The streaming build system
There are a few ways to install:
npm install gulp@nextnpm install gulpjs/gulp#v4.0.0-alpha.3npm install gulpFor a Getting started guide, API docs, recipes, making a plugin, etc. check out our docs!
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);
}
/*
* You can use CommonJS `exports` module notation to declare tasks
*/
exports.clean = clean;
exports.styles = styles;
exports.scripts = scripts;
exports.watch = watch;
/*
* 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 still use `gulp.task` to expose tasks
*/
gulp.task('build', build);
/*
* Define default task that can be called by just running `gulp` from cli
*/
gulp.task('default', build); Use latest JavaScript version in your gulpfile
Node already supports a lot of ES2015, to avoid compatibility problem we suggest to install Babel and rename your gulpfile.js as gulpfile.babel.js.
npm install --save-dev babel-register babel-preset-es2015
Then create a .babelrc file with the preset configuration.
{
"presets": [ "es2015" ]
}
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 };
/*
* You can still use `gulp.task`
* for example to set task names that would otherwise be invalid
*/
const build = gulp.series(clean, gulp.parallel(styles, scripts));
gulp.task('build', build);
/*
* Export a default task
*/
export default build;
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.
If you want to compare modification time between files instead, we recommend these plugins:
gulp-newer example:
function images() {
var dest = 'build/img';
return gulp.src(paths.images)
.pipe(newer(dest)) // pass through newer images only
.pipe(imagemin({optimizationLevel: 5}))
.pipe(gulp.dest(dest));
}
If you can't simply filter out unchanged files, but need them in a later phase of the stream, we recommend these plugins:
gulp-remember example:
function scripts() {
return gulp.src(scriptsGlob)
.pipe(cache('scripts')) // only pass through changed files
.pipe(header('(function () {')) // do special things to the changed files...
.pipe(footer('})();')) // for example,
// add a simple module wrap to each file
.pipe(remember('scripts')) // add back all files to the stream
.pipe(concat('app.js')) // do things that require all files
.pipe(gulp.dest('public/'))
}
Anyone can help make this project better - check out our Contributing guide!
Support us with a monthly donation and help us continue our activities.
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