@mixin clearfix {}
@mixin clearfix{}
@mixin  clearfix  {}
@mixin clearfix
  {}
@mixin
  clearfix
  {}
@mixin
clearfix
{
}
@mixin

clearfix

{

}

@mixin mix($arg, $arg1, $arg2: 10, $args...) {}
@mixin mix($arg,$arg1,$arg2:10,$args...){}
@mixin mix ( $arg , $arg1 , $arg2 : 10 , $args ... ) {}
@mixin  mix  (  $arg  ,  $arg1  ,  $arg2  :  10  ,  $args  ...  )  {}
@mixin mix(
    $arg,
    $arg1,
    $arg2: 10,
    $args...
) {}
@mixin
mix(
    $arg,
    $arg1,
    $arg2: 10,
    $args...
    ) {}
@mixin
mix
(
$arg
,
$arg1
,
$arg2
:
10
,
$args
...
)
{
}
@mixin

mix

(

$arg

,

$arg1

,

$arg2

:

10

,

$args

...

)

{
}
@mixin mix($very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-arg, $very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-arg1, $very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-arg2: 10, $very-very-very-very-very-very-very-very-very-very-very-very-very-very-long-args...) {}
@mixin component($conf: ()) {}
@mixin component($conf: ( )) {}
@mixin button-variant($hover-background: darken($background, 7.5%)) {}
@mixin button-variant( $hover-background : darken( $background , 7.5% ) ) {}
@mixin button-variant($hover-background:darken($background,7.5%)) {}
@mixin button-variant(
    $hover-background: darken($background, 7.5%)
) {}
@mixin
button-variant(
$hover-background
:
darken(
$background
,
7.5%
)
)
{}
@mixin button-variant($foo: "...") {}
@mixin button-variant($foo: " ... ") {}
@mixin button-variant($foo: "  ...  ") {}
@mixin sexy-border($color, $width, $foo: (color: red)) {}

@mixin selector($param: "value") {}