gulp.task('sass', () => {
const sourceFolder = path.join('.', 'Content', 'scss', 'main.scss');
const distFolder = path.join('.', 'wwwroot', 'css');
return gulp.src(sourceFolder)
    .pipe(sass({
        sourceMap: true,
        style: 'compressed'
    }))
    .pipe(cleanCSS({
        compatibility: 'ie8'
    }))
    .pipe(sourcemaps.write('.'))
    .pipe(gulp.dest(distFolder))
    .on('end', () => console.log(`[${new Date().toLocaleTimeString()}] -> sass compilation complete...`));