How To Use Sass With React
react-native-sass-transformer 
Utilize Sass to style your React Native apps.
Behind the scenes the Sass files are transformed to react native style objects (wait at the examples).
This transformer can exist used together with React Native CSS modules.
How does it work?
Your App.scss file might look like this:
%blue { color : blue; } .myClass { @extend %blueish; } .myOtherClass { colour : cherry-red; } .my-dashed-course { color : green; } When you import your stylesheet:
import styles from "./App.scss" ; Your imported styles will look like this:
var styles = { myClass: { color: "blue" } , myOtherClass: { color: "red" } , "my-dashed-class": { color: "dark-green" } } ; You can then use that style object with an element:
Plain React Native:
< MyElement style = { styles . myClass } / > < MyElement mode = {styles [ "my-dashed-class" ] } /> React Native CSS modules using className property:
< MyElement className = { styles . myClass } / > < MyElement className = {styles [ "my-dashed-form" ] } />
React Native CSS modules using styleName property:
< MyElement styleName = "myClass my-dashed-grade" / > Please utilize the .scss file extension for SCSS syntax and the .sass file extension for indented Sass syntax.
Installation and configuration
Footstep i: Install
yarn add --dev react-native-sass-transformer sass Step two: Configure the react native packager
For React Native v0.57 or newer / Expo SDK v31.0.0 or newer
Add this to metro.config.js in your project's root (create the file if it does non exist already):
const { getDefaultConfig } = require ( "metro-config" ) ; module . exports = ( async ( ) => { const { resolver: { sourceExts } } = await getDefaultConfig ( ) ; return { transformer: { babelTransformerPath: require . resolve ( "react-native-sass-transformer" ) } , resolver: { sourceExts: [...sourceExts , "scss" , "sass" ] } } ; } ) ( ) ; If you are using Expo, yous as well need to add this to app.json:
{ "expo": { "packagerOpts": { "config": "metro.config.js" , "sourceExts": [ "js" , "jsx" , "scss" , "sass" ] } } } For React Native v0.56 or older
If 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):
module . exports = { getTransformModulePath ( ) { return require . resolve ( "react-native-sass-transformer" ) ; } , getSourceExts ( ) { return [ "js" , "jsx" , "scss" , "sass" ] ; } } ; For Expo SDK v30.0.0 or older
If you lot are using Expo, instead of adding the rn-cli.config.js file, you need to add this to app.json:
{ "expo": { "packagerOpts": { "sourceExts": [ "js" , "jsx" , "scss" , "sass" ], "transformer": "node_modules/react-native-sass-transformer/index.js" } } } Platform specific extensions
If yous need React Native's platform specific extensions for your Sass files, yous tin use babel-plugin-react-native-platform-specific-extensions. Platform specific extensions for files imported using Sass' @import are supported by default.
Sass options
If you demand to pass options (due east.grand. functions) to sass, you can do so by creating a transformer.js file and doing the following:
// For React Native version 0.59 or later var upstreamTransformer = require ( "metro-react-native-babel-transformer" ) ; // For React Native version 0.56-0.58 // var upstreamTransformer = require("metro/src/reactNativeTransformer"); // For React Native version 0.52-0.55 // var upstreamTransformer = crave("metro/src/transformer"); // For React Native version 0.47-0.51 // var upstreamTransformer = require("metro-bundler/src/transformer"); // For React Native version 0.46 // var upstreamTransformer = require("metro-bundler/build/transformer"); var sassTransformer = require ( "react-native-sass-transformer" ) ; module . exports . transform = function ( { src, filename, options } ) { if ( filename . endsWith ( ".scss" ) || filename . endsWith ( ".sass" ) ) { var opts = Object . assign ( options , { sassOptions: { functions: { "rem($px)": px => { px . setValue ( px . getValue ( ) / xvi ) ; px . setUnit ( "rem" ) ; render px ; } } } } ) ; return sassTransformer . transform ( { src, filename, options: opts } ) ; } else { render upstreamTransformer . transform ( { src, filename, options } ) ; } } ; Afterwards that in metro.config.js point the babelTransformerPath to that file:
const { getDefaultConfig } = crave ( "metro-config" ) ; module . exports = ( async ( ) => { const { resolver: { sourceExts } } = expect getDefaultConfig ( ) ; return { transformer: { babelTransformerPath: require . resolve ( "./transformer.js" ) } , resolver: { sourceExts: [...sourceExts , "scss" , "sass" ] } } ; } ) ( ) ; CSS Custom Backdrop (CSS variables)
You lot need version 1.4.0 or newer
: root { --text-color : blue; } .blue { color : var(--text-colour); } CSS variables are not supported by default, just you can add together support for them by using PostCSS and postcss-css-variables plugin.
Start by installing dependencies:
yarn add postcss postcss-css-variables react-native-postcss-transformer --dev Add together postcss-css-variables to your PostCSS configuration with i of the supported config formats, e.g. package.json, .postcssrc, postcss.config.js, etc.
After that create a transformer.js file and do the post-obit:
// For React Native version 0.59 or afterwards var upstreamTransformer = require ( "metro-react-native-babel-transformer" ) ; // For React Native version 0.56-0.58 // var upstreamTransformer = crave("metro/src/reactNativeTransformer"); // For React Native version 0.52-0.55 // var upstreamTransformer = require("metro/src/transformer"); // For React Native version 0.47-0.51 // var upstreamTransformer = require("metro-bundler/src/transformer"); // For React Native version 0.46 // var upstreamTransformer = require("metro-bundler/build/transformer"); var sassTransformer = require ( "react-native-sass-transformer" ) ; var postCSSTransformer = crave ( "react-native-postcss-transformer" ) ; module . exports . transform = function ( { src, filename, options } ) { if ( filename . endsWith ( ".scss" ) || filename . endsWith ( ".sass" ) ) { return sassTransformer . renderToCSS ( { src, filename, options } ) . then ( css => postCSSTransformer . transform ( { src: css , filename, options } ) ) ; } else { return upstreamTransformer . transform ( { src, filename, options } ) ; } } ; Later on that in metro.config.js point the babelTransformerPath to that file:
const { getDefaultConfig } = require ( "metro-config" ) ; module . exports = ( async ( ) => { const { resolver: { sourceExts } } = await getDefaultConfig ( ) ; return { transformer: { babelTransformerPath: require . resolve ( "./transformer.js" ) } , resolver: { sourceExts: [...sourceExts , "scss" , "sass" ] } } ; } ) ( ) ; Dependencies
This library has the following Node.js modules as dependencies:
- app-root-path
- css-to-react-native-transform
- semver
How To Use Sass With React,
Source: https://github.com/kristerkari/react-native-sass-transformer
Posted by: pricewhave1982.blogspot.com
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