$heights: (
  '-25': 25%,
  '-50': 50%,
  '-75': 75%,
  '-100': 100%,
  '-v25': 25vh,
  '-v50': 50vh,
  '-v75': 75vh,
  '-v100': 100vh,
  '-auto': auto,
  '-inherit': inherit,
);

@include generateFromMap(
  $map: $linear-scale,
  $append-map: $heights,
  $selector-prefix: 'h',
  $properties: height
);