index.js
function(paths) {
    return (
        gulp
        .src(paths.src.path)
        .pipe(rework(
            reworkUrl(function (url) {
                return isRelative(url) ? path.basename(url) : url;
            })
        ))
        .pipe($.if(config.sourcemaps, $.sourcemaps.init({ loadMaps: true })))
        .pipe($.concat(paths.changeExtension(paths.output.name, '.css')))
        .pipe($.if(config.production, $.cssnano(config.css.cssnano.pluginOptions)))
        .pipe($.if(config.sourcemaps, $.sourcemaps.write('.')))
        .pipe(gulp.dest(paths.output.baseDir))
    );
}
function(paths) {
    return (
        gulp
        .src(paths.src.path)
        .pipe(rework(
            reworkUrl(function (url) {
                return isRelative(url) ? path.basename(url) : url;
            })
        ))
        .pipe($.if(config.sourcemaps, $.sourcemaps.init({ loadMaps: true })))
        .pipe($.concat(paths.changeExtension(paths.output.name, '.css')))
        .pipe($.if(config.production, $.cssnano(config.css.cssnano.pluginOptions)))
        .pipe($.if(config.sourcemaps, $.sourcemaps.write('.')))
        .pipe(gulp.dest(paths.output.baseDir))
    );
}
function ( paths ) { return ( gulp . src ( paths . src . path ) . pipe ( rework ( reworkUrl ( function ( url ) { return isRelative ( url ) ? path . basename ( url ) : url ; } ) ) ) . pipe ( $ . if ( config . sourcemaps , $ . sourcemaps . init ( { loadMaps : true } ) ) ) . pipe ( $ . concat ( paths . changeExtension ( paths . output . name , '.css' ) ) ) . pipe ( $ . if ( config . production , $ . cssnano ( config . css . cssnano . pluginOptions ) ) ) . pipe ( $ . if ( config . sourcemaps , $ . sourcemaps . write ( '.' ) ) ) . pipe ( gulp . dest ( paths . output . baseDir ) ) ) ; }
Combine stylesheets.

@param  {GulpPaths} paths
@return {stream}
Combine stylesheets .