// stylelint-disable property-disallowed-list @mixin transition($transition...) { @if length($transition) == 0 { $transition: $transition-base; } @if length($transition) > 1 { @each $value in $transition { @if $value == null or $value == none { @warn "The keyword 'none' or 'null' must be used as a single argument."; } } } @if $enable-transitions { @if nth($transition, 1) != null { transition: $transition; } @if $enable-prefers-reduced-motion-media-query and nth($transition, 1) != null and nth($transition, 1) != none { @media (prefers-reduced-motion: reduce) { transition: none; } } } }