Keyframes mixin for SASS

1-mixins.sass

=keyframes($name)
  @-webkit-keyframes #{$name}
    @content
  @-moz-keyframes #{$name}
    @content
  @-ms-keyframes #{$name}
    @content
  @keyframes #{$name}
    @content

=vendor($property, $value)
  -webkit-#{$property}: $value
  -moz-#{$property}: $value
  -o-#{$property}: $value
  #{$property}: $value

=animation-name($name)
  +vendor(animation-name, $name)

=animation-duration($duration)
  +vendor(animation-duration, $duration)

=animation-fill-mode($mode)
  +vendor(fill-mode, $mode)

2-define-it.sass

+keyframes(fadeIn)
  0%
    +opacity(0)
    +scale(.9, .9)
  100%
    +opacity(1)
    +scale(1, 1)

3-use-it.sass

.my-selector  
  +animation-name(fadeIn)
  +animation-duration(1s)