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<style> pre { border: 1px solid #eee; } pre.r { background-color: #ffffff; } pre.r code { background-color: #ffffff; } pre.css { margin-top: -1.25rem; background-color: #f8f8f8; border-radius: 0; border-bottom-left-radius: 4px; border-bottom-right-radius: 4px; } </style>

The sass R package provides bindings to LibSass, a fast Sass compiler written in C++. Sass is a mature and stable CSS extension language that makes styling modern websites less complex and more composible.


Install the released version of sass from CRAN:


Install the latest development build from GitHub:

# install.packages("remotes")

Basic usage

To compile Sass into CSS, provide Sass to the input argument of the sass() function. input can be any of the following:

  • An R string (as in the example below).
  • A named list() defining Sass variables.
  • A sass_file(), sass_import(), or sass_layer().
  • A nested list() comprising of all the above.
sass(input = "
  $size: 50%;
  foo { margin: $size * .33; }
foo {
  margin: 16.5%;

Learn more

See sass’s overview vignette as well as the official Sass documentation.

Ask a question

If you have a question about sass, try asking one on

RStudio Ask a question: sass