footnotes usage with gatsby-transformer-remark

[PsyGik]

Hello 👋🏽,

Cross-posting this from gatsby-transformer-remark #30964
, as suggested by a contributor

I am not sure if this change broke the implementation, but this no longer works:

Some Markdown Content[^1]
Another Content
Some More Content[^2]


[^1]: First Footnote
[^2]: Second Footnote
[^3]: Third Footnote // This doesn't get rendered.

This outputs as:

<p>
    Some Markdown Content<sup id="fnref-1"><a href="#fn-1" class="footnote-ref">1</a></sup>
    Another Content
    Some More Content<sup id="fnref-2"><a href="#fn-2" class="footnote-ref">2</a></sup>
</p>
<div class="footnotes">
    <hr>
    <ol>
    <li id="fn-1">First Footnote<a href="#fnref-1" class="footnote-backref">↩</a></li>
    <li id="fn-2">Second Footnote<a href="#fnref-2" class="footnote-backref">↩</a></li>
    </ol>
</div>

The [^3] isn't referenced anywhere in the content, so it doesn't get rendered.

As soon as I add it to the markdown, it get's rendered.

Some Markdown Content[^1]
Another Content[^3]
Some More Content[^2]


[^1]: First Footnote
[^2]: Second Footnote
[^3]: Third Footnote // This doesn't get rendered.

Is this the intended behaviour? Because on "gatsby": "^3.2.1", footnotes used to render without being referenced anywhere else in the markdown

[wooorm]

Yes, this behavior is intended. Here’s the change plus links to discussions: syntax-tree/mdast-util-to-hast@fd38c45