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Dylan N ngduc

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jondlm / README.md
Last active January 3, 2018 05:59
React shallow render lifecycle breakdown

React introduced shallow rendering in 0.13. This is an excellent feature that I wish was included earlier in React. It aims to solve the problem of unit testing components without going through a real, or jsdom mocked, DOM. I couldn't find any info online about what lifecycle events it actually fires. So I did some testing of my own. To reproduce, put component.js and test.js into a folder and run node test.js.

TLDR; shallow rendering only invokes the following lifecycle hooks (in order):

  1. getDefaultProps
  2. getInitialState
  3. componentWillMount stops here until re-render
  4. componentWillReceiveProps
  5. shouldComponentUpdate
  6. componentWillUpdate
//
// Regular Expression for URL validation
//
// Author: Diego Perini
// Created: 2010/12/05
// Updated: 2018/09/12
// License: MIT
//
// Copyright (c) 2010-2018 Diego Perini (http://www.iport.it)
//