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gulp

4.0.2 • Public • Published 21 days ago

The streaming build system

What is gulp?

Automation - gulp is a toolkit that helps you automate painful or time-consuming tasks in your development workflow.
Platform-agnostic - Integrations are built into all major IDEs and people are using gulp with PHP, .NET, Node.js, Java, and other platforms.
Strong Ecosystem - Use npm modules to do anything you want + over 2000 curated plugins for streaming file transformations
Simple - By providing only a minimal API surface, gulp is easy to learn and simple to use

What's new in 4.0?!

The task system was rewritten from the ground-up, allowing task composition using series() and parallel() methods
The watcher was updated, now using chokidar (no more need for gulp-watch!), with feature parity to our task system
First-class support was added for incremental builds using lastRun()
A symlink() method was exposed to create symlinks instead of copying files
Built-in support for sourcemaps was added - the gulp-sourcemaps plugin is no longer necessary!
Task registration of exported functions - using node or ES exports - is now recommended
Custom registries were designed, allowing for shared tasks or augmented functionality
Stream implementations were improved, allowing for better conditional and phased builds

Installation

Follow our Quick Start guide.

Roadmap

Find out about all our work-in-progress and outstanding issues at https://github.com/orgs/gulpjs/projects.

Documentation

Check out the Getting Started guide and API docs on our website!

Excuse our dust! All other docs will be behind until we get everything updated. Please open an issue if something isn't working.

Sample `gulpfile.js`

This file will give you a taste of what gulp does.

var gulp = require('gulp');
var less = require('gulp-less');
var babel = require('gulp-babel');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');
var cleanCSS = require('gulp-clean-css');
var del = require('del');
 
var paths = {
  styles: {
    src: 'src/styles/**/*.less',
    dest: 'assets/styles/'
  },
  scripts: {
    src: 'src/scripts/**/*.js',
    dest: 'assets/scripts/'
  }
};
 
/* Not all tasks need to use streams, a gulpfile is just another node program
 * and you can use all packages available on npm, but it must return either a
 * Promise, a Stream or take a callback and call it
 */
function clean() {
  // You can use multiple globbing patterns as you would with `gulp.src`,
  // for example if you are using del 2.0 or above, return its promise
  return del([ 'assets' ]);
}
 
/*
 * Define our tasks using plain functions
 */
function styles() {
  return gulp.src(paths.styles.src)
    .pipe(less())
    .pipe(cleanCSS())
    // pass in options to the stream
    .pipe(rename({
      basename: 'main',
      suffix: '.min'
    }))
    .pipe(gulp.dest(paths.styles.dest));
}
 
function scripts() {
  return gulp.src(paths.scripts.src, { sourcemaps: true })
    .pipe(babel())
    .pipe(uglify())
    .pipe(concat('main.min.js'))
    .pipe(gulp.dest(paths.scripts.dest));
}
 
function watch() {
  gulp.watch(paths.scripts.src, scripts);
  gulp.watch(paths.styles.src, styles);
}
 
/*
 * Specify if tasks run in series or parallel using `gulp.series` and `gulp.parallel`
 */
var build = gulp.series(clean, gulp.parallel(styles, scripts));
 
/*
 * You can use CommonJS `exports` module notation to declare tasks
 */
exports.clean = clean;
exports.styles = styles;
exports.scripts = scripts;
exports.watch = watch;
exports.build = build;
/*
 * Define default task that can be called by just running `gulp` from cli
 */
exports.default = build;

Use latest JavaScript version in your gulpfile

Most new versions of node support most features that Babel provides, except the import/export syntax. When only that syntax is desired, rename to gulpfile.esm.js, install the [esm][esm-module] module, and skip the Babel portion below.

Node already supports a lot of ES2015+ features, but to avoid compatibility problems we suggest to install Babel and rename your gulpfile.js to gulpfile.babel.js.

npm install --save-dev @babel/register @babel/core @babel/preset-env

Then create a .babelrc file with the preset configuration.

{
  "presets": [ "@babel/preset-env" ]
}

And here's the same sample from above written in ES2015+.

import gulp from 'gulp';
import less from 'gulp-less';
import babel from 'gulp-babel';
import concat from 'gulp-concat';
import uglify from 'gulp-uglify';
import rename from 'gulp-rename';
import cleanCSS from 'gulp-clean-css';
import del from 'del';
 
const paths = {
  styles: {
    src: 'src/styles/**/*.less',
    dest: 'assets/styles/'
  },
  scripts: {
    src: 'src/scripts/**/*.js',
    dest: 'assets/scripts/'
  }
};
 
/*
 * For small tasks you can export arrow functions
 */
export const clean = () => del([ 'assets' ]);
 
/*
 * You can also declare named functions and export them as tasks
 */
export function styles() {
  return gulp.src(paths.styles.src)
    .pipe(less())
    .pipe(cleanCSS())
    // pass in options to the stream
    .pipe(rename({
      basename: 'main',
      suffix: '.min'
    }))
    .pipe(gulp.dest(paths.styles.dest));
}
 
export function scripts() {
  return gulp.src(paths.scripts.src, { sourcemaps: true })
    .pipe(babel())
    .pipe(uglify())
    .pipe(concat('main.min.js'))
    .pipe(gulp.dest(paths.scripts.dest));
}
 
 /*
  * You could even use `export as` to rename exported tasks
  */
function watchFiles() {
  gulp.watch(paths.scripts.src, scripts);
  gulp.watch(paths.styles.src, styles);
}
export { watchFiles as watch };
 
const build = gulp.series(clean, gulp.parallel(styles, scripts));
/*
 * Export a default task
 */
export default build;

Incremental Builds

You can filter out unchanged files between runs of a task using the gulp.src function's since option and gulp.lastRun:

const paths = {
  ...
  images: {
    src: 'src/images/**/*.{jpg,jpeg,png}',
    dest: 'build/img/'
  }
}
 
function images() {
  return gulp.src(paths.images.src, {since: gulp.lastRun(images)})
    .pipe(imagemin({optimizationLevel: 5}))
    .pipe(gulp.dest(paths.images.dest));
}
 
function watch() {
  gulp.watch(paths.images.src, images);
}

Task run times are saved in memory and are lost when gulp exits. It will only save time during the watch task when running the images task for a second time.