How to use the PureComponent function from react

react-dom-server.node.development.js

GitHub: Zheng20010712/source-code-study-zxr

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if (typeof instance.componentShouldUpdate === 'function') {
  error('%s has a method called ' + 'componentShouldUpdate(). Did you mean shouldComponentUpdate()? ' + 'The name is phrased as a question because the function is ' + 'expected to return a value.', name);
}

if (ctor.prototype && ctor.prototype.isPureReactComponent && typeof instance.shouldComponentUpdate !== 'undefined') {
  error('%s has a method called shouldComponentUpdate(). ' + 'shouldComponentUpdate should not be used when extending React.PureComponent. ' + 'Please extend React.Component if shouldComponentUpdate is used.', getComponentNameFromType(ctor) || 'A pure component');
}

if (typeof instance.componentDidUnmount === 'function') {
  error('%s has a method called ' + 'componentDidUnmount(). But there is no such lifecycle method. ' + 'Did you mean componentWillUnmount()?', name);

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