) {\n        return `${pkg.name}-${pkg.version}-${property}`;\n    }\n})\n```\n\n### Hash custom properties\nIf you want to hash your custom properties to shorten/obfuscate them, pass in a hashing algorithm of your choice.\n\nThis demo uses a 6-character truncated MD5 hash; MD5 and the SHA-family has [statistically good uniform distribution](https://stackoverflow.com/questions/8184941/uniform-distribution-of-truncated-md5) and can be truncated.\n\nHowever, note that the shorter the hash, the higher the collision rate. 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The `--` prefix is omitted\n    - `filepath` `\u003cString\u003e` - The path to the file where the custom property is being transformed\n    - `css` `\u003cString\u003e` - The entire CSS code of the file\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fprivatenumber%2Fpostcss-custom-properties-transformer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fprivatenumber%2Fpostcss-custom-properties-transformer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fprivatenumber%2Fpostcss-custom-properties-transformer/lists"}