gengitkan/client/src/components/Page.tsx

import React from 'react';
import { Navbar } from './Navbar';

export interface PageProps {
  title?: string
}

export class Page extends React.PureComponent<PageProps> {
  render() {
    return (
      <React.Fragment>
        <Navbar />
        {this.props.children}
      </React.Fragment>
    );
  }

  componentDidMount() {
    this.updateTitle();
  }

  componentDidUpdate() {
    this.updateTitle();
  }

  updateTitle() {
    const { title } = this.props;
    if (title !== undefined) window.document.title = title;
  }
}