/// Spacing Stack
/// Get the Stack spacing of the map
/// @group Spacing
/// @param {string} $key
@function get-spacing-stack($key) {
  @if map-has-key($spacingStack, $key) {
    @return map-get($spacingStack, $key);
  }

  @warn "The key #{$key} is not in the map ’$spacingStack’";
  @return null;
}