The streaming build system

[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Azure Pipelines Build Status][azure-pipelines-image]][azure-pipelines-url] [![Build Status][travis-image]][travis-url] [![AppVeyor Build Status][appveyor-image]][appveyor-url] [![Coveralls Status][coveralls-image]][coveralls-url] [![OpenCollective Backers][backer-badge]][backer-url] [![OpenCollective Sponsors][sponsor-badge]][sponsor-url] [![Gitter chat][gitter-image]][gitter-url] ## 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][quick-start]. ## 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][getting-started-guide] and [API docs][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. ```js 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 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`. ```sh npm install --save-dev @babel/register @babel/core @babel/preset-env ``` Then create a **.babelrc** file with the preset configuration. ```js { "presets": [ "@babel/preset-env" ] } ``` And here's the same sample from above written in **ES2015+**. ```js 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`: ```js 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. ## Want to contribute? Anyone can help make this project better - check out our [Contributing guide](/CONTRIBUTING.md)! ## Backers Support us with a monthly donation and help us continue our activities. [![Backers][backers-image]][support-url] ## Sponsors Become a sponsor to get your logo on our README on Github. [![Sponsors][sponsors-image]][support-url] [downloads-image]: https://img.shields.io/npm/dm/gulp.svg [npm-url]: https://www.npmjs.com/package/gulp [npm-image]: https://img.shields.io/npm/v/gulp.svg [azure-pipelines-url]: https://dev.azure.com/gulpjs/gulp/_build/latest?definitionId=1&branchName=master [azure-pipelines-image]: https://dev.azure.com/gulpjs/gulp/_apis/build/status/gulp?branchName=master [travis-url]: https://travis-ci.org/gulpjs/gulp [travis-image]: https://img.shields.io/travis/gulpjs/gulp.svg?label=travis-ci [appveyor-url]: https://ci.appveyor.com/project/gulpjs/gulp [appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/gulp.svg?label=appveyor [coveralls-url]: https://coveralls.io/r/gulpjs/gulp [coveralls-image]: https://img.shields.io/coveralls/gulpjs/gulp/master.svg [gitter-url]: https://gitter.im/gulpjs/gulp [gitter-image]: https://badges.gitter.im/gulpjs/gulp.svg [backer-url]: #backers [backer-badge]: https://opencollective.com/gulpjs/backers/badge.svg?color=blue [sponsor-url]: #sponsors [sponsor-badge]: https://opencollective.com/gulpjs/sponsors/badge.svg?color=blue [support-url]: https://opencollective.com/gulpjs#support [backers-image]: https://opencollective.com/gulpjs/backers.svg [sponsors-image]: https://opencollective.com/gulpjs/sponsors.svg [quick-start]: https://gulpjs.com/docs/en/getting-started/quick-start [getting-started-guide]: https://gulpjs.com/docs/en/getting-started/quick-start [api-docs]: https://gulpjs.com/docs/en/api/concepts