material-web/motion/_animation.scss

//
// Copyright 2021 Google LLC
// SPDX-License-Identifier: Apache-2.0
//

$standard-easing: cubic-bezier(0.4, 0, 0.2, 1);
$acceleration-easing: cubic-bezier(0.4, 0, 1, 1);
$deceleration-easing: cubic-bezier(0, 0, 0.2, 1);
$sharp-easing: cubic-bezier(0.4, 0, 0.6, 1);

@function standard($name, $duration, $delay: null) {
  @return _animation($name, $duration, $standard-easing, $delay);
}

@function acceleration($name, $duration, $delay: null) {
  @return _animation($name, $duration, $acceleration-easing, $delay);
}

@function deceleration($name, $duration, $delay: null) {
  @return _animation($name, $duration, $deceleration-easing, $delay);
}

@function sharp($name, $duration, $delay: null) {
  @return _animation($name, $duration, $sharp-easing, $delay);
}

@function _animation($name, $duration, $easing, $delay) {
  @if $delay {
    @return $name $duration $easing $delay;
  }

  @return $name $duration $easing;
}