first commit

vendor/symfony/mime/HtmlToTextConverter/DefaultHtmlToTextConverter.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime\HtmlToTextConverter;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class DefaultHtmlToTextConverter implements HtmlToTextConverterInterface
+{
+    public function convert(string $html, string $charset): string
+    {
+        return strip_tags(preg_replace('{<(head|style)\b.*?</\1>}is', '', $html));
+    }
+}

vendor/symfony/mime/HtmlToTextConverter/HtmlToTextConverterInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime\HtmlToTextConverter;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface HtmlToTextConverterInterface
+{
+    /**
+     * Converts an HTML representation of a Message to a text representation.
+     *
+     * The output must use the same charset as the HTML one.
+     */
+    public function convert(string $html, string $charset): string;
+}

vendor/symfony/mime/HtmlToTextConverter/LeagueHtmlToMarkdownConverter.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime\HtmlToTextConverter;
+
+use League\HTMLToMarkdown\HtmlConverter;
+use League\HTMLToMarkdown\HtmlConverterInterface;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class LeagueHtmlToMarkdownConverter implements HtmlToTextConverterInterface
+{
+    public function __construct(
+        private HtmlConverterInterface $converter = new HtmlConverter([
+            'hard_break' => true,
+            'strip_tags' => true,
+            'remove_nodes' => 'head style',
+        ]),
+    ) {
+    }
+
+    public function convert(string $html, string $charset): string
+    {
+        return $this->converter->convert($html);
+    }
+}