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https://github.com/kristerkari/react-native-postcss-transformer
Use PostCSS to style your React Native apps.
https://github.com/kristerkari/react-native-postcss-transformer
loader postcss react-native transformer
Last synced: 16 days ago
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Use PostCSS to style your React Native apps.
- Host: GitHub
- URL: https://github.com/kristerkari/react-native-postcss-transformer
- Owner: kristerkari
- License: mit
- Created: 2018-01-21T22:54:12.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2024-09-16T08:29:08.000Z (about 2 months ago)
- Last Synced: 2024-09-23T21:24:43.355Z (about 2 months ago)
- Topics: loader, postcss, react-native, transformer
- Language: JavaScript
- Homepage:
- Size: 982 KB
- Stars: 28
- Watchers: 3
- Forks: 8
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# react-native-postcss-transformer [](https://www.npmjs.org/package/react-native-postcss-transformer) [](http://npmcharts.com/compare/react-native-postcss-transformer?periodLength=30) [](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github)
Use [PostCSS](https://github.com/postcss/postcss) to style your React Native apps.
Behind the scenes the PostCSS files are transformed to [react native style objects](https://facebook.github.io/react-native/docs/style.html) (look at the examples).
> This transformer can be used together with [React Native CSS modules](https://github.com/kristerkari/react-native-css-modules).
## How does it work?
Your `App.css` file might look like this (using [postcss-css-variables](https://github.com/MadLittleMods/postcss-css-variables) plugin):
```css
:root {
--blue-color: blue;
}
.myClass {
color: var(--blue-color);
}
.myOtherClass {
color: red;
}
.my-dashed-class {
color: green;
}
```
When you import your stylesheet:
```js
import styles from "./App.css";
```
Your imported styles will look like this:
```js
var styles = {
myClass: {
color: "blue"
},
myOtherClass: {
color: "red"
},
"my-dashed-class": {
color: "green"
}
};
```
You can then use that style object with an element:
**Plain React Native:**
```jsx
```
**[React Native CSS modules](https://github.com/kristerkari/react-native-css-modules) using [className](https://github.com/kristerkari/babel-plugin-react-native-classname-to-style) property:**
```jsx
```
**[React Native CSS modules](https://github.com/kristerkari/react-native-css-modules) using [styleName](https://github.com/kristerkari/babel-plugin-react-native-stylename-to-style) property:**
```jsx
```
## Installation and configuration
### Step 1: Install
```sh
npm install --save-dev react-native-postcss-transformer postcss
```
or
```sh
yarn add --dev react-native-postcss-transformer postcss
```
### Step 2: Add your PostCSS config and install your PostCSS plugins
Add 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.
### Step 3: Configure the react native packager
#### For Expo SDK v41.0.0 or newer
Merge the contents from your project's `metro.config.js` file with this config (create the file if it does not exist already).
`metro.config.js`:
```js
const { getDefaultConfig } = require("expo/metro-config");
module.exports = (() => {
const config = getDefaultConfig(__dirname);
const { transformer, resolver } = config;
config.transformer = {
...transformer,
babelTransformerPath: require.resolve("./postcss-transformer.js")
};
config.resolver = {
...resolver,
sourceExts: [...sourceExts, "css", "pcss"]
};
return config;
})();
```
---
#### For React Native v0.72.1 or newer
Merge the contents from your project's `metro.config.js` file with this config (create the file if it does not exist already).
`metro.config.js`:
```js
const { getDefaultConfig, mergeConfig } = require("@react-native/metro-config");
const defaultConfig = getDefaultConfig(__dirname);
const { assetExts, sourceExts } = defaultConfig.resolver;
/**
* Metro configuration
* https://reactnative.dev/docs/metro
*
* @type {import('metro-config').MetroConfig}
*/
const config = {
transformer: {
babelTransformerPath: require.resolve("./postcss-transformer.js")
},
resolver: {
sourceExts: [...sourceExts, "css", "pcss"]
}
};
module.exports = mergeConfig(defaultConfig, config);
```
### Step 4: Add transformer file
Create `postcss-transformer.js` file to your project's root and specify supported extensions:
```js
const upstreamTransformer = require("@react-native/metro-babel-transformer");
const postcssTransformer = require("react-native-postcss-transformer");
const postCSSExtensions = ["css", "pcss"]; // <-- Add other extensions if needed.
module.exports.transform = function ({ src, filename, ...rest }) {
if (postCSSExtensions.some((ext) => filename.endsWith("." + ext))) {
return postcssTransformer.transform({ src, filename, ...rest });
}
return upstreamTransformer.transform({ src, filename, ...rest });
};
```
## Dependencies
This library has the following Node.js modules as dependencies:
- [css-to-react-native-transform](https://github.com/kristerkari/css-to-react-native-transform)
- [postcss-load-config](https://github.com/michael-ciniawsky/postcss-load-config)
## TODO
- Find a way to make the configuration cleaner by only having to add `metro.config.js` to a project, https://github.com/kristerkari/react-native-postcss-transformer/issues/1.