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Automagically generate tests from errors

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An extension that allows inspection of React component hierarchy in the Chrome and Firefox Developer Tools.

why-did-you-render by Welldone Software monkey patches React to notify you about potentially avoidable re-renders. (Works with React Native as well.)

Tweak React components in real time. (Deprecated: use Fast Refresh instead.)

Quick Overview

React Fix It is a lightweight library designed to enhance the debugging experience in React applications. It provides a simple way to display error messages directly in the browser, making it easier for developers to identify and fix issues during development.

Pros

  • Easy to integrate into existing React projects
  • Improves developer experience by providing clear, in-browser error messages
  • Customizable error display options
  • Minimal performance impact when used in development mode

Cons

  • Limited functionality compared to more comprehensive debugging tools
  • May not be suitable for complex debugging scenarios
  • Requires manual integration into each component where error handling is needed
  • Not actively maintained (last update was in 2018)

Code Examples

  1. Basic usage:
import fixIt from 'react-fix-it';

class MyComponent extends React.Component {
  render() {
    return <div>{this.props.nonExistentProp.value}</div>;
  }
}

export default fixIt(MyComponent);

This example wraps a component with the fixIt higher-order component, which will catch and display errors that occur within the component.

  1. Custom error display:
import fixIt from 'react-fix-it';

const customErrorComponent = ({ error }) => (
  <div style={{ color: 'red', border: '1px solid red', padding: '10px' }}>
    Error: {error.message}
  </div>
);

const EnhancedComponent = fixIt(MyComponent, { ErrorComponent: customErrorComponent });

This example demonstrates how to use a custom error component to display errors in a specific format.

  1. Conditional error handling:
import fixIt from 'react-fix-it';

const shouldCatchErrors = process.env.NODE_ENV === 'development';

const EnhancedComponent = shouldCatchErrors ? fixIt(MyComponent) : MyComponent;

This example shows how to conditionally apply error handling based on the environment, ensuring that error messages are only displayed during development.

Getting Started

To use React Fix It in your project, follow these steps:

  1. Install the package:

    npm install react-fix-it
    
  2. Import and use the fixIt function in your components:

    import fixIt from 'react-fix-it';
    import MyComponent from './MyComponent';
    
    const EnhancedComponent = fixIt(MyComponent);
    
    export default EnhancedComponent;
    
  3. Wrap your components with fixIt where you want to catch and display errors.

Competitor Comparisons

An extension that allows inspection of React component hierarchy in the Chrome and Firefox Developer Tools.

Pros of React DevTools

  • Comprehensive debugging and profiling tools for React applications
  • Official tool maintained by the React team, ensuring compatibility and regular updates
  • Integrates seamlessly with browser developer tools

Cons of React DevTools

  • Larger and more complex, potentially overwhelming for beginners
  • Requires installation as a browser extension or standalone app
  • May impact performance when used extensively on large applications

Code Comparison

React DevTools:

// Example of using React DevTools profiler
const MyComponent = React.memo(() => {
  // Component logic
});

React Fix It:

import fixIt from 'react-fix-it';

const MyComponent = fixIt(() => {
  // Component logic
});

React DevTools offers a full suite of debugging and profiling tools, while React Fix It focuses on error handling and recovery. React DevTools is more comprehensive but may be complex for beginners, whereas React Fix It provides a simpler approach to improving component stability. The code comparison shows how React Fix It wraps components for error handling, while React DevTools requires no code changes but offers more advanced features through its interface.

why-did-you-render by Welldone Software monkey patches React to notify you about potentially avoidable re-renders. (Works with React Native as well.)

Pros of why-did-you-render

  • More comprehensive performance analysis, providing detailed insights into unnecessary re-renders
  • Actively maintained with regular updates and improvements
  • Supports both class and functional components, including hooks

Cons of why-did-you-render

  • More complex setup and configuration required
  • Can potentially impact performance if not used carefully in production
  • Steeper learning curve for interpreting results

Code Comparison

why-did-you-render:

import React from 'react';
import whyDidYouRender from '@welldone-software/why-did-you-render';

whyDidYouRender(React, {
  trackAllPureComponents: true,
});

react-fix-it:

import React from 'react';
import fixIt from 'react-fix-it';

const FixedComponent = fixIt(MyComponent);

The why-did-you-render library offers more detailed configuration options and can be applied globally, while react-fix-it provides a simpler wrapper approach for individual components. why-did-you-render is better suited for in-depth performance analysis, whereas react-fix-it focuses on quick fixes for specific components.

Both tools aim to improve React application performance, but why-did-you-render offers a more comprehensive solution at the cost of increased complexity. react-fix-it, on the other hand, provides a simpler approach that may be sufficient for smaller projects or quick debugging sessions.

Tweak React components in real time. (Deprecated: use Fast Refresh instead.)

Pros of react-hot-loader

  • More mature and widely adopted in the React community
  • Supports hot reloading for a broader range of React components and scenarios
  • Integrates well with popular build tools like webpack and Create React App

Cons of react-hot-loader

  • Can be more complex to set up and configure, especially in custom build environments
  • May introduce additional overhead and slightly increase bundle size
  • Occasional issues with state preservation during hot reloading

Code Comparison

react-hot-loader:

import { hot } from 'react-hot-loader/root';
import React from 'react';

const App = () => <div>Hello World!</div>;

export default hot(App);

react-fix-it:

import React from 'react';
import { fixIt } from 'react-fix-it';

const App = () => <div>Hello World!</div>;

export default fixIt(App);

Both libraries aim to improve the development experience by providing hot reloading capabilities for React applications. react-hot-loader offers a more comprehensive solution with broader compatibility, while react-fix-it focuses on simplicity and ease of use. The choice between the two depends on the specific project requirements and the developer's preference for complexity versus simplicity.

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README

React Fix It Build Status

Automagically generate tests from errors.

:warning: This package uses react-component-errors to wrap the lifecycle methods into a try...catch block, which affects the performance of your components. Therefore it should not be used in production.

How to use it

  • Enhance your components with fixIt
  • Write some bugs (or wait for your components to fail)
  • Open the console and copy the test snippet
  • Paste the code to reproduce the error
  • Fix the bugs and celebrate

Demo

https://michelebertoli.github.io/react-fix-it/

Preview

Installation

You can either install it with npm or yarn.

npm install --save-dev react-fix-it

or

yarn add --dev react-fix-it

Example

import React, { Component } from 'react'
import fixIt, { options } from 'react-fix-it'

// defaults to console.log
options.log = (test) => {
  console.warn(test)
  doWatheverYouWant(test)
}

class MyComponent extends Component {
  render() {
    return <div>Hello ⚛</div>
  }
}

export default fixIt(MyComponent)

:bulb: They easiest way to patch automatically all the components in development mode is by using babel-plugin-react-fix-it with the following configuration:

{
  "env": {
    "development": {
      "plugins": ["react-fix-it"]
    }
  }
}

Test

npm test

or

yarn test

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