bankai

The easiest way to compile JavaScript, HTML and CSS.

We want people to have fun building things for the web. There should be no hurdles between a great idea, and your first prototype. And once you're ready, it should be easy to package it up and share it online. That's Bankai: a tool that helps you build for the web. No configuration, and no hassle - that's our promise.

If this is your first time building something for the web, take a look at choojs/create-choo-appto help get a project setup from scratch ✨.

Usage

$bankai <command> [entry] [options]

Commands:

build compile all files to dist/
inspect inspect the bundle dependencies
start start a development server

Options:

-d, --debug output lots of logs
-h, --help print usage
-q, --quiet don't output any logs
-v, --version print version

Examples:

Start a development server
$bankai start index.js

Visualize all dependencies in your project
$bankai inspect index.js

Compile all files in the project to disk
$bankai build index.js

Running into trouble? Feel free to file an issue:
https://github /choojs/bankai/issues/new

Do you enjoy using this software? Become a backer:
https://opencollective /choo

⚠️HTTPS Instructions

When you first open up your application in a browser, you'll probably see a warning page about HTTPS connections being untrusted. No worries, this is entirely expected behavior. Follow the instructions below to solve this for your browser.

How does this work?

For HTTPS to run onlocalhost,we must sign a TLS certificate locally. This is better known as a "self-signed certificate". Browsers actively check for certificates from uknown providers, and warn you (for good reason!) In our case, however, it's safe to ignore.

HTTPS is needed for an increasing amount of APIs to work in the browser. For example if you want to test HTTP/2 connections or use parts of the storage API, you have no choice but to use an HTTPS connection on localhost. That's why we try and make this work as efficiently, and securely as possible.

We generate a unique certificate for each Bankai installation. This means that you'll only need to trust an HTTPS certificate for Bankai once. This should be secure from remote attackers, because unless they have successfully acquired access to your machine's filesystem, they won't be able to replicate the certificate.

Firefox Instructions

Step 1

A wild security screen appears!. Click on "advanced".

Step 2

More details emerge! Click on "Add Exception".

Step 3

In the dropdown click "Confirm Security Exception".

Step 4

Success!

Chrome Instructions

Click the "more details" dropdown, then click "proceed". Pull Request for screenshots welcome!

Safari Instructions

Step 1

A wild security screen appears! Click "Show Certificate".

Step 2

More details emerge! Check "Always trust 'localhost'…".

Step 3

The box is checked! Click "Continue".

Step 4

A box is asking you for your crendentials. Fill them in, and hit "Enter".

Step 5

Success!

Optimizations

Bankai applies lots of optimizations to projects. Generally you won't need to care how we do this: it's lots of glue code, and not necessarily pretty. But it can be useful to know which optimizations we apply. This is a list:

JavaScript

• nanohtml:OptimizechooHTML code so it runs significantly faster in the browser.
• glslify:Adds a module system to GLSL shaders.
• brfs:Statically inline calls tofs.readFile().Useful to ship assets in the browser.
• envify:Allow environment variables to be used in the bundle. Especially useful in combination with minification, which removes unused code paths.
• split-require:Lazy load parts of your application using the require('split-require')function.
• babelify:Bring the latest browser features toallbrowsers. See our babel sectionfor more details.

And bankai usestinyify,which adds the following optimizations:

• browser-pack-flat:Remove function wrappers from the bundle, making the result faster to run and easier to minify.
• bundle-collapser:Remove all pathnames from inside the bundle, and replace them with IDs. This not only makes bundles smaller, it prevents details from your local dev setup leaking.
• common-shakeify:Remove unused JavaScript code from the bundle. Best known asdead code eliminationortree shaking.
• unassertify:Remove allrequire('assert')statements from the code. Only applied for production builds.
• uglifyify:Minify the bundle.

CSS

• sheetify:extract all inline CSS from JavaScript, and include it in bundle.js.
• purifyCSS:removes unused CSS from the project.
• cleanCSS:minify the bundle.

HTML

• inline-critical-css:extract all crititical CSS for a page into the <head>of the document. This means that every page will be able to render after the first roundtrip, which makes for super snappy pages.
• async load scripts:loads scripts in the background using the deferattribute.
• async load styles:loads styles in the background using the preloadattribute.
• async load styles:preloads fonts in the background using the preloadattribute.
• server render:server renders Choo applications. We're welcome to supporting other frameworks too. PRs welcome!
• manifest:includes a link tomanifest.jsonso the application can be installed on mobile.
• viewport:defines the right viewport dimensions to make applications accessible for everyone.
• theme color:sets the theme color defined inmanifest.jsonso the navigator bar on mobile is styled on brand.
• title:sets the right title on a page. Either extracts it from the application (choo only, for now) or uses whatever the title is in manifest.json.
• live reload:during development, we inject a live reload script.

Configuration

The Bankai CLI doesn't take any flags, other than to manipulate how we log to the console. Configuring Bankai is done by modifyingpackage.json.

Bankai is built on three technologies:browserify, sheetify,anddocumentify.Because these can be configured insidepackage.jsonit means that Bankai itself can be configured from there too. Also if people ever decide to switch from the command line to JavaScript, no extra configuration is needed.

{
"name":"my-app",
"browserify":{
"transform":[
"some-browserify-transform"
]
},
"sheetify":{
"transform":[
"some-sheetify-transform"
]
},
"documentify":{
"transform":[
"some-documentify-transform"
]
}
}

Custom HTML

By default, Bankai starts with an empty HTML document, injecting the tags mentionedabove.You can also create a custom template asindex.html, and Bankai will inject tags into it instead.

If you export your Choo app instance after doing.mount(),Bankai respects the mount location during server side rendering:

// app.js
...
module.exports=app.mount('#app')

<!-- index.html -->
...
<body>
<divid= "app"></div>
<divid= "footer">© 2018</div>
</body>
...

Injecting headers - favicon.ico, CDNs, manifests etc...

You might be looking to use some of the fantastic third party libraries or tools out there. Take thefont-awesomelibrary for example, but there are plenty of others. To do so, you typically need to include additional css or js libraries in your<head>.And you can do this by setting up your documentify transform.

In this example, you will need to add a "documentify" transform which specifies a js file used, but you will also need a couple of extra npm libraries which you can install with:

npm i hstream dedent

Now inpackage.json,add the following transform:

"documentify":{
"transform":[
[
"./lib/document.js",
{
"order":"end"
}
]
]
},

In this example, we are storing the transform in a folder calledlib,which you will need to create, and create adocument.jsfile in it. Edit the file calleddocument.jsand put the following transform code in it:

vardedent=require('dedent')
varhyperstream=require('hstream')

module.exports=document

functiondocument(){
returnhyperstream({
'meta[name= "viewport" ]':{
content:'width=device-width, initial-scale=1, viewport-fit=cover'
},
head:{
_prependHtml:dedent`
<link rel= "manifest" href= "manifest.json" >
<link rel= "stylesheet" href= "https://cdnjs.cloudflare /ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" >
`,
_appendHtml:dedent`
<link rel= "shortcut icon" href= "/favicon.ico" >
`
}
})
}

This example now enables Bankai to generate anindex.htmlfile which has a link to the font-awesome css cdn, amanifest.jsonfile, and afavicon.icofile ready for deployment.

Service Workers

Bankai comes with support for service workers. You can place a service worker entry point in a file calledsw.jsorservice-worker.js.Bankai will output a browserify bundle by the same name.

You can easily register service workers using choo-service-worker:

app.use(require('choo-service-worker')())

choo-service-worker defaults to/sw.jsfor the service worker file name. If you named your service workerservice-worker.jsinstead, do:

app.use(require('choo-service-worker')('/service-worker.js'))

Service workers have access to some environment variables:

• process.env.STYLE_LIST:An array of URLs to stylesheet files.
• process.env.SCRIPT_LIST:An array of URLs to script files.
• process.env.ASSET_LIST:An array of URLs to assets.
• process.env.DOCUMENT_LIST:An array of URLs to server-rendered routes.
• process.env.MANIFEST_LIST:An array containing the URL to the manifest file.
• process.env.FILE_LIST:An array of URLs to assets and routes. This can be used to add all your app's files to a service worker cache.

HTTP

Bankai can be hooked up directly to an HTTP server, which is useful when working on full stack code.

varbankai=require('bankai/http')
varhttp=require('http')
varpath=require('path')

varcompiler=bankai(path.join(__dirname,'client.js'))
varserver=http.createServer(function(req,res){
compiler(req,res,function(){
res.statusCode=404
res.end('not found')
})
})

server.listen(8080,function(){
console.log('listening on port 8080')
})

Babel

Not all browsers support all of the Web Platform's features. So in order to use newer features on older browsers, we have to find a solution. The best solution out there at the moment is Babel.

Babelis a plugin-based JavaScript compiler. It takes JavaScript in, and outputs JavaScript based for the platforms you've decided to target. In Bankai we target the last 2 versions of FireFox, Chrome and Edge, and every other browser that's used by more than 1% of people on earth. This includes IE11. And if you have different opinions on which browsers to use, Bankai respects.babelrcand.browserslistrcfiles.

Some newer JavaScript features require loading an extra library;async/await being the clearest example. To enable such features, thebabel-polyfill library needs to be included in your application's root (e.g.index.js).

require('babel-polyfill')

We don't include this file by default in Bankai, because it has a significant size overhead. Once Babel includes only the language features you're using, we'll work to includebabel-polyfillby default.

Events

compiler.on('error', callback(nodeName, edgeName, error))

Whenever an internal error occurs.

compiler.on('change', callback(nodeName, edgeName, state))

Whenever a change in the internal graph occurs.

API

compiler = bankai(entry, [opts])

Create a new bankai instance. Takes a path to a JavaScript file as the first argument. The following options are available:

• opts.quiet:Defaults tofalse.Don't output any data tostdout.Useful if you have your own logging system.
• opts.watch:Defaults totrue.Watch for changes in the source files and rebuild. Set tofalseto get optimized bundles.
• babelifyDeps:Defaults to true. Transform dependencies with babelify.

compiler.documents(routename, [opts], done(err, { buffer, hash }))

Output an HTML bundle for a route. Routes are determined based on the project's router. Pass'/'to get the default route.

• opts.state:Will be passed the render function for the route, and inlined in the<head>of the body aswindow.initialState.

compiler.scripts(filename, done(err, { buffer, hash }))

Pass in a filename and output a JS bundle.

compiler.assets(assetName, done(err, { buffer, hash }))

Output any other file besides JS, CSS or HTML.

compiler.styles(name, done(err, { buffer, hash }))

Output a CSS bundle.

compiler.manifest(done(err, { buffer, hash }))

Output amanifest.json.

compiler.serviceWorker(done(err, { buffer, hash }))

Output a service worker.

compiler.close()

Close all file watchers.

License

Apache License 2.0