Advanced JavaScript
Build Pipelines
with Gulp.js
Let's talk a
short bit about
the JS build tool
revolution
HTML
CSS
JavaScript
Sass CoffeeScript LESS
P o s t C S S H A M L J a d e
U g l i f y E S 6 R e a c t J S
Browserify AngularJS
Ember CSSMin JSLint
ESHint ImageOptim Mocha
Jasmine TypeScript
1530 lines of code
original Ant tasks used:
concat — copy — delete — mkdir
Maybe Java isn't the right
tool?
Java is to JavaScript whatAlf is to Gandalf
Grunt started a boom
Gruntfiles get long
Grunt tasks get slow:
lots of reads
and writes
One unmanageable horde
of (sometimes)
low quality plug-ins
And then came Gulp
React is in love with
Webpack
Ember.js digs Broccoli.js
Ember.js digs Broccoli.js
So… every community seems
to have its preference
Stick with your communities
preference!
For all the rest?
Gulp might be a good,
very good option
Disclaimer
I (occasionally) contribute to
Gulp
I'm writing a book on Gulp
http://bit.ly/gulp-tool-book
39% off with 39baumgarcoupon code!
gulp.src(…) gulp.dest(…)
Reads files Writes files
gulp.src(…) .pipe(uglify()) gulp.dest(…)
gulp.src(…) .pipe(uglify()) gulp.dest(…).pipe(concat())
task
manager
streaming
file
system
file watcher
gulp.task('scripts', function() { !
return gulp.src(‘src/**/*.js') !
.pipe(uglify()) !
.pipe(concat('main.min.js')) !
.pipe(gulp.dest('dist')); !
}); !
!
gulp.task('default', function(done) { !
gulp.watch(‘src/**/*.js', gulp.parallel(‘scripts')); !
done(); !
}); !
undertaker.task('scripts', function() { !
return vinyl.src(‘src/**/*.js') !
.pipe(uglify()) !
.pipe(concat('main.min.js')) !
.pipe(vinyl.dest('dist')); !
}); !
!
undertaker.task('default', function(done) { !
chokidar.watch(‘src/**/*.js', undertaker.parallel(‘scripts')); !
done(); !
}); !
so similar … yet so
different?
Gulp
Streams
Browserify
Streams
var source = require(‘vinyl-source-stream’); !
!
var b = browserify({ !
entries: ['_js/main.js'] !
}); !
!
var bundle = function() { !
return b.bundle() !
.pipe(source(‘main.js’)) !
.pipe(gulp.dest('js')); !
} !
!
gulp.task(‘bundle’, bundle); !
This also goes the
other way around…
var app = express(); !
var router = express.Router(); !
!
router.get('/*', function(req, res) { !
var stream = request('http://host.to.forward.to' + req.originalUrl); !
stream.pipe(res); !
stream !
.pipe(source('.' + req.originalUrl)) !
.pipe(gulp.dest('./cachedir')); !
}); !
!
app.use(express.static('_site')); !
app.use(express.static('cachedir')); !
app.use(router); !
var app = express(); !
var router = express.Router(); !
!
router.get('/*', function(req, res) { !
var stream = request('http://host.to.forward.to' + req.originalUrl); !
stream.pipe(res); !
stream !
.pipe(source('.' + req.originalUrl)) !
.pipe(gulp.dest('./cachedir'));!
}); !
!
app.use(express.static('_site')); !
app.use(express.static('cachedir')); !
app.use(router); !
So start thinking
streams …
Multiple input formats
return gulp.src(‘src/**/*.coffee) !
.pipe(coffee()) !
.pipe(uglify()) !
.pipe(concat(‘main.js’)) !
.pipe(gulp.dest(‘build’)) !
Multiple input formats
return gulp.src(‘src/**/*.js) !
.pipe(uglify()) !
.pipe(concat(‘main.js’)) !
.pipe(gulp.dest(‘build’)) !
Multiple input formats
return gulp.src(‘src/**/*.js) !
.pipe(uglify()) !
.pipe(concat(‘main.js’)) !
.pipe(gulp.dest(‘build’)) !
the same!
Multiple input formats
And actually, you just want
one bundle in the end
What if we could
reuse parts of the
stream?
return gulp.src(‘app1/src/**/*.coffee’) !
.pipe(coffee()) !
.pipe(uglify() !
.pipe(concat(‘main.js’)) !
.pipe(gulp.dest('build')); !
var merge = require(‘merge2’); !
!
return merge(gulp.src(‘app1/src/**/*.coffee’) !
.pipe(coffee()), !
gulp.src(‘app1/src/**/*.js’)) !
.pipe(uglify() !
.pipe(concat(‘main.js’)) !
.pipe(gulp.dest('build')); !
var merge = require(‘merge2’); !
!
return gulp.src(‘app1/src/**/*.coffee’) !
.pipe(markdown()), !
.pipe(gulp.src(‘app1/src/**/*.js’), {passthrough: true}) !
.pipe(rename(blogFn)) !
.pipe(wrap(layoutStr)) !
.pipe(swig()) !
.pipe(gulp.dest('build')); !
Multiple bundles
And now we need this
over and over again
for all our applications…
var elems = [ !
{ dir: ‘app1’, bundleName: ‘app1.min.js’ }, !
{ dir: ‘app2’, bundleName: ‘app2.min.js’ } !
]; !
!
var streams = elems.map(function(el) { !
return gulp.src(el.dir + ‘src/**/*.coffee’) !
.pipe(coffee()), !
.pipe(gulp.src(el.dir + ‘src/**/*.js’), {passthrough: true}) !
.pipe(uglify()) !
.pipe(concat(el.bundleName)) !
}); !
return merge(streams) !
.pipe(gulp.dest('build')); !
Incremental
builds
Some tasks take long
gulp.src(‘scripts/*.js’) !
.pipe(uglify()) !
.pipe(gulp.dest()) !
.pipe(concat()) !
Too much is going on!
Each change: Uglify all
the files?
filter files
that have changed
do performance
heavy operations
remember the
old files
and continue
with the other ops
gulp.task('scripts', function () { !
return gulp.src('app/scripts/**/*.js') !
.pipe(cached('ugly')) !
.pipe(uglify()) !
.pipe(remember('ugly')) !
.pipe(concat('main.min.js')) !
.pipe(gulp.dest('dist/scripts')); !
}); !
gulp.task('scripts', function () { !
return gulp.src('app/scripts/**/*.js') !
.pipe(cached('ugly')) !
.pipe(uglify()) !
.pipe(remember('ugly')) !
.pipe(concat('main.min.js')) !
.pipe(gulp.dest('dist/scripts')); !
}); !
we use the cache to
check if files have
changed
gulp.task('scripts', function () { !
return gulp.src('app/scripts/**/*.js') !
.pipe(cached('ugly')) !
.pipe(uglify()) !
.pipe(remember('ugly')) !
.pipe(concat('main.min.js')) !
.pipe(gulp.dest('dist/scripts')); !
}); !
once we are done,
we remember all
the other files
we stored in
the cache
gulp.task('lint', function () { !
return gulp.src(‘src/**/*.js’) !
.pipe(jshint()) !
.pipe(jshint.reporter(‘default’)) !
.pipe(jshint.reporter(‘fail’)); !
}); !
gulp.task('lint', function () { !
return gulp.src(‘src/**/*.js’, { since: gulp.lastRun(‘lint’) }) !
.pipe(jshint()) !
.pipe(jshint.reporter(‘default’)) !
.pipe(jshint.reporter(‘fail’)); !
}); !
gulp.task('images', function () { !
return gulp.src(‘src/images/**/*.*’) !
!
.pipe(imagemin()) !
.pipe(gulp.dest(‘dist’)); !
}); !
gulp.task('images', function () { !
return gulp.src(‘src/images/**/*.*’) !
.pipe(newer(‘dist’)) !
.pipe(imagemin()) !
.pipe(gulp.dest(‘dist’)); !
}); !
When architecting
Gulp build pipelines…
Separate the process
from the content
Think about how the
basic pipeline would
look like
Think about how
your data looks like
And then posh your pipes up
with stream tools that
change your data accordingly
Thank you … !
@ddprrt
Material
Workshop files
https://github.com/frontend-tooling
https://github.com/frontend-tooling/sample-project-gulp
https://github.com/frontend-tooling/static-site-generator
http://fettblog.eu
http://speakerdeck.com/ddprrt
Reading Material
http://bit.ly/gulp-tool-book
39% off with 39baumgarcoupon code!
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