[WARNING] Deprecated: --highlight-style. Use --syntax-highlighting instead.

[chuxinyuan]

Session info

R version 4.6.0 (2026-04-24)
Platform: x86_64-pc-linux-gnu
Running under: Arch Linux, Positron 2026.06.0

Locale:
  LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=zh_CN.UTF-8       
  LC_COLLATE=en_US.UTF-8     LC_MONETARY=zh_CN.UTF-8    LC_MESSAGES=en_US.UTF-8   
  LC_PAPER=zh_CN.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
  LC_TELEPHONE=C             LC_MEASUREMENT=zh_CN.UTF-8 LC_IDENTIFICATION=C       

Package version:
  base64enc_0.1.6   bslib_0.11.0      cachem_1.1.0      callr_3.7.6       cli_3.6.6        
  clipr_0.8.1       compiler_4.6.0    cpp11_0.5.5       digest_0.6.39     dplyr_1.2.1      
  evaluate_1.0.5    fastmap_1.2.0     fontawesome_0.5.3 fs_2.1.0          generics_0.1.4   
  glue_1.8.1        graphics_4.6.0    grDevices_4.6.0   highr_0.12        htmltools_0.5.9  
  jquerylib_0.1.4   jsonlite_2.0.0    knitr_1.51        lifecycle_1.0.5   lubridate_1.9.5  
  magrittr_2.0.5    memoise_2.0.1     methods_4.6.0     mime_0.13         otel_0.2.0       
  pillar_1.11.1     pkgconfig_2.0.3   processx_3.9.0    ps_1.9.3          R6_2.6.1         
  rappdirs_0.3.4    reprex_2.1.1      rlang_1.2.0       rmarkdown_2.31    rstudioapi_0.18.0
  sass_0.4.10       slider_0.3.3      stats_4.6.0       tibble_3.3.1      tidyselect_1.2.1 
  timechange_0.4.0  tinytex_0.59      tools_4.6.0       utf8_1.2.6        utils_4.6.0      
  vctrs_0.7.3       warp_0.2.3        withr_3.0.2       xfun_0.58         yaml_2.3.12   

My code

library(reprex)
reprex({
  print("hello world")
})

Warning info

[chuxinyuan]

rstudio/rmarkdown#2602 This problem also occurred with rmarkdown in the past, but it has been fixed.

[jennybc]

reprex is also trying to do the right thing here:

reprex/R/reprex_render.R

Lines 198 to 203 in 0dcf301

	# pandoc 3.8 deprecated --highlight-style in favor of --syntax-highlighting
	highlighting_flag <- if (rmarkdown::pandoc_available("3.8")) {
	"--syntax-highlighting"
	} else {
	"--highlight-style"
	}

So it feels like ... the pandoc version check in reprex is not getting the same info as when reprex actually executes? 🤔

[chuxinyuan]

So it feels like ... the pandoc version check in reprex is not getting the same info as when reprex actually executes? 🤔

This is the only logical explanation.

By the way, consider a more lightweight litedown, which does not rely on pandoc. Of course, syntax highlighting requires introducing other dependencies, but this lightweight option is good enough for generating web pages.

[chuxinyuan]

@jennybc I'm sorry, I didn't look carefully at your merge history. After I installed the latest development version, this warning disappeared.