latest JS ecosystem. Using CDN builds was one option. Using rails-assets.org with bower was one option that used for some time. There were also unofficial integrations with browserify or webpack
all of the dependencies in our code and then packaging them so that a single file can be deployed after compiling and running all the post processing tools.
us. Managing all of the dependencies in our code and then packaging them so that a single file can be deployed after compiling and running all the post processing tools.
for us. Managing all of the dependencies in our code and then packaging them so that a single file can be deployed after compiling and running all the post processing tools.
require underscore-rails In theory everyone should be using //= require statement at the top of their file to declare the dependencies of their file, but in my experience this starts breaking down in big projects and people rely on certain things always being available. We are basically relying on globals to be available so that the concatenation works.
understand package.json Yarn had proper lock file like bundler and it was created facebook to solve the unreliability with npm. Though npm improved in latter releases.
browser. We also want to use third party libraries like jQuery. The way bundling JavaScript works in Sprockets is that it concatenates all the files together, relying on the programmer to assign and reference global variables in each file,
theory everyone should be using //= require statement at the top of their file to declare the dependencies of their file, but in my experience this starts breaking down in big projects and people rely on certain things always being available. We are basically relying on globals to be available so that the concatenation works.
use them with each other to manage different parts of code. But having module system is not the only challenge, browsers also need to understand it. And we know that browsers heavily rely on global objects. Let’s see an example.
code shows us how modules can be defined. This works fine in server side code. But to make this work with browsers we need tools that will resolve this require or import calls and make browsers understand them.
us ability to modularize the code. It also implements a way to translate JavaScript code that doesn't work in any web browser to JavaScript code that works in most web browsers.
So it is hard to use and hard to understand. But nothing in Webpack “just works”—you have to provide configuration for Webpack's most basic features to work.
lot of time in documentation and a lot of time making decisions that have nothing to do with our users or the problems we're trying to solve for them. As a consequence, it is fairly complex to configure from scratch making it somewhat of an odd choice for Rails, which promotes convention over configuration. Webpacker fills the gap.
create config/webpack/development.js create config/webpack/environment.js create config/webpack/production.js create config/webpack/test.js When web packer is installed, it sets up common conventions and configurations for different environments and default options for web pack.
⠁ @rails/actioncable@^6.0.0-alpha warning @rails/webpacker > postcss-preset-env > postcss- color-functional-notation > postcss-values-parser > flatten@1.0.2: I wrote this module a very long time ago; you should use something else. [2/4] Fetching packages... [3/4] Linking dependencies... [4/4] Building fresh packages... success Saved lockfile. success Saved 602 new dependencies. info Direct dependencies !" @rails/actioncable@6.0.0-alpha !" @rails/activestorage@6.0.0-alpha !" @rails/ujs@6.0.0-alpha !" @rails/webpacker@4.0.7 #" turbolinks@5.2.0 It also sets up required npm packages using yarn. This includes all packages that Rails itself depends on.
our javascript code now. Earlier it was app/assets/javascripts now it is app/javascript. You might be wondering why the javascript in the directory name instead of assets or say javascripts?
the language as DHH says here. It is very significant statement as it acknowledges javascript part of the application as equal partner in the relationship.
only meant to manage our JavaScript code not the other assets like font/images. They are still managed by asset pipeline like before. In that way, we still have assets pipeline enabled in Rails 6 but only for non-javascript assets.
to start building the bundle The convention here is that all webpack entry points should be placed in the app/*javascript/*packs folder and the modules can be placed inside app/*javascript folder in any way you like.
start building the bundle The convention here is that all webpack entry points should be placed in the app/*javascript/*packs folder and the modules can be placed inside app/*javascript folder in any way you like.
to application.js created with sprockets. // This file is automatically compiled by Webpack, along with any other files // present in this directory. You're encouraged to place your actual application // logic in a relevant structure within app/javascript and only use these pack files to // reference that code so it'll be compiled. This configuration is provided by webpacker by default.
to include the bundle generated by webpack by using a pack tag. This helper method is provided by webpacker and takes care of inserting the JavaScript into our page similar to javascript_link_tag
precompile assets from asset pipeline. Webpacker adds webpacker:compile task to the assets:precompile task. It gets run every time you run assets:precompile.
features of webpack. This feature allows you to split your code into various bundles which can then be loaded on demand or in parallel. It can be used to achieve smaller bundles and control resource load prioritization which, if used correctly, can have a major impact on load time. This also works with web packer as it allows multiple entry points.
to invest some time in learning webpack. It is not one to one mapping between assets and webpack. When to use webpacker and when to use sprockets. What web pack brings to the table Modularization
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