Latex package siunitx not identified by pandoc, even though it is installed

[lamyergeier]

Info

OS: Fedora 39

$ pandoc --version
pandoc 3.1.12.2

siunitx package v3 is installed

$ kpsepath tex | tr ':' '\n' \
  | perl -ne 'm-^(!!)?(/.*?)(//)?$- && print "$2\n"' \
  | while read path; do locate $path ; done | sort -u \

/usr/share/texlive/texmf-dist/tex/generic/tex4ht/siunitx.4ht
/usr/share/texlive/texmf-dist/tex/latex/lwarp/lwarp-common-mathjax-siunitx.sty
/usr/share/texlive/texmf-dist/tex/latex/lwarp/lwarp-lltjp-siunitx.sty
/usr/share/texlive/texmf-dist/tex/latex/lwarp/lwarp-siunitx-v2.sty
/usr/share/texlive/texmf-dist/tex/latex/lwarp/lwarp-siunitx.sty
/usr/share/texlive/texmf-dist/tex/latex/plautopatch/plsiunitx.sty
/usr/share/texlive/texmf-dist/tex/latex/siunitx
/usr/share/texlive/texmf-dist/tex/latex/siunitx/siunitx-abbreviations.cfg
/usr/share/texlive/texmf-dist/tex/latex/siunitx/siunitx-binary.cfg
/usr/share/texlive/texmf-dist/tex/latex/siunitx/siunitx-v2.sty
/usr/share/texlive/texmf-dist/tex/latex/siunitx/siunitx-version-1.cfg
/usr/share/texlive/texmf-dist/tex/latex/siunitx/siunitx.sty
/usr/share/texlive/texmf-dist/tex/luatex/luatexja/patches/lltjp-siunitx.sty

Unable to produce pdf

I did the following:

$ printf 'Thus, total size is $4288+4=\qty{4292}{kiB}$' | pandoc -s --from=markdown+tex_m
ath_dollars+raw_tex --to latex -o a.pdf
Error producing PDF.
! Undefined control sequence.
l.58 Thus, total size is \(4288+4=\qty

Questions

• Question 1. Since tex_math_dollars and raw_tex are enabled extensions for pandoc markdown format, it is sufficient to use --from=markdown instead of --from=markdown+tex_math_dollars+raw_tex. Is my assumption correct?
• Question 2. Why am I getting this error? I read LaTeX: Support siunitx Commands · Issue #3587 · jgm/pandoc, this indicate that siunitx is enabled by default with Pandoc. If not do I need to enable it? If so, how can I do it?
• Question 3. How to get a list of default supported and enabled latex packages in pandoc (irrespective of if they are installed or not)? On Pandoc - Pandoc User’s Guide, there is no mention of siunitx.
• Question 4. Since raw_tex is not available with commonmark_x does it mean that we can not use the following or does it mean that enabled latex package like siunitx can be used freely with commonmark_x?

$ printf 'Thus, total size is $4288+4=\qty{4292}{kiB}$' | pandoc -s --from=commonmark_x --to latex -o a.pdf
Error producing PDF.
! Undefined control sequence.
l.58 Thus, total size is \(4288+4=\qty

[jgm]

Q1: yes
Q2: the issue you cite has to do with parsing siunitx and converting it to other formats. The siunitx package is not included in the default pandoc template, so math that contains macros defined by this package won't compile. The solution is to add \usepackage{siunitx} either in a default template or via header-includes.
Q4: note that raw_tex only matters for tex outside of a math context. Stuff in math mode just gets put in a Math element and will go through to latex verbatim.