Sass.compile_file

You're seeing just the function compile_file, go back to Sass module for more information.
Link to this function

compile_file(path, options \\ %{})

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Compiles a file with CSS/SCSS/Sass into CSS string

Examples

iex> Sass.compile_file("application.scss")
{:ok, "a {\n  color: #fff; }\n"}

# With options
iex> Sass.compile_file("application.scss", %{output_style: 3})
{:ok, "a{color:#fff}\n"}