NPM/PreFigure in PreText using Visual Studio on Windows

[Teresa “Terri” Magnus]

I have a Windows issue that was not resolved during yesterday's office hours despite a valiant attempt. It was recommended that I post here. We installed PreFigure and NPM but could not get npm to be recognized inside a PreText build even though the command npm --version in the terminal gives 10.9.2.

When I view the built document using the desktop version, I see the Diagram Keyboard Controls but no image.

Working in the github cloud instead, the PreFigure diagram is visible by building and viewing so the PreTeXt/PreFigure code is fine. I'm more comfortable working on my machine though and occasionally work offline. As a side note, with all the uninstalls, installs, and updates, I lost the shortcut to PreTeXt build/view/deploy commands in the cloud and now have to use the terminal.

TIA-Terri

[David Austin]

Thanks for this report, Terri.  Sorry I wasn't able to attend yesterday's drop-in.  Would you be able to attend on Monday so that we could troubleshoot together?  I feel like having a back-and-forth over email would probably cover a lot of ground you already covered yesterday.

In the meantime, could you check that node is installed with "node --version" in a terminal?  I'm not as familiar with npm/node in windows installations.

Thanks again,

David

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[Sean Fitzpatrick]

I found node/npm to be the hardest part about doing things on Windows.

Things I would try (but you probably already have):

- check the Windows environment variables to make sure paths are set correctly

- try using Git Bash instead of a Windows terminal

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[Teresa Magnus]

Node 22.16.0 is installed. Monday would be great! I may have created more of a mess after the office hours. Now I'm seeing no output when I build.

Thank you!

Terri

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[David Austin]

I suspect that Sean's suggestions are helpful, but maybe you checked that in yesterday's drop-in.  In any case, I'll see you Monday and we'll get things straightened out!

David

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[Teresa Magnus]

They might be helpful to someone who knows more about the workings of the computer than I do. My son might help me with some of the non-PreTeXt- specific items this weekend, but otherwise I'll wait until Monday. We probably checked some of it at some point but may need to revisit it.

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[Teresa Magnus]

This message may help troubleshoot:

node:internal/modules/cjs/loader:1404

throw err:

Error: Cannot find module 'mathjax-full/js/util/asyncLoad/node.js'

Require stack:

- C:\Users\three\AppData\Local\Programs\Python\Python311\Lib\site-packages\prefig\core\mj_sre\mj-sre-page.js

    at Function._resolveFilename (node:internal/modules/cjs/loader:1401:15)

    at defaultResolveImpl (node:internal/modules/cjs/loader:1057:19)

    at resolveForCJSWithHooks (node:internal/modules/cjs/loader:1062:22)

    at Function._load (node:internal/modules/cjs/loader:1211:37)

    at TracingChannel.traceSync (node:diagnostics_channel:322:14)

    at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)

    at Module.require (node:internal/modules/cjs/loader:1487:12)

    at require (node:internal/modules/helpers:135:16)

    at Object.<anonymous> (C:\Users\three\AppData\Local\Programs\Python\Python311\Lib\site-packages\prefig\core\mj_sre\mj-sre-page.js:34:1)

    at Module._compile (node:internal/modules/cjs/loader:1730:14) {

  code: 'MODULE_NOT_FOUND',

  requireStack: [

    'C:\\Users\\three\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\site-packages\\prefig\\core\\mj_sre\\mj-sre-page.js'

  ]

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[David Austin]

OK, that's helpful.  It looks like MathJax wasn't installed.  Is there a folder called "node-modules" in the folder C:\\Users\\three\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\site-packages\\prefig\\core\\mj_sre\\?

[Teresa Magnus]

No, only mj-sre-page.js and package.json.

On Friday, June 13, 2025 at 03:37:17 PM EDT, David Austin <david.a...@gmail.com> wrote:

OK, that's helpful.  It looks like MathJax wasn't installed.  Is there a folder called "node-modules" in the folder C:\\Users\\three\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\site-packages\\prefig\\core\\mj_sre\\?

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[David Austin]

OK, try this.  From the terminal, give these commands

cd C:\\Users\\three\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\site-packages\\prefig\\core\\mj_sre\\

npm install

After a few seconds, you should have node-modules in that folder.  Then try compiling a PreFigure diagram again.

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[Teresa Magnus]

Success! Thank you!

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[David Austin]

Thanks for your patience, Terri.  Your report is really helpful to me.

David

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