_mode.scss

$_osESR: false !default;
$_mediaPref: false !default;

@mixin ESR() {
  $_osESR: true !global;
}

@mixin STANDARD() {
  $_osESR: false !global;
}

@mixin SUPPORT_PREF() {
  $_mediaPref: false !global;
}

@mixin MEDIA_PREF() {
  $_mediaPref: true !global;
}

@function isESR() {
  @return $_osESR;
}

@function isSTANDARD() {
  @return not $_osESR;
}

@function isMediaPref() {
  @return isSTANDARD() and $_mediaPref;
}