Strikethroughs are not rendered

[nmattia]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and discussions and couldn’t find anything (or linked relevant results below)

Affected package

remark-gfm@4.0.0

Steps to reproduce

I've adapted the function from the README to parse markdown with strikethrough (both single & double tildes):

async function test() {

  const file = await unified()
    .use(remarkParse)
    .use(remarkGfm)
    .use(remarkRehype)
    .use(rehypeStringify)
    .process(`
## Strikethrough

~one~ or ~~two~~ tildes.
            `);

  console.log(String(file))
}

test();

Running the program does not render <del> elements:

<h2>Strikethrough</h2>
<p>~one~ or ~~two~~ tildes.</p>

Happening inside an astro project, though doubt that has an impact:

$ npm list
@nmattia/nmattia.com@0.0.1 /Users/nicolas/nmattia.com
├── @astrojs/check@0.9.4
├── @astrojs/markdown-remark@6.0.0
├── @astrojs/rss@4.0.10
├── @astrojs/sitemap@3.2.1
├── @types/hast@3.0.4
├── astro@5.0.3
├── hast-util-classnames@3.0.0
├── hast-util-is-element@3.0.0
├── prettier-plugin-astro@0.14.1
├── prettier@3.3.3
├── rehype-document@7.0.3
├── rehype-format@5.0.1
├── rehype-katex@6.0.3
├── rehype-raw@7.0.0
├── remark-gfm@4.0.0
├── remark-math@6.0.0
├── the-new-css-reset@1.8.4
├── typescript@5.5.4
└── unist-util-visit@5.0.0

Actual behavior

The output does not include <del> elements:

<h2>Strikethrough</h2>
<p>~one~ or ~~two~~ tildes.</p>

Expected behavior

By default both single and double tildes should be rendered as del elements:

<h2>Strikethrough</h2>
<p><del>one</del> or <del>two</del> tildes.</p>

Runtime

No response

Package manager

No response

Operating system

No response

Build and bundle tools

No response

[wooorm]

Hi Nicolas! Tests work here. So I assume that this is an Astro problem. Or you have out of date dependencies.

[nmattia]

@wooorm thanks! I'll dig a bit deeper then and report back