VSCode Extension cannot find packages indicated in tsconfig.json

[Icexist]

Initial checklist

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

Affected packages and versions

v1.8.6

Link to runnable example

No response

Steps to reproduce

When using the MDX plugin in VSCode, set the tsconfig.json file to have any number of plugins and try to open an mdx file.

It works just fine with the 1.8.5 version (installed via "install other version" in vscode)

my tsconfig.json file:

{
  "include": ["**/*"],
  "compilerOptions": {
    // …
  },
  "mdx": {
    "plugins": [
      "remark-frontmatter",
      "remark-gfm",
      "remark-math",
      "rehype-katex"
    ]
  }
}

Expected behavior

MDX should work as expected.

Actual behavior

The MDX plugin crashes:

Error: Cannot find package 'remark-frontmatter' imported from /home/xxxx/project
at new n (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:858:18648)
at Sq (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:860:7076)
at Xle (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:860:7581)
at Eq (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:860:8808)
at Gv (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:860:8998)
at Lq (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:860:10157)
at async Kv (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:860:9400)
at async Promise.all (index 0)
at async s (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:865:18826)
at async sae (/home/xxxx/.vscode-server/extensions/unifiedjs.vscode-mdx-1.8.6/out/language-server.js:96:5817) {
code: 'ERR_MODULE_NOT_FOUND'
}

Node.js v18.18.2
[Error - 4:13:18 PM] Server process exited with code 1.
[Error - 4:13:18 PM] The MDX server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.

Runtime

No response

Package manager

No response

OS

Windows 10, running VSCode remote in a WSL2 instance. MDX plugin runs on the WSL instance.

Build and bundle tools

No response

[remcohaszing]

In version 1.8.0-1.8.5 there was a bug that caused the language server to ignore the plugins field. So it defaulted to ["remark-frontmatter", "remark-gfm"]. That’s why this worked for you kind of by accident.

You should specify "remark-math", because it adds support for parsing the math syntax, but not "rehype-katex", as this only transforms the AST.

Do you have all those plugins installed in /home/xxxx/project? In other words: Does /home/xxxx/project/node_modules/remark-frontmatter exist and can you import remark-frontmatter from /home/xxxx/project/some-script.mjs? with the following contents:

import 'remark-frontmatter'

[github-actions]

Hi! Thanks for taking the time to contribute! This has been marked by a maintainer as needing more info. It’s not clear yet whether this is an issue. Here are a couple tips:

• Spend time framing the issue! The more time you put into it, the more we will
• Often, maintainers respond with why for several back and forths; rubber duck debugging might help avoid that
• Folks posting issues sometimes fall for xy problems: asking for a certain solution instead of raising the root problem

Thanks,
— bb

[Icexist]

Verify that those (and more) are in node_modules:

I'm running Docusaurus, so i'm not fully clear on how to test the .mjs file, but these extensions work just fine in Docusaurus.

Still have the same problems after removing rehype-katex - the extension can't find the modules.

Here's a fresh repository that shows the issue for me: https://github.com/Icexist/mdx-ext-debug

There is a file docs\test.mdx that triggers the issue.

[Icexist]

As a note, that repo was created on MacOS and showed the issue in VSCode there, so this isn't limited to Windows.

[remcohaszing]

Thanks for the reproduction. I’m able to reproduce this on Linux too.

[remcohaszing]

This was fixed in version 1.8.7 🎉