hlf/gulpfile.js

const gulp = require('gulp'),
      sass = require('gulp-sass')(require('sass')),
      browserSync = require('browser-sync').create();

function mixin() {
  return gulp.src('./css/*.scss')
    .pipe(sass().on('error',sass.logError))
    .pipe(gulp.dest('./css/'))
    .pipe(browserSync.stream());
}

function run() {
  browserSync.init({
    server: {
      baseDir: "./",
      index: "/index.html"
    }
  });
  gulp.watch('./css/*.scss', mixin);
  gulp.watch([
    './*.html',
    './css/**/*.css',
    './js/**/*.js' 
  ]).on('change',browserSync.reload);
  console.log("🔥 Run");
}
exports.mixin = mixin;
exports.run = run;