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month](https://img.shields.io/npm/dm/react-native-typed-postcss-transformer.svg)](http://npmcharts.com/compare/react-native-typed-postcss-transformer?periodLength=30)\n[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github)\n\nUse [PostCSS](https://github.com/postcss/postcss) to transform CSS to [react native style objects](https://facebook.github.io/react-native/docs/style.html).\n\nThis transformer also generates `.d.ts` Typescript typings for the CSS files. Notice that platform specific extensions are not supported in the Typescript typings.\n\n\u003e This transformer can be used together with [React Native CSS modules](https://github.com/kristerkari/react-native-css-modules).\n\n_Minimum React Native version for this transformer is 0.52. If you are using an older version, please update to a newer React Native version before trying to use this transformer._\n\n## Usage\n\n### Step 1: Install\n\n```sh\nyarn add --dev react-native-typed-postcss-transformer postcss\n```\n\n### Step 2: Add your PostCSS config and install your PostCSS plugins\n\nAdd your PostCSS configuration to [one of the supported config formats](https://github.com/michael-ciniawsky/postcss-load-config), e.g. `package.json`, `.postcssrc`, `postcss.config.js`, etc.\n\n### Step 3: Configure the react native packager\n\n#### For React Native v0.57 or newer / Expo SDK v31.0.0 or newer\n\nAdd this to `metro.config.js` in your project's root (create the file if it does not exist already):\n\n```js\nconst { getDefaultConfig } = require(\"metro-config\");\n\nmodule.exports = (async () =\u003e {\n  const {\n    resolver: { sourceExts }\n  } = await getDefaultConfig();\n  return {\n    transformer: {\n      babelTransformerPath: require.resolve(\"./postcss-transformer.js\")\n    },\n    resolver: {\n      sourceExts: [...sourceExts, \"css\", \"pcss\"]\n    }\n  };\n})();\n```\n\nIf you are using [Expo](https://expo.io/), you also need to add this to `app.json`:\n\n```json\n{\n  \"expo\": {\n    \"packagerOpts\": {\n      \"config\": \"metro.config.js\",\n      \"sourceExts\": [\"ts\", \"tsx\", \"css\", \"pcss\"]\n    }\n  }\n}\n```\n\n---\n\n#### For React Native v0.56 or older\n\nIf you are using React Native without Expo, add this to `rn-cli.config.js` in your project's root (create the file if you don't have one already):\n\n```js\nmodule.exports = {\n  getTransformModulePath() {\n    return require.resolve(\"./postcss-transformer.js\");\n  },\n  getSourceExts() {\n    return [\"ts\", \"tsx\", \"css\", \"pcss\"]; // \u003c-- Add other extensions if needed.\n  }\n};\n```\n\n---\n\n#### For Expo SDK v30.0.0 or older\n\nIf you are using [Expo](https://expo.io/), instead of adding the `rn-cli.config.js` file, you need to add this to `app.json`:\n\n```json\n{\n  \"expo\": {\n    \"packagerOpts\": {\n      \"sourceExts\": [\"ts\", \"tsx\", \"css\", \"pcss\"],\n      \"transformer\": \"./postcss-transformer.js\"\n    }\n  }\n}\n```\n\n### Step 4: Add transformer file\n\nCreate `postcss-transformer.js` file to your project's root and specify supported extensions:\n\n```js\n// For React Native version 0.59 or later\nvar upstreamTransformer = require(\"metro-react-native-babel-transformer\");\n\n// For React Native version 0.56-0.58\n// var upstreamTransformer = require(\"metro/src/reactNativeTransformer\");\n\n// For React Native version 0.52-0.55\n// var upstreamTransformer = require(\"metro/src/transformer\");\n\n// For React Native version 0.47-0.51\n// var upstreamTransformer = require(\"metro-bundler/src/transformer\");\n\n// For React Native version 0.46\n// var upstreamTransformer = require(\"metro-bundler/build/transformer\");\n\nvar postcssTransformer = require(\"react-native-typed-postcss-transformer\");\nvar postCSSExtensions = [\"css\", \"pcss\"]; // \u003c-- Add other extensions if needed.\n\nmodule.exports.transform = function({ src, filename, options }) {\n  if (postCSSExtensions.some(ext =\u003e filename.endsWith(\".\" + ext))) {\n    return postcssTransformer.transform({ src, filename, options });\n  }\n  return upstreamTransformer.transform({ src, filename, options });\n};\n```\n\n## How does it work?\n\nYour `App.css` file might look like this (using [postcss-css-variables](https://github.com/MadLittleMods/postcss-css-variables) plugin):\n\n```css\n:root {\n  --blue-color: blue;\n}\n\n.myClass {\n  color: var(--blue-color);\n}\n.myOtherClass {\n  color: red;\n}\n```\n\nWhen you import your stylesheet:\n\n```js\nimport styles from \"./App.css\";\n```\n\nYour imported styles will look like this:\n\n```js\nvar styles = {\n  myClass: {\n    color: \"blue\"\n  },\n  myOtherClass: {\n    color: \"red\"\n  }\n};\n```\n\nThe generated `App.css.d.ts` file looks like this:\n\n```ts\nexport const myClass: string;\nexport const myOtherClass: string;\n```\n\nYou can then use that style object with an element:\n\n```jsx\n\u003cMyElement style={styles.myClass} /\u003e\n```\n\n## TODO\n\n- Find a way to make the configuration cleaner by only having to add `rn-cli.config.js` to a project, https://github.com/kristerkari/react-native-postcss-transformer/issues/1.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fkristerkari%2Freact-native-typed-postcss-transformer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fkristerkari%2Freact-native-typed-postcss-transformer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fkristerkari%2Freact-native-typed-postcss-transformer/lists"}