strudel/website/src/components/Header/SidebarToggle.tsx

/** @jsxImportSource preact */
import type { FunctionalComponent } from 'preact';
import { useState, useEffect } from 'preact/hooks';

const MenuToggle: FunctionalComponent = () => {
  const [sidebarShown, setSidebarShown] = useState(false);

  useEffect(() => {
    const body = document.querySelector('body')!;
    if (sidebarShown) {
      body.classList.add('mobile-sidebar-toggle');
    } else {
      body.classList.remove('mobile-sidebar-toggle');
    }
  }, [sidebarShown]);

  return (
    <button
      type="button"
      aria-pressed={sidebarShown ? 'true' : 'false'}
      id="menu-toggle"
      onClick={() => setSidebarShown(!sidebarShown)}
    >
      <svg
        xmlns="http://www.w3.org/2000/svg"
        width="1em"
        height="1em"
        fill="none"
        viewBox="0 0 24 24"
        stroke="currentColor"
      >
        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
      </svg>
      <span className="sr-only">Toggle sidebar</span>
    </button>
  );
};

export default MenuToggle;