// Font Family Key Function
//
// Returns the key for a font family, or the key for an aliased font family.

@function font-family-key($family) {
  @if (map-has-key($fonts, $family)) {
    @return $family;
  }
  @else if (variable-exists(font-aliases) and map-has-key($font-aliases, $family)) {
    @return map-get($font-aliases, $family);
  }
  @else {
    @return flask-error('Could not find requested font `#{$family}` in `$fonts` or `$font-aliases`.');
  }
}