css-to-react-native

Converts CSS text to a React Native stylesheet object.

Try it here

font-size:18px;
line-height:24px;
color: red;

{fontSize: 18,lineHeight: 24,color: 'red',}

Converts all number-like values to numbers, and string-like to strings.

Automatically converts indirect values to their React Native equivalents.

text-shadow-offset:10px5px;
font-variant: small-caps;
transform:translate(10px,5px) scale(5);

{textShadowOffset: {width: 10,height: 5},fontVariant: ['small-caps'],// Fixes backwards transform ordertransform: [{translateY: 5},{translateX: 10},{scale: 5},]}

Also allows shorthand values.

font: bold 14px/16px "Helvetica";
margin:5px7px2px;

{fontFamily: 'Helvetica',fontSize: 14,fontWeight: 'bold',fontStyle: 'normal',fontVariant: [],lineHeight: 16,marginTop: 5,marginRight: 7,marginBottom: 2,marginLeft: 7,}

Shorthands will only accept values that are supported in React, so background will only accept a colour, backgroundColor

There is also support for the box-shadow shorthand, and this converts into shadow- properties. Note that these only work on iOS.

Shorthand Notes

border{Top,Right,Bottom,Left} shorthands are not supported, because borderStyle cannot be applied to individual border sides.

API

The API is mostly for implementors. However, the main API may be useful for non-implementors. The main API is an array of [property, value] tuples.

importtransformfrom'css-to-react-native';// or const transform = require('css-to-react-native').default;transform([['font','bold 14px/16px "Helvetica"'],['margin','5px 7px 2px'],['border-left-width','5px'],]);// => { fontFamily: 'Helvetica', ... }

We don't provide a way to get these style tuples in this library, so you'll need to do that yourself. I expect most people will use postCSS or another CSS parser. You should try avoid getting these with string.split, as that has a lot of edge cases (colons and semi-colons appearing in comments etc.)

For implementors, there is also a few extra APIs available.

These are for specific use-cases, and most people should just be using the API above.

import{getPropertyName,getStylesForProperty}from'css-to-react-native';getPropertyName('border-width');// => 'borderWidth'getStylesForProperty('borderWidth','1px 0px 2px 0px');// => { borderTopWidth: 1, ... }

Should you wish to opt-out of transforming certain shorthands, an array of property names in camelCase can be passed as a second argument to transform.

transform([['border-radius','50px']],['borderRadius']);// { borderRadius: 50 } rather than { borderTopLeft: ... }

This can also be done by passing a third argument, false to getStylesForProperty.

License

Licensed under the MIT License, Copyright © 2019 Krister Kari, Jacob Parker, and Maximilian Stoiber.

See LICENSE.md for more information.