Andrew Rhodes

Andrew Rhodes

1614150300

React Native Specific Accessibility Linting Rules

eslint-plugin-react-native-a11y

Eslint-plugin-react-native-a11y is a collection of React Native specific ESLint rules for identifying accessibility issues. Building upon the foundation set down by eslint-plugin-jsx-a11y, eslint-plugin-react-native-a11y detects a few of the most commonly made accessibility issues found in react native apps. These rules make it easier for your apps to be navigable by users with screen readers.

Setup

Pre-Requisites

Before starting, check you already have ESLint as a devDependency of your project.

Projects created using react-native init will already have this, but for Expo depending on your template you may need to follow ESLint’s installation instructions.

Installation

Next, install eslint-plugin-react-native-a11y:

npm install eslint-plugin-react-native-a11y --save-dev

# or

yarn add eslint-plugin-react-native-a11y --dev

Note: If you installed ESLint globally (using the -g flag in npm, or the global prefix in yarn) then you must also install eslint-plugin-react-native-a11y globally.

Configuration

This plugin exposes four recommended configs.

Name Description
basic Only use basic validation rules common to both iOS & Android
ios Use all rules from “basic”, plus iOS-specific extras
android Use all rules from “basic”, plus Android-specific extras
all Use all rules from “basic”, plus iOS-specific extras, plus Android-specific extras

If your project only supports a single platform, you may get the best experience using a platform-specific config. This will both avoid reporting issues which do not affect your platform and also results in slightly faster linting for larger projects.

If you are unsure which one to use, in most cases all can be safely used.

Add the config you want to use to the extends section of your ESLint config using the pattern plugin:react-native-a11y/ followed by your config name, as shown below:

// .eslintrc.js

module.exports = {
  root: true,
  extends: [
    '@react-native-community',
    'plugin:react-native-a11y/ios'
  ]
};

Alternatively if you do not want to use one of the pre-defined configs — or want to override the behaviour of a specific rule — you can always include a list rules and configurations in the rules section of your ESLint config.

// .eslintrc.js

module.exports = {
  root: true,
  extends: [
    '@react-native-community',
  ],
  rules: {
    'react-native-a11y/rule-name': 2
  }
};

For more information on configuring behaviour of an individual rule, please refer to the ESLint docs

Supported Rules

Basic

iOS

Android

Rule Options

The following options are available to customize the recommended rule set.

Custom Touchables

react-native-a11y/has-accessibility-props and react-native-a11y/no-nested-touchables allow you to define an array of names for custom components that you may have that conform to the same accessibility interfaces as Touchables.

"react-native-a11y/has-accessibility-props": [
  "error",
  {
    "touchables": ["TouchableCustom"]
  }
]
Custom Invertable Components (iOS)

react-native-a11y/has-valid-accessibility-ignores-invert-colors allows you to optionally define an Array of component names to check in addition to <Image />.

For more information, see the rule docs.

"react-native-a11y/has-valid-accessibility-ignores-invert-colors": [
  "error",
  {
    "invertableComponents": [
      "FastImage",
    ]
  }
]

Creating a new rule

If you are developing new rules for this project, you can use the create-rule script to scaffold the new files.

$ ./scripts/create-rule.js my-new-rule

Attribution

This project started as a fork of eslint-plugin-jsx-a11y and a lot of the work was carried out by its contributors, to whom we owe a lot!

License

eslint-plugin-react-native-a11y is licensed under the MIT License.

Maintenance Status

Active: Formidable is actively working on this project, and we expect to continue for work for the foreseeable future. Bug reports, feature requests and pull requests are welcome.

Download Details:

Author: FormidableLabs

Source Code: https://github.com/FormidableLabs/eslint-plugin-react-native-a11y

#react-native #react #mobile-apps

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React Native Specific Accessibility Linting Rules
Autumn  Blick

Autumn Blick

1598839687

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.

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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:

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  • 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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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

• Simple UI

• Cross-Platform and Code Sharing

• Lesser Workforce and Resources

• Community Assistance

• In-Built Elements and Reusable Codes

• Hot Reload

• JavaScript as Programming Language

• Easy to Execute Updates

Factors That Decide Cost of React Native App Development

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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