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@welldone-software/why-did-you-render

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@welldone-software/why-did-you-render

Monkey patches React to notify you about avoidable re-renders.


Version published
Weekly downloads
418K
decreased by-3.63%
Maintainers
3
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What is @welldone-software/why-did-you-render?

@welldone-software/why-did-you-render is a tool for debugging unnecessary re-renders in React applications. It helps developers identify and fix performance issues by logging information about why a component re-rendered.

What are @welldone-software/why-did-you-render's main functionalities?

Basic Setup

This code sets up the @welldone-software/why-did-you-render package to track all pure components in a React application. It helps in identifying unnecessary re-renders by logging detailed information.

const React = require('react');
const whyDidYouRender = require('@welldone-software/why-did-you-render');

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

Tracking Specific Components

This code demonstrates how to track a specific component for unnecessary re-renders. By setting the static property `whyDidYouRender` to true, the package will log information whenever `MyComponent` re-renders.

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

whyDidYouRender(React);

class MyComponent extends React.Component {
  static whyDidYouRender = true;
  render() {
    return <div>{this.props.text}</div>;
  }
}

Customizing Log Output

This code customizes the log output by including and excluding specific components. It also enables logging when prop values change. This helps in fine-tuning the debugging process to focus on specific parts of the application.

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

whyDidYouRender(React, {
  logOnDifferentValues: true,
  include: [/^MyComponent$/],
  exclude: [/^SomeOtherComponent$/],
});

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Package last updated on 13 Jun 2024

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