Sharing my gulpfile

gulpfile.js

// npm install --save-dev gulp gulp-sass gulp-autoprefixer gulp-minify-css gulp-notify gulp-jshint gulp-concat gulp-rename gulp-uglify gulp-livereload gulp-imagemin gulp-cache 
var gulp = require('gulp'),
    sass = require('gulp-sass'),
    prefix = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    notify = require('gulp-notify'),
    jshint = require('gulp-jshint'),
    concat = require('gulp-concat'),
    rename = require('gulp-rename'),
    uglify = require('gulp-uglify'),
    livereload = require('gulp-livereload'),
    imagemin = require('gulp-imagemin'),
    cache = require('gulp-cache');

// Styles
gulp.task('styles', function() {
    gulp.src('./src/styles/**/*.scss')
        .pipe(sass({
            outputStyle: 'expanded'
        }))
        .pipe(prefix(
            "last 1 version", "> 1%", "ie 8", "ie 7"
        ))
        .pipe(minifycss())
        .pipe(gulp.dest('./assets/css'))
        .pipe(notify({
            message: 'Styles task complete'
        }));
});

// Js hint
gulp.task('jshint', function() {
    gulp.src(['./src/scripts/**/*.js', '!./src/scripts/vendor/**/*.js'])
        .pipe(jshint())
        .pipe(jshint.reporter('jshint-stylish'))
        .pipe(notify({
            message: 'Jshint task complete'
        }));
})

// Minify Scripts
gulp.task('scripts', ['jshint'], function() {
    return gulp.src('./src/scripts/**/*.js')
        .pipe(concat('main.js'))
        .pipe(rename({
            suffix: '.min'
        }))
        .pipe(uglify())
        .pipe(gulp.dest('./assets/js'))
        .pipe(notify({
            message: 'Scripts task complete'
        }));
});

// Images
gulp.task('images', function() {
    return gulp.src('./src/images/**/*')
        .pipe(cache(imagemin()))
        .pipe(gulp.dest('./assets/img'))
        .pipe(notify({
            message: 'Images task complete'
        }));
});

// Default task
gulp.task('default', function() {
    gulp.run('styles', 'scripts', 'images');
});

// Watch
gulp.task('watch', function() {

    livereload.listen();

    // Watch .scss files
    gulp.watch('./src/styles/**/*.scss', ['styles']).on('change', livereload.changed);

    // Watch .js files
    gulp.watch('./src/scripts/**/*.js', ['scripts']).on('change', livereload.changed);

    // Watch image files
    gulp.watch('./src/images/**/*', ['images']).on('change', livereload.changed);
});