preact/compat/src/PureComponent.js

Fast 3kb React-compatible Virtual DOM library.

import { Component } from 'preact';
import { shallowDiffers } from './util';

/**
 * Component class with a predefined `shouldComponentUpdate` implementation
 */
export class PureComponent extends Component {
	constructor(props) {
		super(props);
		// Some third-party libraries check if this property is present
		this.isPureReactComponent = true;
	}

	shouldComponentUpdate(props, state) {
		return (
			shallowDiffers(this.props, props) || shallowDiffers(this.state, state)
		);
	}
}