preact/compat/src/PureComponent.js

Fast 4kb React-compatible Virtual DOM library.

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

// Built in a factory so bundlers can drop it when unused
function createPureComponent() {
	/**
	 * Component class with a predefined `shouldComponentUpdate` implementation
	 */
	function PureComponent(p, c) {
		this.props = p;
		this.context = c;
	}
	PureComponent.prototype = new Component();
	// Some third-party libraries check if this property is present
	PureComponent.prototype.isPureReactComponent = true;
	PureComponent.prototype.shouldComponentUpdate = function (props, state) {
		return (
			shallowDiffers(this.props, props) || shallowDiffers(this.state, state)
		);
	};
	return PureComponent;
}

export const PureComponent = /* @__PURE__ */ createPureComponent();