Incorrect bs_base_colors() error messages

[ndunnewind]

I think these error messages should be swapped.

bslib:::bs_base_colors(bslib::bs_theme(), bg = "white")

Error in bslib:::bs_base_colors(bslib::bs_theme(), bg = "white") : 
  Cannot specify fg without bg.

bslib:::bs_base_colors(bslib::bs_theme(), fg = "white")

Error in bslib:::bs_base_colors(bslib::bs_theme(), fg = "white") : 
  Cannot specify bg without fg.

Session Info

- Session info --------------------------------------------------------------------------------------------------------------------------------------
 setting  value                       
 version  R version 4.1.1 (2021-08-10)
 os       Windows 10 x64              
 system   x86_64, mingw32             
 ui       RStudio                     
 language (EN)                        
 collate  English_Netherlands.1252    
 ctype    English_Netherlands.1252    
 tz       Europe/Berlin               
 date     2021-12-15                  

Packages ------------------------------------------------------------------------------------------------------------------------------------------

package     * version    date       lib source

bslib         0.3.1.9000 2021-12-15 [1] Github (rstudio/bslib@888fbe0)

cachem        1.0.6      2021-08-19 [1] CRAN (R 4.1.2)

callr         3.7.0      2021-04-20 [1] CRAN (R 4.1.0)

cli           3.0.0      2021-06-30 [1] CRAN (R 4.1.0)

crayon        1.4.1      2021-02-08 [1] CRAN (R 4.1.0)

curl          4.3.2      2021-06-23 [1] CRAN (R 4.1.0)

desc          1.3.0      2021-03-05 [1] CRAN (R 4.1.0)

devtools      2.4.2      2021-06-07 [1] CRAN (R 4.1.0)

digest        0.6.29     2021-12-01 [1] CRAN (R 4.1.2)

ellipsis      0.3.2      2021-04-29 [1] CRAN (R 4.1.0)

fastmap       1.1.0      2021-01-25 [1] CRAN (R 4.1.0)

fs            1.5.2      2021-12-08 [1] CRAN (R 4.1.2)

glue          1.4.2      2020-08-27 [1] CRAN (R 4.1.0)

htmltools     0.5.2      2021-08-25 [1] CRAN (R 4.1.2)

jquerylib     0.1.4      2021-04-26 [1] CRAN (R 4.1.0)

jsonlite      1.7.2      2020-12-09 [1] CRAN (R 4.1.0)

lifecycle     1.0.0      2021-02-15 [1] CRAN (R 4.1.0)

magrittr      2.0.1      2020-11-17 [1] CRAN (R 4.1.0)

memoise       2.0.1      2021-11-26 [1] CRAN (R 4.1.2)

pkgbuild      1.2.0      2020-12-15 [1] CRAN (R 4.1.0)

pkgload       1.2.1      2021-04-06 [1] CRAN (R 4.1.0)

prettyunits   1.1.1      2020-01-24 [1] CRAN (R 4.1.0)

processx      3.5.2      2021-04-30 [1] CRAN (R 4.1.0)

ps            1.6.0      2021-02-28 [1] CRAN (R 4.1.0)

purrr         0.3.4      2020-04-17 [1] CRAN (R 4.1.0)

R6            2.5.1      2021-08-19 [1] CRAN (R 4.1.1)

remotes       2.4.0      2021-06-02 [1] CRAN (R 4.1.0)

rlang         0.4.12     2021-10-18 [1] CRAN (R 4.1.2)

rprojroot     2.0.2      2020-11-15 [1] CRAN (R 4.1.0)

rstudioapi    0.13       2020-11-12 [1] CRAN (R 4.1.0)

sass          0.4.0      2021-05-12 [1] CRAN (R 4.1.0)

sessioninfo   1.1.1      2018-11-05 [1] CRAN (R 4.1.0)

testthat      3.0.4      2021-07-01 [1] CRAN (R 4.1.0)

usethis       2.0.1      2021-02-10 [1] CRAN (R 4.1.0)

withr         2.4.2      2021-04-18 [1] CRAN (R 4.1.0)

[AyushBipinPatel]

I agree with @ndunnewind , I am receiving the same error message when trying to set the bg argument. However, works perfectly fine if I add the fg argument as well.