Motion UI has six variables which store all of the library’s settings. Each is a map of keys and values.


$motion-ui-states: (
  in: 'enter',
  out: 'leave',

Motion UI defines two motion states: in and out, which create classes with the words enter and leave respectively.


$motion-ui-classes: (
  chain: true,
  prefix: 'mui-',
  active: '-active',

Different animation libraries have different ways of writing classes, but most libraries require a setup class, as well as an active class to trigger a transition or animation.

The default configuration outputs classes like this:

.fade-in.mui-enter {}
.fade-in.mui-enter.mui-enter-active {}

Set the chain property of $motion-ui-classes to false to create classes like this:

.fade-in-mui-enter {}
.fade-in-mui-enter.fade-in-mui-enter-active {}

The class output can also be fine-tuned with the prefix and active properties.

Animation Defaults

The maps $motion-ui-speeds, $motion-ui-delays, and $motion-ui-easings define terms for animation speeds, delays, and timing functions. For example, the default speed of animations is 500ms, while slow is 750ms, and fast is 250ms.

Other Settings

Miscellaneous settings are in the $motion-ui-settings map. These settings define if animations include a fade, and what class to use for triggering an animation queue.

$motion-ui-settings: (
  slide-and-fade: false,
  hinge-and-fade: true,
  scale-and-fade: true,
  spin-and-fade: true,
  activate-queue-class: 'is-animating'