Sample Gulp Configuration

gulpfile.js

//declare gulp variables
var 	gulp 			= require('gulp'),
	gulpUtil 		= require('gulp-util'),
	concat 			= require('gulp-concat'),
	uglify 			= require('gulp-uglify'),
	jshint 			= require('gulp-jshint'),
	stylish 			= require('jshint-stylish'),
	autoprefixer	= require("gulp-autoprefixer"),
	sass			= require('gulp-ruby-sass'),
	imagemin		= require('gulp-imagemin'),
	notify 			= require("gulp-notify"),
	browserSync	= require('browser-sync');
	watch 			= require('gulp-watch');

//declare paths to be used for concatonated files
var paths = {
	scss:  			['./assets/stylesheets/scss/*.scss'],
	css: 			['./app/css/*.css'],
	scripts: 		['./assets/scripts/js/*.js'],
	images: 		 './assets/images/*',
	html:			 './app/*.html'
};

//lint javascript
gulp.task('lint', function(){	
	 gulp.src( paths.scripts )
	 	.pipe(jshint())
    		.pipe(jshint.reporter(stylish))
});

//minify and concatonate javascript
gulp.task('scripts', function(){	
	 gulp.src( paths.scripts )
    		.pipe(concat('script.min.js'))
    		.pipe(uglify())
		.pipe(gulp.dest('./app/scripts'))
});

//minify and concatonate sass files
gulp.task('sass', function () {
	gulp.src(paths.scss)
		.pipe(sass({sourcemap: true, style:"nested"}))
		.pipe(autoprefixer('last 2 version', 'safari 5', 'ie 9', 'ie 8', 'opera 12.1', 'ios 6', 'android 4'))
		.pipe(gulp.dest('./app/css'))
});

// optimize all static images and move to a 'min' directory
gulp.task('images', function() {
  	gulp.src(paths.images)
    		.pipe(imagemin({optimizationLevel: 5}))
    		.pipe(gulp.dest('./app/images'))
});

//declare the source for the html files
gulp.task('html', function(){
	gulp.src(paths.html)
});

gulp.task('browser-sync', function() {
    browserSync.init([paths.html, paths.css], {        // files to inject
        server: {
    		baseDir: "app"
	}
    });
});

// Rerun the task when a file changes
gulp.task('watch', function () {
	gulp.watch( paths.stylesheets, 	['sass']);
	gulp.watch( paths.scripts, 		['scripts']);
	gulp.watch( paths.images, 		['images']);
	gulp.watch( paths.html, 		['html']);
});

// development tasks
gulp.task('dev', ['lint','scripts','sass','browser-sync','watch']);

// build tasks 
gulp.task('build', ['scripts','sass','images']);

// default task (called when you run `gulp` from cli)
gulp.task('default', ['dev']);

package.json

{
  "name": "",
  "version": "0.0.1",
  "author": "",
  "homepage": "",
  "repository": {
    "type": "git",
    "url": ""
  },
  "devDependencies": {
    "gulp": "~3.5.2",
    "gulp-util": "~2.2.14",
    "gulp-concat": "~2.1.7",
    "gulp-uglify": "~0.2.1",
    "gulp-watch": "~0.5.0",
    "gulp-imagemin": "~0.1.5",
    "gulp-ruby-sass": "~0.3.0",
    "gulp-jshint": "~1.4.2",
    "gulp-markdown": "~0.1.2",
    "gulp-notify": "~0.5.0",
    "jshint-stylish": "~0.1.5",
    "gulp-autoprefixer": "0.0.6",
    "browser-sync": "~0.5.7"
  },
  "dependencies": {
  }
}