Gulpfile for compiling SCSS to CSS

gulpfile.js

const gulp = require('gulp'),
    fs = require('fs'),
    sass = require('gulp-sass')(require('sass')),
    { watch, series } = require('gulp')

function clean() {
    return new Promise((resolve, reject) => {
            fs.unlink('./public/style.css', function (err) {
                if (err) throw err;
                // if no error, file has been deleted successfully
                console.log('css file deleted!');
                resolve();
            });
        }
    )
}
  
// compile scss
function styles() {
    return gulp.src('./public/*.scss')
    .pipe(sass().on('error', sass.logError))
    .pipe(gulp.dest('./public/')) 
}


exports.default = () => {
    watch('./public/*.scss', styles)
}

exports.build = series(clean, styles)