These Rails apps are overpacking their JavaScript bundles

A case study of Rails applications making a common Webpacker mistake of rendering modules multiple times on a single page. We'll describe why the problem happens and present a Webpacker Packing Checklist for proper code-splitting.

A visual guide to Webpacker

Navigate the world of Webpacker and webpack on Rails with confidence using this collection of mental maps I put together.

The webpack plugin I can't live without

In this post, we'll take a look at installing and using the webpack-bundle-analyzer, perhaps the most invaluable webpack plugin, to analyze and debug the output of the webpack build in a Rails project configured to use Webpacker.

Why does Rails 6 include both Webpacker and Sprockets?

A new Rails 6 application will install both Webpacker and Sprockets by default. Don't they solve the same problem? This article dives into why Sprockets lives on even though webpack has surpassed most of its features and why you might want to choose one over the other.

How to debug webpack on Rails

Understanding your Rails webpack configuration and build output can be a little confusing, especially if you're new to either Rails or webpack. This post contains a few tips for debugging your Webpacker setup, some specific to Rails Webpacker, some generally applicable to webpack.

How to customize webpack in Rails apps

Configuring webpack is precisely the main job of Webpacker's NPM package, @rails/webpacker. This post provides an overview of how to customize its default settings for your Rails application.

Understanding webpacker.yml

Configuring Webpacker can be a daunting task. In this guide, we will take a look at the options provided via the webpacker.yml file and supported environment variable overrides.

jQuery plugins in webpack without jQuery

Upgrading jQuery plugins to work with webpack is a common source of confusion. If you're lucky, you may find they can work in either context such that you might not need jQuery at all.

25 reasons to switch to Webpack(er)

There are plenty of great reasons to switch to Webpacker, including improvements in supported syntax, development tooling, performance optimizations, and more. For Rails developers considering the upgrade from the Rails asset pipeline, start here.

A guide to NPM version constraints for Rubyists

A reference guide to NPM version constraints for dependencies declared in the package.json file of a Rails project from the perspective of a Ruby developer familiar with similar conventions used to specify Ruby dependencies in a Gemfile.

3 ways webpack surprises web developers

When I first started working with webpack, I was in for a few surprises. I assumed how things should behave, based on my previous experience with the Rails asset pipeline, only to learn through experience how I was wrong.

Importing images with Webpacker

Using images bundled by webpack can get confusing. 'How to reference images from JavaScript? from CSS? from Rails ERB templates? This post will demonstrate.

Overpacking: A common Webpacker mistake

A big issue that comes up with Webpacker is "where to put the JavaScript files". This post demonstrates proper use of entry point files, called packs, with Webpacker and Rails and will help developers avoid a common gotcha.

How we switched from Sprockets to webpack

In this post, we describe the challenges we faced while replacing the Rails asset pipeline with webpack, how we solved those issues, and what we learned along the way.

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