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build.js
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build.js
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var fs = require('fs')
var path = require('path')
var mkdirp = require('mkdirp')
var browserify = require('browserify')
var html = require('bel')
var colors = require('colors')
var purify = require('purify-css')
var Clean = require('clean-css')
var dedent = require('dedent')
var minify = require('html-minifier').minify
var concat = require('concat-stream')
var documentify = require('documentify')
var hyperstream = require('hyperstream')
var pump = require('pump')
var critical = require('inline-critical-css')
var favicons = require('favicons')
var graph = require('buffer-graph')()
var entry = 'index.js'
var basedir = path.dirname(entry)
var outdir = path.join(basedir, 'dist')
var clean = new Clean(createCleanCssOptions())
graph.on('change', (nodeName, edgeName, state) => {
var eventName = nodeName + ':' + edgeName
, file
, data
, log
if (eventName === 'scripts:bundle') {
file = path.join(outdir, 'bundle.js')
data = state.scripts.bundle.buffer
log = ' ✨ create bundle.js'
} else if (eventName === 'documents:bundle') {
file = path.join(outdir, 'index.html')
data = state.documents.bundle.buffer
log = ' ✨ create index.html'
} else if (eventName === 'manifest:bundle') {
file = path.join(outdir, 'manifest.json')
data = state.manifest.bundle.buffer
log = ' ✨ create manifest.json'
} else if (eventName === 'serviceWorker:bundle') {
file = path.join(outdir, 'sw.js')
data = state.serviceWorker.bundle.buffer
log = ' ✨ create sw.js'
} else if (eventName === 'styles:bundle') {
file = path.join(outdir, 'bundle.css')
data = state.styles.bundle.buffer
log = ' ✨ create bundle.css'
} else if (eventName === 'favicon:bundle') {
file = path.join(outdir, 'favicon.ico')
data = state.favicon.bundle.buffer
log = ' ✨ create favicon.ico'
}
if (file) {
writeFile(file, data, log)
}
})
graph.node('scripts', (state, createEdge) => {
var b = browserify({debug: true})
var mapName = 'bundle.js.map'
var mapFile = path.join(outdir, mapName)
b.add(entry)
.transform('sheetify', { use: [ 'sheetify-inline', 'sheetify-cssnext' ] })
.plugin('css-extract', { out: bundleStyles })
bundleScripts()
function bundleStyles () {
return concat({ encoding: 'buffer' }, (buf) => {
createEdge('style', buf)
})
}
function bundleScripts () {
b.bundle((err, bundle) => {
createEdge('bundle', bundle)
})
}
})
graph.node('favicon', (state, createEdge) => {
var fileName = path.join(basedir, 'app/assets/icon.png')
favicons(fileName, createFavIconOptions(), (err, res) => {
var icon = res.images.find((image) => {
return image.name === 'favicon.ico'
})
createEdge('bundle', icon.contents)
})
})
graph.node('documents', [ 'scripts:bundle', 'manifest:bundle', 'serviceWorker:bundle', 'styles:bundle', 'favicon:bundle' ], (state, createEdge) => {
var body = '<div></div>'
var language = 'en'
var html = head(body, language)
var d = documentify(entry, html)
d.transform(viewportTransform)
d.transform(polyfillTransform)
d.transform(scriptTransform)
d.transform(styleTransform)
d.transform(preloadTransform)
d.transform(manifestTransform)
d.transform(descriptionTransform, { description: "A very cute app" })
d.transform(titleTransform, { title: 'choo-scriber' })
d.transform(criticalTransform, { css: state.styles.bundle.buffer })
d.transform(faviconTransform, { icon: state.favicon.bundle.buffer})
var source = d.bundle()
pump(source, concat({ encoding: 'buffer' }, sink))
function sink (buf) {
createEdge('bundle', buf)
}
function head (body, lang) {
var dir = 'ltr'
return `<!DOCTYPE html><html lang="${lang}" dir="${dir}"><head></head>${body}</html>`
}
function faviconTransform (opts) {
var header = `
<link rel="icon" type="image/x-icon" href="favicon.ico">
`.replace(/\n +/g, '')
return addToHead(header)
}
function criticalTransform (opts) {
return critical(String(opts.css))
}
function titleTransform (opts) {
var header = `
<title>${opts.title}</title>
`.replace(/\n +/g, '')
return addToHead(header)
}
function descriptionTransform (opts) {
var header = `
<meta name="description" content="${opts.description}">
`.replace(/\n +/g, '')
return addToHead(header)
}
function manifestTransform () {
var header = `
<link rel="manifest" href="/manifest.json">
`.replace(/\n +/g, '')
return addToHead(header)
}
function preloadTransform () {
var content = ';(function(a){"use strict";var b=function(b,c,d){function e(a){return h.body?a():void setTimeout(function(){e(a)})}function f(){i.addEventListener&&i.removeEventListener("load",f),i.media=d||"all"}var g,h=a.document,i=h.createElement("link");if(c)g=c;else{var j=(h.body||h.getElementsByTagName("head")[0]).childNodes;g=j[j.length-1]}var k=h.styleSheets;i.rel="stylesheet",i.href=b,i.media="only x",e(function(){g.parentNode.insertBefore(i,c?g:g.nextSibling)});var l=function(a){for(var b=i.href,c=k.length;c--;)if(k[c].href===b)return a();setTimeout(function(){l(a)})};return i.addEventListener&&i.addEventListener("load",f),i.onloadcssdefined=l,l(f),i};"undefined"!=typeof exports?exports.loadCSS=b:a.loadCSS=b})("undefined"!=typeof global?global:this);'
content += ';(function(a){if(a.loadCSS){var b=loadCSS.relpreload={};if(b.support=function(){try{return a.document.createElement("link").relList.supports("preload")}catch(b){return!1}},b.poly=function(){for(var b=a.document.getElementsByTagName("link"),c=0;c<b.length;c++){var d=b[c];"preload"===d.rel&&"style"===d.getAttribute("as")&&(a.loadCSS(d.href,d,d.getAttribute("media")),d.rel=null)}},!b.support()){b.poly();var c=a.setInterval(b.poly,300);a.addEventListener&&a.addEventListener("load",function(){b.poly(),a.clearInterval(c)}),a.attachEvent&&a.attachEvent("onload",function(){a.clearInterval(c)})}}})(this);'
var header = `<script nomodule>${content}</script>`
return addToHead(header)
}
function scriptTransform () {
var header = `<script src="bundle.js" defer></script>`
return addToHead(header)
}
function styleTransform (opts) {
var header = `<link rel="preload" as="style" href="bundle.css" onload="this.rel='stylesheet'">`
return addToHead(header)
}
function viewportTransform () {
var header = `
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
`.replace(/\n +/g, '')
return addToHead(header)
}
function polyfillTransform () {
var link = 'https://cdn.polyfill.io/v2/polyfill.min.js'
var header = `<script src="${link}" defer></script>`
return addToHead(header)
}
function addToHead (str) {
return hyperstream({
head: {
_appendHtml: str
}
})
}
})
graph.node('manifest', (state, createEdge) => {
var file = dedent`
{
"name": "choo-scriber",
"short_name": "choo-scriber",
"description": "A very cute app",
"start_url": "/",
"display": "standalone",
"background_color": "whitesmoke"
}
`
createEdge('bundle', Buffer.from(file))
})
graph.node('serviceWorker', (state, createEdge) => {
fs.readFile('sw.js', (err, data) => {
createEdge('bundle', data)
})
})
graph.node('styles', [ 'scripts:style', 'scripts:bundle' ], (state, createEdge) => {
var script = String(state.scripts.bundle.buffer)
, style = String(state.scripts.style.buffer)
, bundle = purify(script, style, { minify: true })
bundle = clean.minify(bundle).styles
createEdge('bundle', Buffer.from(bundle))
})
mkdirp(outdir, () => {
graph.start()
})
function writeFile (file, data, log) {
fs.writeFile(file, data, () => {
console.log(log.green)
})
}
function createCleanCssOptions () {
return {
level: {
1: {
specialComments: 0
}
}
}
}
function createFavIconOptions () {
return {
icons: {
android: false,
appleIcon: false,
appleStartup: false,
favicons: true,
firefox: false,
windows: false,
yandex: false
}
}
}