We've been asked when bslib will be on CRAN, and when Shiny 1.6.0 (which has bindCache()) will be on CRAN.
UPDATE 2021-01-25: both packages are currently on CRAN, so they can be installed with:
install.packages("bslib")
install.packages("shiny")
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Additionally, if you'd like to use {bslib} with {rmarkdown} you'll currently need the development version:
remotes::install_github("rstudio/rmarkdown")
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