How to update a global variable from mixin or function?

[hittas]

For example:

$flex-legacy: ();

@mixin my-flex($param) {
    @if $flex-support == false {
        $flex-legacy: map_merge($flex-legacy, (nth(&, 1): $param)); // need global
    } @else {
        @include flexbox($params, $version: 3); // mixin from compass
    }
}

#container {
    @include my-flex((display: flex));
}

@debug $flex-legacy; // now empty but I need (#container: (display: flex))

[nex3]

Use the !global flag:

$flex-legacy: ();

@mixin my-flex($param) {
    @if $flex-support == false {
        $flex-legacy: map_merge($flex-legacy, (nth(&, 1): $param)) !global; // need global
    } @else {
        @include flexbox($params, $version: 3); // mixin from compass
    }
}

[hittas]

Indeed, thanks! It's my fault :)