React-Helmet のソースコードを読んでみる - Qiita

import React from "react"; import PropTypes from "prop-types"; import withSideEffect from "react-side-effect"; // 省略 const Helmet = Component => class HelmetWrapper extends React.Component { // 省略 render() { const {children, ...props} = this.props; let newProps = {...props}; if (children) { newProps = this.mapChildrenToProps(children, newProps); } return <Component {...newProps} />; } const NullCo