example.php

<?php

$converter->when(
  fn(Heading $node) => // => reflection-based overloading
    HtmlElement::fromString( // => complex types from string template syntax
      '<h1 class="font-2xl">:text</h1>',
      ['text' => $node->text]
    )
);

$converter->convert('# hello world'); // => <h1 class="font-2xl">hello world</h1>

// benefits:
// - very easy to set up
// - don't need to know how to manually create custom renderers or about the internal structure
// - can further manipulate complex types once the basics are bootstrapped using this approach

$converter->when(
  fn(Heading $node) => HtmlElement::fromString(
    match ($node->level) {
      default => '<h1 class="font-2xl">:text</h1>',
      2 => '<span><a href="#:id">link</a><h2 class="font-xl">:text</h2></span>',
      3 => '<h3 id=":id" class="font-lg">:text</h3>',
    },
    [
      'text' => $node->text,
      'id' => slug($node->text),
    ]
  )
);