rstudio / rstudio/bslib

Error in `compile_data()` when using `bs_theme()`

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Description

I confirm I have updated to the latest version of bslib via remotes::install_github("rstudio/bslib").

Describe the problem

I am hitting a persistent error with bs_theme() that I am struggling to resolve:

Error in `compile_data()`:
! Error: argument `$color` of `rgba($color, $alpha)` must be a color
        on line 100:20 of ../../../../../../Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/bslib/builtin/bs5/shiny/_variables.scss, in function `rgba`
        from line 100:20 of ../../../../../../Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/bslib/builtin/bs5/shiny/_variables.scss
        from line 218:9 of stdin
>> $table-striped-bg: rgba($primary, 0.06) !default;

Reproducible example (note, I hit this issue locally, but not on posit Cloud so it may be OS-related?):

# Load library
library(bslib)
#> 
#> Attaching package: 'bslib'
#> The following object is masked from 'package:utils':
#> 
#>     page
# Update theme (from example in help notes)
theme <- bs_theme(
  # Controls the default grayscale palette
  bg = "#202123", fg = "#B8BCC2",
  # Controls the accent (e.g., hyperlink, button, etc) colors
  primary = "#EA80FC", secondary = "#48DAC6",
  base_font = c("Grandstander", "sans-serif"),
  code_font = c("Courier", "monospace"),
  heading_font = "'Helvetica Neue', Helvetica, sans-serif",
  # Can also add lower-level customization
  "input-border-color" = "#EA80FC"
)

Created on 2025-10-15 with reprex v2.1.1

Session Info

> devtools::session_info()
─ Session info ─────────────────────────────────────────────────────────────────────────────────────────────────
 setting  value
 version  R version 4.5.1 (2025-06-13)
 os       macOS Sequoia 15.6.1
 system   aarch64, darwin20
 ui       RStudio
 language (EN)
 collate  en_US.UTF-8
 ctype    en_US.UTF-8
 tz       Europe/London
 date     2025-10-15
 rstudio  2025.09.1+401 Cucumberleaf Sunflower (desktop)
 pandoc   3.6.3 @ /Applications/RStudio.app/Contents/Resources/app/quarto/bin/tools/aarch64/ (via rmarkdown)
 quarto   1.6.40 @ /usr/local/bin/quarto

─ Packages ─────────────────────────────────────────────────────────────────────────────────────────────────────

package     * version    date (UTC) lib source

bslib       * 0.9.0.9000 2025-10-15 [1] Github (rstudio/bslib@ba1be9a)

cachem        1.1.0      2024-05-16 [1] CRAN (R 4.5.0)

callr         3.7.6      2024-03-25 [1] CRAN (R 4.5.0)

cli           3.6.5      2025-04-23 [1] CRAN (R 4.5.0)

clipr         0.8.0      2022-02-22 [1] CRAN (R 4.5.0)

devtools      2.4.6      2025-10-03 [1] CRAN (R 4.5.0)

digest        0.6.37     2024-08-19 [1] CRAN (R 4.5.0)

ellipsis      0.3.2      2021-04-29 [1] CRAN (R 4.5.0)

evaluate      1.0.5      2025-08-27 [1] CRAN (R 4.5.0)

fastmap       1.2.0      2024-05-15 [1] CRAN (R 4.5.0)

fs            1.6.6      2025-04-12 [1] CRAN (R 4.5.0)

glue          1.8.0      2024-09-30 [1] CRAN (R 4.5.0)

htmltools     0.5.8.1    2024-04-04 [1] CRAN (R 4.5.0)

jquerylib     0.1.4      2021-04-26 [1] CRAN (R 4.5.0)

jsonlite      2.0.0      2025-03-27 [1] CRAN (R 4.5.0)

knitr         1.50       2025-03-16 [1] CRAN (R 4.5.0)

lifecycle     1.0.4      2023-11-07 [1] CRAN (R 4.5.0)

magrittr      2.0.4      2025-09-12 [1] CRAN (R 4.5.0)

memoise       2.0.1      2021-11-26 [1] CRAN (R 4.5.0)

pillar        1.11.1     2025-09-17 [1] CRAN (R 4.5.0)

pkgbuild      1.4.8      2025-05-26 [1] CRAN (R 4.5.0)

pkgconfig     2.0.3      2019-09-22 [1] CRAN (R 4.5.0)

pkgload       1.4.1      2025-09-23 [1] CRAN (R 4.5.0)

processx      3.8.6      2025-02-21 [1] CRAN (R 4.5.0)

ps            1.9.1      2025-04-12 [1] CRAN (R 4.5.0)

purrr         1.1.0      2025-07-10 [1] CRAN (R 4.5.0)

R6            2.6.1      2025-02-15 [1] CRAN (R 4.5.0)

remotes       2.5.0      2024-03-17 [1] CRAN (R 4.5.0)

reprex      * 2.1.1      2024-07-06 [1] CRAN (R 4.5.0)

rlang         1.1.6      2025-04-11 [1] CRAN (R 4.5.0)

rmarkdown     2.30       2025-09-28 [1] CRAN (R 4.5.0)

rstudioapi    0.17.1     2024-10-22 [1] CRAN (R 4.5.0)

sass          0.4.10     2025-04-11 [1] CRAN (R 4.5.0)

sessioninfo   1.2.3      2025-02-05 [1] CRAN (R 4.5.0)

tibble        3.3.0      2025-06-08 [1] CRAN (R 4.5.0)

usethis       3.2.1      2025-09-06 [1] CRAN (R 4.5.0)

vctrs         0.6.5      2023-12-01 [1] CRAN (R 4.5.0)

withr         3.0.2      2024-10-28 [1] CRAN (R 4.5.0)

xfun          0.53       2025-08-19 [1] CRAN (R 4.5.0)

yaml          2.3.10     2024-07-26 [1] CRAN (R 4.5.0)


[1] /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library


    

  • ── Packages attached to the search path.

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the example with bs_theme() and inspect compile_data() around builtin/bs5/shiny/_variables.scss, especially the rgba($primary, 0.06) expression. Determine why the provided primary color is not accepted during Sass compilation, then verify that the example compiles successfully on the reported macOS and R setup.

Written by the indexing model from the issue text.

Assessment

Tech stack
r, sass
Domain
frontend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
48/100

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