This project is currently in maintenance mode. New contributors are more than welcome!
This library adds CommonJS module support to Sprockets (via Browserify).
It lets you mix and match //= require directives and require() calls for including plain javascript files as well as modules. However, it is important to remember that once you are into code that is being browserified you can no longer use sprockets-style require (so no //= require). In many cases, it makes sense to put all your sprockets-required code in a separate file or at the very least at the top of your main JavaScript file. Then use require() to pull in the CommonJS code.
- Manage JS modules with
npm - Serve assets with Sprockets
- Require modules with
require()(without separate//= requiredirectives) - Only build required modules
- Require npm modules in your Rails assets
- Require modules relative to asset paths (ie app/assets/javascript) with non-relative syntax (see below before using)
- Configure browserify options for each JavaScript file so you can mark modules with
--require,--external, etc
As the primary developer, I'm going to offer some opiniated advice. The sweet spot for this gem is for Rails projects with legacy JavaScript (not using CommonJS/modules). This gem is a great way to make it possible to rewrite that legacy JavaScript to CommonJS on a timeline that you dictate. Then consider stepping off the Rails asset pipeline or using another gem.
If you're starting a new Rails project today, I highly recommend looking at alternatives to this gem. The primary reason is that this gem, while it works well, is not as efficient as most would like for local development. Also a lot has changed over the last couple of years.
An example of that change is this project from Rails:
This is a huge step in the right direction for the Rails community. In the past, it has been extremely frustrating working with JavaScript on the asset pipeline. The good news is you have a lot of great choices. If I were starting a new Rails project today, I think the safest choice is one in which you have a Procfile that kicks off a separate Webpack build and you use zero Rails magic. A slightly less safe but maybe more convenient choice would be trying rails/webpacker or another gem. The choice is yours.
For more discussion on this topic, see issues 203, 161, 43, etc.
Add this line to your application's Gemfile:
gem "browserify-rails"
Create package.json in your Rails root:
{
"name": "something",
"dependencies" : {
"browserify": "^14.0.0",
"browserify-incremental": "^3.1.0"
},
"license": "MIT",
"engines": {
"node": ">= 0.10"
}
}Then run:
npm install
Then start writing CommonJS, and everything will magically work!:
// foo.js
module.exports = function (n) { return n * 11 }
// application.js
var foo = require('./foo');
console.log(foo(12));Do not put module.exports or require() in JavaScript comments or strings.
Doing so will certainly cause issues with compilation that are difficult to
track down.
This happens because browserify-rails works by parsing your JavaScript files for these keywords that indicate whether it is a module, or is requiring a module. If a file meets one of these criteria, browserify will compile the modules as expected.
Because browserify-rails is working within the restraints of Ruby/Sprockets, the parsing is done by Ruby and therefore does not know whether it is a JavaScript string, comment, or function.
For CoffeeScript support, make sure to follow the standard rails
.js.coffee naming convention. You'll also need to add the npm
package coffeeify as a dependency:
{
// ...
"dependencies" : {
// ...
"coffeeify": "~0.6"
}
}and configure browserify_rails accordingly:
config.browserify_rails.commandline_options = "-t coffeeify --extension=\".js.coffee\""- node-browserify 4.x
- browserify-incremental
You can configure different options of browserify-rails by adding one of the lines
mentioned below into your config/application.rb or your environment file
(config/environments/*.rb):
class My::Application < Rails::Application
# Specify the file paths that should be browserified. We browserify everything that
# matches (===) one of the paths. So you will most likely put lambdas
# regexes in here.
#
# By default only files in /app and /node_modules are browserified,
# vendor stuff is normally not made for browserification and may stop
# working.
config.browserify_rails.paths << /vendor\/assets\/javascripts\/module\.js/
# Environments in which to generate source maps
#
# The default is none
config.browserify_rails.source_map_environments << "development"
# Should the node_modules directory be evaluated for changes on page load
#
# The default is `false`
config.browserify_rails.evaluate_node_modules = true
# Force browserify on every found JavaScript asset if true.
# Can be a proc.
#
# The default is `false`
config.browserify_rails.force = ->(file) { File.extname(file) == ".ts" }
# Command line options used when running browserify
#
# can be provided as an array:
config.browserify_rails.commandline_options = ["-t browserify-shim", "--fast"]
# or as a string:
config.browserify_rails.commandline_options = "-t browserify-shim --fast"
# Define NODE_ENV to be used with envify
#
# defaults to Rails.env
config.browserify_rails.node_env = "production"browserify-incremental is used to cache browserification of CommonJS modules. One of the side effects is that the absolute module path is included in the emitted JavaScript. Most people do not want this for production code so browerify-incremental is current disabled for the production and staging environments. Note that counter-intuitively, browserify-incremental helps even with a single build pass of your code because typically the same modules are used multiple times. So it helps even for say asset compilation on a push to Heroku.
To enable browserify-incremental in production, add the following line to config/environments/production.rb:
config.browserify_rails.use_browserifyinc = truenode-browserify supports multiple bundles
and so do does rails-browserify. It does this using config/browserify.yml.
Below is an example.
Say you have three JavaScript files and one is a huge library you would like to use in both. Browserify lets you mark that huge library with --require in one file (to both bundle it and mark it with a special internal ID) and then require it in the other file and mark it with --external (so it is not bundled into the file but instead accessed via browserify internals using that special ID). Note that this only works when the file that has the library bundled is loaded before the file that uses the library with --external.
javascript:
main:
require:
- a_huge_library
secondary:
external:
- a_huge_libraryNote that any valid browserify option is allowed in the YAML file but not all use cases have been considered. If your use case does not work, please open an issue with a runnable example of the problem including your browserify.yml file.
To make browserify-rails work inside an isolated engine, add the engine app directory to the browserify-rails paths (inside engine.rb):
config.browserify_rails.paths << -> (p) { p.start_with?(Engine.root.join("app").to_s) }If you wish to put the node_modules directory within the engine, you have some control over it with:
config.browserify_rails.node_bin = "some/directory"Refer to this repo for setting up this gem with ES6 and all front-end goodies like react and all - github.com/gauravtiwari/browserify-rails
In the Rails asset pipeline, it is common to have files in
app/assets/javascripts and being able to do //= require some_file which
exists in one of the asset/javascript directories. In some cases, it is
useful to have similar functionality with browserify. This has been added
by putting the Rails asset paths into NODE_PATH environment variable when
running browserify.
But this comes at a large cost: right now, it appears to break source maps. This might be a bug or a fixable breakage but it hasn't been solved yet. The use of NODE_PATH is also contentious in the NodeJS community.
Why leave it in? Because some typical Rails components break without it. For example, jasmine-rails expects to be able to move JavaScript to different depths. So if you do a relative require from spec/javascript to app/assets/javascripts, your tests will fail to run when RAILS_ENV=test.
So if you really need this, use it. But if you really need it for files that are not tests, you should definitely figure out an alternative. Support for this may go away if we cannot fix the issue(s) with source maps being invalid.
Heroku is a very common target for deploying. You'll have to add custom
buildpacks that run bundle and npm install on the target machine.
$ heroku buildpacks:add https://github.com/heroku/heroku-buildpack-nodejs.git
$ heroku buildpacks:add https://github.com/heroku/heroku-buildpack-ruby.git
You can easily use a browserify transform by making some additions to your package.json and creating a .babelrc. For example, here is how you can add ES6 support in your app:
- Add
babelifyandbabel-preset-es2015to yourpackage.jsonin your app's root directory either by editing the file directly and runningnpm installor usingnpm install babelify --saveandnpm install babel-preset-es2015 --save - Update your
package.jsonto contain the babelify transform by adding the following lines
"browserify": {
"transform": [
[
"babelify"
]
]
}
- Create a
.babelrcfile in the project root with the following contents
{
"plugins": [],
"presets": ["es2015"]
}
- Create some
.es6files and require them withvar m = require('./m.es6')orimport m from './m.es6' - Restart your server, and you now have ES6 support!
The Rails asset pipeline caches some files in the tmp directory inside
Rails root. It can happen that sometimes the cache does not get invalidated
correctly. You can manually clear the cache in at least two ways:
rake tmp:cache:clearrm -rf ./tmp(when in the root directory of the Rails project)
The second method is definitely brute force but if you experience issues, it is definitely worth trying before spending too much time debugging why something that is browserified appears to not match the sources files.
If you want to use browserify to process test files as well, you will
need to configure browserify-rails to process files in your spec or test
directories.
config.browserify_rails.paths << -> (p) { p.start_with?(Rails.root.join("spec/javascripts").to_s) }If you have Sprockets precompile multiple JS files, each of which include certain browserified files, your acceptance tests may timeout before some of the assets have finished compiling.
To avoid this problem, run rake assets:precompile before running your
acceptance tests.
Pull requests appreciated. Pull requests will not be rejected based on ideological neurosis of either the NodeJS or the Ruby on Rails communities. In other words, technical needs are respected.
There is a dummy rails app in test/dummy. You can change to that directory
and run bundle install and then bundle exec rails server. You can see
the test JavaScript files in app/assets/javascripts so try loading one --
for example http://localhost:3000/assets/application.js.
You can use this dummy app to try out your coding/refactoring/hacking ideas
and also see how the tests are written. To run the tests, run bundle exec rake test
in the root directory of the browserify-rails code (not in the dummy app).
Often one has one main module (say a library module) and other modules that consume the main module. It would be nice to be able to establish this relationship in the YAML file to avoid having to manually manage the require and external entries for the involved modules.
Use a tool like ProcMan to kick off a webpack or browserify process to rebuild your JavaScript on change. Reference the bundle in your Rails template and away you go. With webpack, you can even use the dev server and point to the dev server port in your Rails template to load JavaScript directly from webpack (it'll block on build so you'll always get your latest code). This does require configuring webpack hot middleware to have a port (see __webpack_hmr goes to the wrong port and fails).
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