Conceptual ideas for disallowed use of the SASS import directive. Throws errors: Import directives may not be used within control directives or mixins Refer to: http://sass-lang.com/documentation/file.SASS_REFERENCE.html#import

namespace-an-application.scss

@mixin App(
  // usual config.scss stuff with set !default values
){
  @import 'base';
  @import 'ui.type';
  @import 'ui.buttons';
  // ...
}

// Init
@include App;

using-the-import-directive-for-theming.scss

@mixin Theme (
	$theme: 'classic'
) {
	@if ($theme == 'classic') {
		@import 'theme-a';
	}
	@else {
		@import 'theme-b';	
	}
}

@include Theme();