gulpfile.js

var gulp = require('gulp');
var autoprefixer = require('gulp-autoprefixer');
var beeper = require('beeper');
var browserSync = require('browser-sync');
var cleanCSS = require('gulp-clean-css');
var notify = require('gulp-notify');
var plumber = require('gulp-plumber');
var rename = require("gulp-rename");
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var gutil = require('gulp-util');

//import required dependencies

var onError = function(err) {
  notify.onError({
    title: "Gulp error in " + err.plugin,
    message: err.toString()
  })(err);
  beeper(3);
  this.emit('end');
  gutil.log(gutil.colors.red(err));
};
//this block will give error in red fonts instade of stopping on error

gulp.task('styles', function() {
  gulp.src('assets/sass/style.sass')
    .pipe(plumber({ errorHandler: onError }))
    .pipe(sourcemaps.init())
    .pipe(sass({ indentedSyntax: true }))
    .pipe(autoprefixer({
      browsers: ['last 5 versions'],
      cascade: false
    }))
    .pipe(cleanCSS())
    .pipe(sourcemaps.write('.'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(gulp.dest('./assets/css'))
    .pipe(browserSync.reload({
      stream: true
    }));

});
//styles task to compile sass and build sass sourcemaps


gulp.task('default', function() {
  gulp.start('styles', 'watch');
});

gulp.task('watch', function() {
  gulp.watch('assets/sass/**/*', ['styles']);
  gulp.watch('assets/js/*.js', browserSync.reload);
  gulp.watch('assets/img/*.*', browserSync.reload);
  gulp.watch('./*.html', browserSync.reload);

  // init server
  browserSync.init({
    files: ['index.html', 'schedule.html'],
    server: {
      baseDir: "./"
    }
  });

});