beamer_presentation does not resolve latex_dependencies

[cderv]

---
output: 
  pdf_document:
    keep_tex: true
    keep_md: true
---

```{r}
knitr::asis_output("", meta = list(rmarkdown::latex_dependency("longtable")))
```

\begin{longtable}{r|r}
\hline
speed & dist\\
\hline
4 & 2\\
\end{longtable}

This will throw:

output file: test.knit.md

! LaTeX Error: Environment longtable undefined.

pdf_document does not. This is because we don't resolve depdencies in beamer_presentation format.

extra_dependencies is not even allowed argument

Initially from https://community.rstudio.com/t/apparent-bug-in-rmarkdown-to-beamer-using-gt/164778

[setgree]

Hi there, I am weighing in to say that I am encountering this issue as well. I am working on this presentation: https://github.com/setgree/vegan-meta/blob/main/vegan-meta-presentation.Rmd

and getting a million errors that all basically look like

This is LuaHBTeX, Version 1.18.0 (TeX Live 2024) 
 restricted system commands enabled.
tlmgr search --file --global '/bkm-pdftex.def'
Trying to automatically install missing LaTeX packages...
tlmgr install bookmark
tlmgr: package repository https://ctan.math.illinois.edu/systems/texlive/tlnet (verified)
tlmgr install: package already present: bookmark
This is LuaHBTeX, Version 1.18.0 (TeX Live 2024) 
 restricted system commands enabled.
tlmgr search --file --global '/bkm-pdftex.def'
! Undefined control sequence.
\@currentHref ->table.\theHtable 

Error: LaTeX failed to compile vegan-meta-presentation.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See vegan-meta-presentation.log for more info.
Execution halted

I commented something to this effect here as well before I found this issue

[cderv]

@atusy would you like to give it try ?

pdf_document does handle extra dependencies

rmarkdown/R/pdf_document.R

Lines 181 to 185 in e1c93a9

	if (length(extra_dependencies) || has_latex_dependencies(knit_meta)) {
	extra_dependencies <- latex_dependencies(extra_dependencies)
	all_dependencies <- append(extra_dependencies, flatten_latex_dependencies(knit_meta))
	args <- c(args, append_in_header(latex_dependencies_as_string(all_dependencies)))
	}

but it seems beamer_presentation does not. I believe the same can be done so that latex_dependencies from any R package are correctly retrieved and inserted.

[atusy]

@cderv Sure!