Comma missing in aligned cases block when using Typst

[markjholmes]

Bug description

Comma doesn't render when the following criteria are all met:

1. Making a pdf via Typst (format: typst)
2. In a math block ($$ ... $$)
3. In a "cases" block (\begin{cases} ... \end{cases})
4. Making the lines aligned (including a & character)

Using format: pdf (i.e. via LaTeX) works fine.

Steps to reproduce

---
format: typst
---

Comma appears ok in single line

$$
a = b + c,
$$

Comma appears ok in aligned block

$$
\begin{aligned}
a = b + c,
\end{aligned}
$$

Comma appears ok in aligned block with `&`

$$
\begin{aligned}
a &= b + c,
\end{aligned}
$$

Comma appears ok in cases block
$$
\begin{cases}
a = b + c,
\end{cases}
$$

Comma **missing** in cases block with `&`
$$
\begin{cases}
a &= b + c,
\end{cases}
$$

Comma **missing** in cases block with `&` but full stop ok

$$
\begin{cases}
a &= b + c, \\
a &= b + c.
\end{cases}
$$

Expected behavior

A comma should be there

Actual behavior

The comma is not there

Your environment

VSCode info:

Version: 1.97.0-insider (user setup)
Commit: 69d97b0773575a75736850370918e1171cfde5c6
Date: 2025-01-13T09:58:56.423Z
Electron: 32.2.7
ElectronBuildId: 10660205
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Windows_NT x64 10.0.22631

WSL info (Quarto installed on WSL):

WSL version: 2.3.26.0
Kernel version: 5.15.167.4-1
WSLg version: 1.0.65
MSRDC version: 1.2.5620
Direct3D version: 1.611.1-81528511
DXCore version: 10.0.26100.1-240331-1435.ge-release
Windows version: 10.0.22631.4602

Quarto check output

Quarto 1.6.37
[✓] Checking environment information...
      Quarto cache location: /home/user_name/.cache/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.6.37
      Path: /opt/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2024.11
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /home/user_name/.TinyTeX/bin/x86_64-linux
      Version: 2024

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.10.12
      Path: /usr/bin/python3
      Jupyter: 5.7.2
      Kernels: python3, julia-1.10

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.4.0
      Path: /usr/lib/R
      LibPaths:
        - /home/user_name/R/x86_64-pc-linux-gnu-library/4.4
        - /usr/local/lib/R/site-library
        - /usr/lib/R/site-library
        - /usr/lib/R/library
      knitr: 1.49
      rmarkdown: 2.29

[✓] Checking Knitr engine render......OK

[mcanouil]

Quarto does not do anything on Math, this is Pandoc.

See answers from another threads:

• typst format does not render LaTeX equations properly #11845 (comment)

This is not Quarto's doing, but rather Pandoc. Please create a pure-pandoc (.md file, run with pandoc) reproduction and file at https://github.com/jgm/pandoc. Thank you!

• typst format does not render LaTeX equations properly #11845 (comment)

I wouldn't expect this to work in Pandoc either. LaTeX works in HTML due to MathJax; LaTeX is not ever translated by Pandoc inside of Markdown.

As a workaround I would suggest mitex via the quarto extension

https://github.com/quarto-ext/mitex

(I haven't tried this myself.)