• Gulp on its own doesn’t do a lot. We need to install plugins and add tasks to the gulpfile to put Gulp into action.
• Take 3 specific javascript files, concatenate them, then save the result to a file (concat.js)
• Take this concatenated file and uglify/minify it, then save the result to another file (uglify.js)

learn gulp tutorial - gulp concateneting files - gulp example

Below is the code that we used in the gulpfile.js

var csso = require('gulp-csso');
var concat = require('gulp-concat');
var jsmin = require('gulp-jsmin');

gulp.task('default', ['move_css', 'compile_js']);

gulp.task('move_css', function(){
	gulp.watch("./*.css", function(){
		gulp.src("./*.css").pipe(csso()).pipe(gulp.dest("css"));
		console.log("Minified and Moved CSS");
	});
});

gulp.task('compile_js', function(){
	gulp.watch("./scripts/*.js", function(){
		gulp.src('./scripts/*.js')
			.pipe(jsmin())
			.pipe(concat('scripts.js'))
			.pipe(gulp.dest('js'));

		console.log("JS Compiled");
	});

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var csso = require('gulp-csso');
var concat = require('gulp-concat');
var jsmin = require('gulp-jsmin');

gulp.task('default', ['move_css', 'compile_js']);

gulp.task('move_css', function(){
	gulp.watch("./*.css", function(){
		gulp.src("./*.css").pipe(csso()).pipe(gulp.dest("css"));
		console.log("Minified and Moved CSS");
	});
});

gulp.task('compile_js', function(){
	gulp.watch("./scripts/*.js", function(){
		gulp.src('./scripts/*.js')
			.pipe(jsmin())
			.pipe(concat('scripts.js'))
			.pipe(gulp.dest('js'));

		console.log("JS Compiled");
	});

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• However, the uglify operation doesn't seem to be working, or the file isn't generated for some reason.
• Another way:
• To concatenate files we’ll need the gulp-concat plugin; to install it run this from the command line:-

var csso = require('gulp-csso');
var concat = require('gulp-concat');
var jsmin = require('gulp-jsmin');

gulp.task('default', ['move_css', 'compile_js']);

gulp.task('move_css', function(){
	gulp.watch("./*.css", function(){
		gulp.src("./*.css").pipe(csso()).pipe(gulp.dest("css"));
		console.log("Minified and Moved CSS");
	});
});

gulp.task('compile_js', function(){
	gulp.watch("./scripts/*.js", function(){
		gulp.src('./scripts/*.js')
			.pipe(jsmin())
			.pipe(concat('scripts.js'))
			.pipe(gulp.dest('js'));

		consnpm install gulp-concat --save-dev
ole.log("JS Compiled");
	});

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• Again, if you check your package.json file you should see a new line referencing the newly installed plugin:-

"gulp-concat": "~2.1.7"

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• Now we need to add a task to the gulpfile that will instruct Gulp to concatenate some files. Let’s concatenate the project’s JavaScript files:-

// Include gulp
	var gulp = require('gulp');
	
	// Include plugins
	var concat = require('gulp-concat');

	// Concatenate JS Files
	gulp.task('scripts', function() {
                       return gulp.src('src/js/*.js')
                       .pipe(concat('main.js'))
                       .pipe(gulp.dest('build/js'));
	});

	// Default Task
	gulp.task('default', ['scripts']);

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• What’s happening here is we’re including the gulp-concat plugin and naming it with the variable concat. We then define the task using gulp.task, naming it ‘scripts’.
• The task involves three processes:-
• We grab the files we want to concatenate using gulp.src (any file with the extension .js in the directory src/js/.
• We then concatenate these files as main.js.
• Finally we tell Gulp where to put main.js, in this case the directory build/js.
• The default task tells Gulp what tasks to call when it’s run, for now that’s just the scripts task. To run Gulp just run:-

gulp

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• Hopefully if everything’s gone right main.js will have been created in build/js and will be a concatenation of all the JS files.
• If you need to concatenate files in a particular order, then you can always pass an array to gulp.src. For example:-

gulp.src(['src/js/plugins/*.js', 'src/js/main.js'])

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gulp.src(['src/js/plugins/*.js', 'src/js/main.js'])

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