Turbopack doesnt support magic comments

Link to the code that reproduces this issue

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To Reproduce

I'm using dynamic imports with MDX to load in some mdx that lives outside the app dir. The approved method for this is to use dynamic imports so the file and it's images stay inside the module graph.

Each blog post has a folder with the MDX file and the images related to that post. The problem comes when there are other files in the folder, Webpack wants to slurp them all up because of the way dynamic imports work:

So I'm using "magic comments" to exclude the files I don't need:

const { default: MDXContent } = await import(/* webpackExclude: /\.mp4$/ */ `../../../../content/${filePath}`);

These magic comments work in Webpack, RSPack but not Turbopack.

Any plans to support them? Or another way to ignore certain files?

Current vs. Expected behavior

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Provide environment information

"next": "15.0.1"

Which area(s) are affected? (Select all that apply)

Turbopack

Which stage(s) are affected? (Select all that apply)

next dev (local), next build (local)

Additional context

No response

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I did not open this issue, but it is relevant to me, what can I do to help?

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I think my reproduction is good enough, why aren't you looking into it quickly?

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vercel / next.js