gulp plumber

gulpfile.js

var gulp = require('gulp');
var sass = require('gulp-sass');
var browserify = require('gulp-browserify');
var livereload = require('gulp-livereload');
var plumber = require('gulp-plumber');
var tinylr = require('tiny-lr')();

var port = 35729;

gulp.task('watch', function() {
  gulp.watch('./styles/sass/*.scss', ['sass']);
  gulp.watch('./js/*.js', ['js']);
});

gulp.task('js', function() {
  gulp.src('./js/*.js')
    .pipe(plumber())
    .pipe(browserify())
    .pipe(gulp.dest('./build/'))
    .pipe(livereload(tinylr));
});

gulp.task('sass', function() {
  gulp.src('./styles/sass/*.scss')
    .pipe(plumber())
    .pipe(sass())
    .pipe(gulp.dest('./styles/css/'))
    .pipe(livereload(tinylr));
});

gulp.task('serve', function() {
  tinylr.listen(port, function() {
    console.log('... Listening on %s ...', port);
  });
});


gulp.task('build', ['js', 'sass'])

gulp.task('default', ['build', 'watch', 'serve']);