Gulp.js: Difference between revisions

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{{Short description|Server-side JavaScript build tool}}

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{{How -to|date=October 2016}}

{{context|date=January 2017}}

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{{Infobox Softwaresoftware

| logoname = Gulp.js Logo.svg = gulp

| logo size = 100pxGulp.js Logo.svg

| developerlogo caption = Fractal and contributors of the GitHub= community

| logo alt =

| latest release version = 4.0.0

| logo size = 100px

| latest_release_date = {{Start date and age|2017|12|31|df=yes}}<ref name="previous-releases">{{cite web | url=https://github.com/gulpjs/gulp/blob/master/CHANGELOG.md | accessdate=2018-01-11 | title=gulp changelog}}</ref>

| collapsible =

| language = [[JavaScript]]

| screenshot = <!-- Image name is enough -->

| genre = [[Toolkit]]

| platformscreenshot size = [[Cross-platform]]

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| license = [[MIT License]]<ref>{{cite web|url=https://github.com/gulpjs/gulp/blob/master/LICENSE|title=License to github.com | language=en | accessdate = 2016-05-30}}</ref>

| caption =

|name=gulp}}

| other_names =

'''gulp'''| author is an [[Open-source software|open-source]] [[JavaScript]] toolkit by Fractal Innovations = Eric Schoffstall<ref name=":0">{{Cite book|title=Developing a Gulp Edge|publisher=Bleeding Edge Press|year=2014|isbn=978-1-939902-14-6|edition=1st|___location=|pages=|via=|author1=Jed Mao |author2=Maximilian Schmitt |author3=Tomasz Stryjewski |author4=Cary Country Holt |author5=William Lubelski }}</ref> and the open source community at [[GitHub]], used as a streaming [[build system]] in [[front-end web development]].

| developer = Blaine Bublitz, Eric Schoffstall

| released = {{Start date and age|2013|09|26|df=yes}}<ref>{{cite web | url=https://libraries.io/npm/gulp/versions | access-date=2020-12-31 | title=Release Date of Version 1.0.0}}</ref><!-- As per template guideline, this is the release date of version 1.0.0 -->

| ver layout =

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| latest release version = 45.0.0

| latest_release_date = {{Start date and age|20172024|1203|3129|df=yes}}<ref name="previouslatest-releases">{{cite web | url=https://github.com/gulpjs/gulp/blob/master/CHANGELOG.md releases | accessdateaccess-date=20182020-0112-1131 | title=Releases · gulpjs/gulp| website=[[GitHub]] changelog}}</ref>

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| repo = {{URL|https://github.com/gulpjs/gulp}}

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| programming language = [[JavaScript]] <!-- Node.js is NOT a language, it is a platform -->

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| operating system = [[Linux]], [[macOS]], [[Windows]] <!-- As per template guideline, do not write "Cross-platform" here -->

| platform = [[Node.js]] <!-- As per template guideline, do not write "Cross-platform" here -->

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| genre = [[Toolkit]]

| license = [[MIT License]]<ref>{{cite web | url=https://github.com/gulpjs/gulp/blob/master/LICENSE | title=LicenseLICENSE tofile github.comon GitHub | languagewebsite=en[[GitHub]] | accessdateaccess-date=2020-12-31}}</ref><ref>{{cite web | url=https://www.npmjs.com/package/gulp 2016| title=License field from gulp - npm | access-date=2020-0512-3031}}</ref>

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'''gulp''' is an [[Open-source software|open-source]] [[JavaScript]] toolkit, used as a streaming [[build system]] (similar to a more package-focused [[Make (software)|Make]]) in [[front-end web development]].

It is a task runner built on [[Node.js]] and [[npm (software)|npm]], used for automation of time-consuming and repetitive tasks involved in web development like [[Minification (programming)|minification]], concatenation, cache busting, [[unit testing]], [[Linting software|linting]], optimization, etc.<ref>{{cite web|url=https://www.smashingmagazine.com/2014/06/building-with-gulp/ |title=Building With Gulp – Smashing Magazine |website=Smashingmagazine.com |date=11 June 2014 |accessdateaccess-date=2016-12-14}}</ref>

gulp uses a code-over-configuration approach to define its tasks and relies on its small, single-purposedpurpose plugins to carry them out. The gulp ecosystem includes more than 3003500 such plugins.<ref>{{cite web|url=https://gulpjs.com/plugins/ |title=gulp.js plugin registry |website=Gulpjs.com |access-date= |accessdate=2016-12-14}}</ref>

== Overview ==

gulp<ref>{{cite web|url=https://github.com/gulpjs/gulp/blob/master/docs/FAQ.md|title=gulpjs/gulp|website=GitHub|access-date=2016-09-22}}</ref> is a build tool in JavaScript built on [[node stream]]s. These streams facilitate the connection of file operations through [[Pipeline (software)|pipelines]].<ref name="github.com">{{cite web|url=https://github.com/substack/stream-handbook |title=substack/stream-handbook: how to write node programs with streams |publisher=GitHub |access-date= |accessdate=2016-12-14}}</ref> gulp reads the file system and pipes the data at hand from its one single-purposed plugin to otheranother through the <code>.pipe()</code> operator, doing one task at a time. The original files are not affected until all the plugins are processed. It can be configured either to modify the original files or to create new ones. This grants the ability to perform complex tasks through linking its numerous plugins. The users can also write their own plugins to define their own tasks.<ref>{{cite web|url=https://github.com/gulpjs/gulp/blob/master/docs/writing-a-plugin/README.md|title=gulpjs/gulp|website=GitHub|access-date=2016-09-22}}</ref> Unlike other task runners that run tasks by configuration, gulp requires knowledge of JavaScript and coding to define its tasks. gulp is a build system which means apart from running tasks, it is also capable of copying files from one ___location to another, [[compiling]], [[Software deployment|deploying]], creating notifications, unit testing, linting, etc.<ref name=":0" />

== Need for a task runner ==

Task-runners like gulp and [[Grunt (software)|Grunt]] are built on Node.js rather than [[Node Package Manager|npm]], because the basic npm scripts are inefficient when executing multiple tasks.

Even though some developers prefer [[Node Package Manager|npm]] scripts because they can be simple and easy to implement, there are numerous ways where gulp and Grunt seem to have an advantage over each other, and the default provided scripts.<ref name="gulpjs/gulp">{{cite web|url=https://github.com/gulpjs/gulp/blob/master/docs/CLI.md|title=gulpjs/gulp|website=GitHub|access-date=2016-09-23}}</ref> Grunt runs tasks by transforming files and saves them as new ones in temporary folders, and the output of one task is taken as input for another and so on until the output reaches the destination folder. This involves a lot of [[I/O]] calls and the creation of many temporary files. Whereas gulp streams through the file system and doesdo not require any of these temporary locations, decreasing the number of I/O calls thus, improving performance.<ref>{{cite web|url=https://css-tricks.com/gulp-for-beginners/ |title=Gulp for Beginners |publisher=CSS-Tricks |date=2015-09-01 |accessdateaccess-date=2016-12-14}}</ref> Grunt uses configuration files to perform tasks, whereas gulp requires its build file to be coded. In Grunt, each plugin needs to be configured to match its input ___location to the previous plugin’splugin's output. In gulp, the plugins are automatically pipe-lined.<ref name="github.com"/>

== Operation ==

The gulp tasks are run from a [[Commandcommand-line interface|Command Line Interface]] (CLI)]]<ref name="gulpjs/gulp"/> shell and require two files, <code>package.json</code>, which is used to list the various plugins for gulp, and <code>gulpfile.js</code> (or simply <code>gulpfile</code>), These, as per build tool convention, are often found in the project root directory of the package's source code. The gulpfile iscontains wheremost pluginsof arethe loadedlogic andthat tasksgulp areneeds definedto run its build tasks. First, all the necessary modules are loaded and then tasks are defined in the gulpfile. All the necessary plugins specified in the gulpfile are installedlisted intoin the devDependencies section of <code>package.json</code>.<ref name=":2">{{cite web|url=https://docs.npmjs.com/cli/install|title=install {{!}} npm Documentation|website=docs.npmjs.com|access-date=2016-09-22}}</ref> The default task runs by <code>$gulp</code>. Individual tasks can be defined by gulp.task and are run by <code>gulp <task> <othertask></code>.<ref name=":1">{{cite web|url=https://github.com/gulpjs/gulp/blob/master/docs/getting-started.md|title=gulpjs/gulp|website=GitHub|access-date=2016-09-23}}</ref> Complex tasks are defined by chaining the plugins with the help of <code>.pipe()</code> operator.<ref name=":3" />

== Anatomy of gulpfile ==

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Any installed plugin that is required to perform a task is to be added at the top of the gulpfile as a dependency in the following format.<ref name=":1" /><ref name=":3" /> <syntaxhighlight lang="javascript">

//Adding dependencies

var gulp = require ( 'gulp');

var gutil = require ( 'util-gulp');

</syntaxhighlight>

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The tasks can then be created. A gulp task is defined by ''gulp.task'' and takes the name of the task as the first parameter and a function as the second parameter.

The following example shows the creation of a gulp tasks. The first parameter '' taskName '' is mandatory and specifies the name by which the task in the shell can be executed.<ref>{{cite web|url=https://github.com/gulpjs/gulp/blob/4.0/docs/API.md |title=gulp/API.md at 4.0 · gulpjs/gulp · GitHub |publisher=GitHub |date=2016-05-12 |accessdateaccess-date=2016-12-14}}</ref> <syntaxhighlight lang="javascript">

gulp.task ( 'taskName', function () {

//Defining tasks

//do something

gulp.task ( 'taskName', function () {

//do something

});

</syntaxhighlight>

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Alternatively, a task that performs several predefined functions can be created. Those functions are passed as the second parameter in the form of an array. <syntaxhighlight lang="javascript">

function fn1 () {

// do something

}

function fn2 () {

// Dodo something else

}

// Task with array of function names

gulp.task ( 'taskName', ['gulp.parallel(fn1',' fn2']));

</syntaxhighlight>

=== Default task ===

The default task is to be defined at the end of the gulpfile. It can be run by the <code>gulp</code> command in the shell. In the case below, the default task does nothing.<ref name=":3" /> <syntaxhighlight lang ="javascript">

// Gulp default task

gulp.task ( 'default', [ '']fn);

</syntaxhighlight>The default task is used in gulp to run any number of dependent sub tasks defined above in a sequential order automatically. gulp can also monitor source files and run an appropriate task when changes are made to the files. The sub tasks are to be mentioned as the elements of the array in the second parameter. The process can be triggered by simply running the default task by <code>gulp</code> command.<ref name="sitepoint.com"/>

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=== Image Task ===

Subsequently, theThe module mustdefinition can be at the beginning of ''<code>Gulpfile.js</code> gulpfilelike 'defined' asso: ''<syntaxhighlight lang= "javascript">

For the following example, the '' [https://www.npmjs.com/package/gulp-imagemin gulp-imagemin] plugin'' is required. To install the plugin, run the command <code> npm install --save-dev gulp-imagemin</code>.<ref>{{cite web|url=https://www.npmjs.com/package/gulp-imagemin |title=gulp-imagemin |website=Npmjs.com |date= |accessdate=2016-12-14}}</ref>

var gutilimagemin = require ( 'utilgulp-gulpimagemin');

Subsequently, the module must be at the beginning of '' gulpfile 'defined' as: ''<syntaxhighlight lang= "javascript">

var imagemin = require ( 'gulp-imagemin');

</syntaxhighlight>

The subsequent image task optimizes images. <Code> gulp.src () </code> retrieves all the images with the extension .png, .gif or .jpg in the directory '' <nowiki/> 'images-orig/'.''

''<nowiki/>'' <Code> .pipe (imagemin ()) </Code> channels the images found, through the optimization process and with <code> .pipe (gulp.dest ()) </code> the optimized images are saved to the ''<nowiki/> 'images/' folder<nowiki/>''. Without <code> gulp.dest () </code> the images would indeed be optimized, but are not stored.<ref>{{cite web |url=http://magazin.phlow.de/webdesign/gulp/ |title=Durchstarten mit Gulp.js – Websites optimieren, Arbeitsabläufe automatisieren |website=Magazin.phlow.de |date=2014-05-25 |accessdateaccess-date=2016-12-14 |archive-date=2017-06-16 |archive-url=https://web.archive.org/web/20170616233539/http://magazin.phlow.de/webdesign/gulp/ |url-status=dead }}</ref> Since the optimized images are stored to another folder, the original images remain unaltered.<ref name=":3">{{Cite book|title=Getting Started with Gulp|last=Maynard|first=Travis|publisher=Packt Publishing Ltd|year=2015|isbn=9781784393472|___location=|pages=|via=}}</ref> <syntaxhighlight lang = "javascript">

// Images task

gulp.task ( 'images', function () {

return gulp.src ( 'images-orig/*. {png, gif, jpg}')

.pipe (imagemin ())

.pipe (gulp.dest ( 'dist/images/'));

});

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=== Scripts Task ===

In the following example, all JavaScript files from the directory '' <nowiki/> 'scripts/' <nowiki/> '' are optimized with <code> .pipe (uglify ()) </code> and <code> gulp. dest ( 'scripts/') </code> overwrites the original files with the output.<ref>{{cite web|url=https://liechtenecker.at/front-end-workflow-mit-gulp/ |title=Front-end Workflow mit Gulp - Liechtenecker |website=Liechtenecker.at |date=2015-05-29 |accessdateaccess-date=2016-12-14}}</ref> For this, one must first return to the required '' gulp-uglify plugin ''<ref>{{cite web|url=https://www.npmjs.com/package/gulp-uglify |title=gulp-uglify |website=Npmjs.com |access-date= |accessdate=2016-12-14}}</ref> on '' npm '' package installer and at the beginning of ''gulpfile'', the module should be defined. <syntaxhighlight lang = "javascript">

// Script task

gulp.task ( 'scripts', function () {

return gulp.src ( 'scripts/*. js')

.pipe (uglify ())

.pipe (gulp.dest ( 'scripts/'));

});

</syntaxhighlight>

=== Watch Task ===

The Watch-task serves to react to changes in files. In the following example, the tasks with the names ''scripts '' and '' images '' are called when any of JavaScript files or images change in the specified directories.<ref>{{cite web|url=https://www.npmjs.com/package/gulp-watch|title=gulp-watch|website=Npmjs.com|access-date=2016-09-23}}</ref> <syntaxhighlight lang = "javascript">

// Rerun the task When a file changes

gulp.task ( 'watch', function (cb) {

gulp.watch ( '. scripts/js /**', [ 'scripts']);

gulp.watch ( 'images-orig/**', [ 'images']);

cb();

});

</syntaxhighlight>

Furthermore, it is possible to accomplish an update of the browser content using the Watch-tasks.<ref>{{cite web|url=https://www.browsersync.io/docs/gulp/ |title=Browsersync + Gulp.js |website=Browsersync.io |access-date= |accessdate=2016-12-14}}</ref> For this, there are numerous options and plugins.

==See also==

* [[Grunt (software)]]

* [[Browserify]]

==References==

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==Literature==

*{{Cite book|title=Developing a Gulp Edge|publisher=Bleeding Edge Press|year=2014|isbn=978-1-939902-14-6|edition=1st|___location=|pages=|via=|author1=Jed Mao |author2=Maximilian Schmitt |author3=Tomasz Stryjewski |author4=Cary Country Holt |author5=William Lubelski }}

*{{Cite book| author=Den Odell | title=Pro JavaScript Development Coding, Capabilities, and Tooling | publisher=Apress |year=2014 |chapter=Build Tools and Automation |isbn=978-1-4302-6268-8}}

*{{Cite book|title=Getting Started with Gulp|last=Maynard|first=Travis|publisher=Packt Publishing Ltd|year=2015|isbn=9781784393472|___location=|pages=|via=}}

== External links ==