pipe-clone.js

gulp.task('scss', function() {
    var source =  gulp.src('sources/sass/theme.scss')
        .pipe(plumber())
        .pipe(sourcemaps.init())
        .pipe(sass());

    var pipe1 = source.pipe(clone())
        .pipe(sourcemaps.write('.'))
        // .pipe(rename('custom-editor-style.css'))
        .pipe(gulp.dest('css'))

    var pipe2 = source.pipe(clone())
        .pipe(cssnano())
        .pipe(rename({suffix: '.min'}))
        .pipe(gulp.dest('css'));

    return merge(pipe1, pipe2);
});