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month](https://img.shields.io/npm/dm/react-native-typed-less-transformer.svg)](http://npmcharts.com/compare/react-native-typed-less-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\nLoad Less files 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 Less 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-less-transformer less\n```\n\n### Step 2: 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\");\nmodule.exports = (async () =\u003e {\n  const {\n    resolver: { sourceExts }\n  } = await getDefaultConfig();\n  return {\n    transformer: {\n      babelTransformerPath: require.resolve(\n        \"react-native-typed-less-transformer\"\n      )\n    },\n    resolver: {\n      sourceExts: [...sourceExts, \"less\"]\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\", \"less\"]\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(\"react-native-typed-less-transformer\");\n  },\n  getSourceExts() {\n    return [\"ts\", \"tsx\", \"less\"];\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\", \"less\"],\n      \"transformer\": \"node_modules/react-native-typed-less-transformer/index.js\"\n    }\n  }\n}\n```\n\n## How does it work?\n\nYour `App.less` file might look like this:\n\n```less\n@nice-blue: #5b83ad;\n@light-blue: @nice-blue + #111;\n\n.myClass {\n  color: @light-blue;\n}\n.myOtherClass {\n  color: red;\n}\n```\n\nWhen you import your stylesheet:\n\n```js\nimport styles from \"./App.less\";\n```\n\nYour imported styles will look like this:\n\n```js\nvar styles = {\n  myClass: {\n    color: \"#6c94be\"\n  },\n  myOtherClass: {\n    color: \"red\"\n  }\n};\n```\n\nThe generated `App.less.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## CSS Custom Properties (CSS variables)\n\n_You need version 0.11.1 or newer_\n\n```css\n:root {\n  --text-color: blue;\n}\n\n.blue {\n  color: var(--text-color);\n}\n```\n\nCSS variables are not supported by default, but you can add support for them by using [PostCSS](https://postcss.org/) and [postcss-css-variables](https://github.com/MadLittleMods/postcss-css-variables#readme) plugin.\n\nStart by installing dependencies:\n\n```sh\nyarn add postcss postcss-css-variables react-native-postcss-transformer --dev\n```\n\nAdd `postcss-css-variables` to your PostCSS configuration with [one of the supported config formats](https://github.com/michael-ciniawsky/postcss-load-config), e.g. `package.json`, `.postcssrc`, `postcss.config.js`, etc.\n\nAfter that create a `transformer.js` file and do the following:\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 lessTransformer = require(\"react-native-typed-less-transformer\");\nvar postCSSTransformer = require(\"react-native-postcss-transformer\");\n\nmodule.exports.transform = function({ src, filename, options }) {\n  if (filename.endsWith(\".less\")) {\n    return lessTransformer\n      .renderToCSS({ src, filename, options })\n      .then(css =\u003e\n        postCSSTransformer.transform({ src: css, filename, options })\n      );\n  } else {\n    return upstreamTransformer.transform({ src, filename, options });\n  }\n};\n```\n\nAfter that in `metro.config.js` point the `babelTransformerPath` to that file:\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(\"./transformer.js\")\n  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