Alfie Kemp

Alfie Kemp


A Classy Approach to Manage Your React Native Styles

A classy approach

Did you ever want to organize your styles properly? This library contains an easy to use API that lets you organize your styles in a classy way.


npm i react-native-use-styles


Using styles

import useStyles from './my-namespaced-styles';

const Component = () ⇒ {
  const s = useStyles();

  return (
    <Text styles={s`.global .namespaced`}>
      Hello World!

Note that we are classy now, and nobody would deny it. Next we’ll define our .global and .namespaced styles to use them in our components as we are doing in this example.

Global styles


import { GlobalStyles } from 'react-native-use-styles';

  global: 'flex:1 fx:dir:row',

We are using aliases or shortcuts to define our styles. This is equivalent to do:

import { GlobalStyles } from 'react-native-use-styles';

  global: {
    flex: 1,
    flexDirection: 'row',

Namespaced styles


import { Styles } from 'react-native-use-styles';

export default Styles({
  reused: 'bg:color:green',
  namespaced: '.global .reused color:purple',

Namespaced styles are a way to isolate a group of styles for a particular part of your app, it could be styles for a component, a screen, etc. This is a way to group semantically and avoid collisions between your styles. Note that we are exporting the result of our namespaced definition.


import { GlobalStyles } from 'react-native-use-styles';

  constants: {
    purple: 'purple',
  path: 'color:$purple',
  object: { color: '$purple' },

You can define constants in your global or namespaced styles that will be available to reuse with the $ prefix.

Computed and Dynamic styles

Computed styles:
import useStyles from './my-namespaced-styles';

const Component = () ⇒ {
  const isPurple = useState(true);
  const s = useStyles([isPurple]);

  return (
    <Text styles={s`fx:1 &purple`}>
      Hello World!

Computed styles are prefixed with the & character. Note that we are passing isPurple as a hook’s dependency to track it changes. We can then use this dependency in our computed styles as following.

import { Styles } from 'react-native-use-styles';

export default Styles({
  computed: {
    purple: ([isPurple]) => ({ color: isPurple ? 'purple' : 'black' });

If the dependencies change, only styles with a computed in it will be recomputed.

Dynamic styles:
import useStyles from './my-namespaced-styles';

const Component = () ⇒ {
  const isPurple = useState(true);
  const s = useStyles();

  return (
    <Text styles={s`fx:1 ${isPurple && '.purple'}`}>
      Hello World!

And a simple style definition as following:

import { Styles } from 'react-native-use-styles';

export default Styles({
  purple: { color: 'purple' },

There are plenty more things you can do with useStyles, learn more in User Guide

Definition order

You want your global styles to be defined or imported before all the other styles. So just import your global styles at the top of your App.js or your main entry point; before the imports of your custom or navigation component.


import './globalStyles'; // ultra safe zone
import React from 'react';

import CustomComponent from './CustomComponent';

export default function App() {
  return <CustomComponent />;

List of aliases

This is the current list of aliases available, we plan to add more.

bot = bottom;
col = column;
dir = direction;
fx = flex;
lt = left;
rt = right;
bg = background;
txt = text;
jf = justify;
pd = padding;
wd = width;
hg = height;


This library was created with performance in mind; useStyles has multiple cache layers to avoid unnecessary renders, calculations, and transformations. More info in the User Guide


We plan to keep working in the library to optimize and add new features (contributions are welcome). If you have an idea that could make this library better we would love to hear it. Please take a look at our Contributing Guidelines to get to know the rules and how to get started with your contribution.

How to run the demo app

In order to contribute with some code you will need to test your changes within the demo app. At the moment the mechanism that we are using to test the lib inside the app is to import it locally. That means that:

You need to install the dependencies on the library in production mode (npm install --only=prod) so you don’t have problems with dual installations of react-native each time you make a change, you need to do a force install of the library inside the demo folder. If the problem persists, after you test or build the app you encounter duplicated issues, you may want to delete the modules of one of the packages, the lib or the demo app, to solve this issue.

If you are comfortable using something like Wix’s wml, it could provide a better development experience for you. We wanted the main contributing option to not require any extra installations or knowledge. Symlinks have not worked and that is why we recommend Wml.


react-native-use-styles is available under the MIT license. See the LICENSE file for more info.


react-native-use-styles is maintained by Rootstrap with the help of our contributors.

Download Details:

Author: rootstrap

Source Code:

#react #react-native #mobile-apps

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A Classy Approach to Manage Your React Native Styles
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How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

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Want to develop app using React Native? Here are the tips that will help to reduce the cost of react native app development for you.
Cost is a major factor in helping entrepreneurs take decisions about investing in developing an app and the decision to hire react native app developers in USA can prove to be fruitful in the long run. Using react native for app development ensures a wide range of benefits to your business. Understanding your business and working on the aspects to strengthen business processes through a cost-efficient mobile app will be the key to success.

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How much does it cost to develop a React Native mobile app?

React Native allows developers to develop mobile apps that have compatibility with Android, iOS & other operating systems. Due to the features like Native-like functionality and single code reusability and the access of various frameworks in the market, React Native has excelled as the most suitable framework for cross-platform mobile app development.

Why Do Businesses Prefer React Native App Development?

React Native is integrated with JS library that works as the fundamental for developing the app UI. Most businesses choose for developing React Native apps just due to their cross-platform & open-source features. A few further reasons why entrepreneurs & developers choose React Native app development include:

• Lowered Expedition Time

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• Lesser Workforce and Resources

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• JavaScript as Programming Language

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If you are an entrepreneur or start-up and looking for cost-effective app development, React Native is one of the ideal options available out there.

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React Native cost depends widely on the complexity of a project or the app requirements. The price may also vary based on business requirements. React Native app development per hour can cost from $20 and $30 per hour in India. It can vary as per different locations.

Is React Native a good choice for mobile apps development?

Yes, React Native is the best choice for mobile app development as React apps are faster to develop and it offers better quality than hybrid apps. Additionally, React Native is a mature cross-platform framework.

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