layers.md
In sass: Syntactically Awesome Style Sheets ('Sass')

sass layer format

Code
  format(core)
Output
  [1] "@function my_invert($color, $amount: 100%) {\n    $inverse: change-color($color, $hue: hue($color) + 180);\n    @return mix($inverse, $color, $amount);\n  }\n$color: blue !default;\nbody { background-color: $color; color: my_invert($color); }"

Code
  core
Output
  /* Sass Bundle */
  @function my_invert($color, $amount: 100%) {
      $inverse: change-color($color, $hue: hue($color) + 180);
      @return mix($inverse, $color, $amount);
    }
  $color: blue !default;
  body { background-color: $color; color: my_invert($color); }
  /* *** */

sass_layer_file() basically works

Code
  str(sass_layer_file(f))
Output
  List of 1
   $ layers:List of 1
    ..$ :List of 7
    .. ..$ functions       : chr [1:7] "@function color-contrast($color) {" "  @return if(" "    red($color) * 0.299 + green($color) * 0.587 + blue($color) * 0.114 > 186," "    black, white" ...
    .. ..$ defaults        : chr [1:2] "$body-color:            color-contrast($body-bg) !default;" ""
    .. ..$ mixins          : chr [1:4] "@mixin body-color {" "  color: $body-color" "}" ""
    .. ..$ rules           : chr [1:3] "body {" "  @include body-color;" "}"
    .. ..$ declarations    : NULL
    .. ..$ html_deps       : NULL
    .. ..$ file_attachments: chr(0) 
    .. ..- attr(*, "class")= chr [1:2] "sass_layer" "list"
   - attr(*, "class")= chr "sass_bundle"