custom-component-themes.scss

// import custom component themes
// unofficial naming convention to support nice ordering of files in IDE 
// to see theme under the original style file of the component
@import './app/shared/components/sidenav/sidenav.component.scss-theme.scss';
// you only have to add additional components here (instead of in every theme class)
@mixin custom-components-theme($theme) {
    @include sidenav-component-theme($theme);
}