fix(dev): update remark-mdx-frontmatter

[MichaelDeBoey]

Fix for GHSA-f7f6-9jq7-3rqj

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Closes #10576

CC/ @Evanion

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[Copilot]

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• packages/remix-dev/package.json: Language not supported
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packages/remix-dev/compiler/plugins/mdx.ts:4

• Verify that 'remark-mdx-frontmatter' now provides a default export. If the package version does not support default exports, this change may lead to runtime errors.

import remarkMdxFrontmatter from "remark-mdx-frontmatter";

[charIeszhao]

@brophdawg11 Hi Matt, could you please take a look at this PR and solve the vulnerability issue?

[brophdawg11]

Does anyone know why the tests are failing? Looks to be an ESM/CJS issue

[charIeszhao]

Does anyone know why the tests are failing? Looks to be an ESM/CJS issue

Seems like remix-run does not support ESM...

[crestwood204]

To solve the cjs/esm issue, you can use a dynamic import inside the processMDX function and get rid of the import at the top of the file.

let remarkMdxFrontmatter = await import("remark-mdx-frontmatter");

However, trying this with the tests is giving me other mdx specific errors.

Just need to do let remarkMdxFrontmatter = await import("remark-mdx-frontmatter").default;

I created a PR with my changes here: #10589

[crestwood204]

looks like the integration tests are only failing on msedge. Are those tests flaky? Can you re-trigger them and see if they pass? Would love to get this fix in sooner rather than later since it seems that it can't be solved with an override 🙏