📦 Webpack Shopify Theme Development Tool

This Webpack config was created to replace Slate by Shopify. This workflow uses ThemeKit but offers you the ability to use modern JavaScript and create template specific JS and CSS bundles. While it's possible to migrate an existing theme to this workflow, the intention and real benefit comes when new themes are built from scratch using this setup. Please post general questions in the Discussions tab in GitHub.

🆕 Updated to work with Shopify's Online Store 2.0 JSON templates & "sections everywhere"

New features:

All .scss files created under src/styles/sections/ will be processed with node-sass and compiled to a .css file with a section. prefix (See example files in dist). These files will be bundled into dist/assets.
Note: Shopify's preferred method of including section file css is to add a liquid stylesheet tag at the top fo each section file. See example section file (Approach taken from the new Dawn theme).
JSON templates will now be ignored by ThemeKit via the config.yml file. This is due to the fact that section setting content is stored within the template.json file. Allowing ThemeKit to push new versions of this file would overwrite any changes made in section settings from the theme customizer. If you use a deployment tool like Buddy or Beanstalk, be sure to add templates/*.json as an ignore there as well.

🖥 System Requirements

Node (v14.*+)
NPM 5+
Theme Kit

🎬 Getting Started

In a new project directory, run Theme Kit's 'new' command to generate a new theme on your store. After that theme has been uploaded to your store, delete the new local theme files that Theme Kit downloaded to your directory as you won't need them. The starter liquid files included dist/ are the same files you'll get when generating a new theme with Theme Kit.
Download and unzip this repo, and move all files into your new directory created in step 1.
Open terminal, cd into your project directory, and and run npm install to install packages.
In Shopify, copy the theme ID for the new theme, then update the <PASSWORD>, THEME_ID, and STORE_URL in config.yml with your store & theme details.

Your config.yml file should look like this:

development:
  password: <PRIVATE_APP_PASSWORD>
  theme_id: "<THEME_ID>"
  store: <STORE_URL>
  directory: dist/
  ignore_files:
    - config/settings_data.json

If migrating an existing theme, copy over all assets, liquid and config files from your theme into their respective directories in src/.
Run npm start to run your first Webpack build and start watching for file changes to be uploaded to Shopify.

⚙️ Configuration

NPM

Scripts

npm start

Completes a Webpack build in development mode
Webpack begins watching for file changes
Theme Kit begins watching for file changes in dist/
Theme Kit opens your development theme in your default browser

npm run build

Completes a Webpack build in production mode

npm run deploy

Completes a Webpack build in production mode
Deploys dist folder to the development theme in config.yml

Webpack

Entry Points

All JavaScript files in the js/bundles directory & subdirectories are used as entry points. All other JavaScript modules should added to additional subdirectories of js/. An entry point file must be created for each liquid template file, including alternate templates. A CSS file for each template and layout should also be added to styles/layout and styles/templates. These CSS files should be imported at the top of each JavaScript entry file.

Output Files

Webpack will generate a JavaScript file for each template and layout file in the bundles directory. The CSS files imported in each bundle entry file will also generate CSS files. Webpack will add all output files to dist/assets.

Theme Kit

Config

The Theme Kit configuration file uses dist as the root directory for watching files to upload.

File Uploads

When running npm start, Webpack will use a plugin that runs shopify-themekit watch after a successful build. Webpack will then watch and recompile entry file changes, and Theme Kit will watch for file changes in the dist directory.

‼️ Required Files

The layout and template entry files in src/js/bundles/ are necessary for Webpack to generate the CSS and JavaScript assets for each layout and template. Additional entry files will be required when creating new liquid templates or alternate templates, ie. page.about.js.
The style-bundle.liquid and script-bundle.liquid snippets output dynamic asset URLs based on current layout and template. These have been added to sample theme.liquid. The layout variable is required.

Shopify Plus Stores

If your store is on Shopify Plus, you'll need to do the following:

Create checkout.scss and add to src/styles/layout/.
Create checkout.js and add to src/js/bundles/layout/.
Add import "Styles/layout/checkout.scss"; in checkout.js.
Render the style-bundle and script-bundle snippets in checkout.liquid by changing the snippet's layout variable value to checkout. ie. {% render 'style-bundle', layout: 'checkout' %} and {% render 'script-bundle', layout: 'checkout' %}.

📝 Notes

Subdirectories are allowed in assets/, js/, styles/, snippets/.
A Styles module alias for the styles directory is ready to use. ie. import "Styles/layout/theme.scss".
To reference an asset url in an SCSS file such as a background image, just use ./filename.ext, since all final CSS and images live in the dist/assets/ directory.
If you add a new JavaScript entry file to js/bundles/ while Webpack and Theme Kit are watching for changes, you'll need to end the process and run npm start again so that Webpack is aware of the new entry file.
A git pre-commit hook is installed that will run webpack build prior to the commit. This is useful if using a code deployment tool so that you never push and deploy an unbuilt theme.
clean-webpack-plugin was intentionally not included to make incremental deployments faster using Buddy. If you remove a bundle entry file, you'll also need to delete the bundle files from dist/assets.
If you update or switch node versions using nvm, you will need to run npm rebuild node-sass to refresh node-sass for your current environment.
When merging 2 git feature branches, you only need to resolve the conlficts inside src/. Any conflicts inside dist/ can be resolved with npm run build. Always run npm run build after resolving merge conflicts.
Vendor CSS and JS files can be added to src/assets/vendor, and will be copied into dist/assets.

🚧 Under Construction

A few issues with this workflow that I'm working on a solution for:

If a Webpack entry file is deleted, how to also remove the generated output files from dist/assets/. The clean-webpack-plugin removes the entire dist folder which git tracks as new changes to every file in the directory, so that is not an option.
Currently, if the same vendor module is imported in a layout and template entry file, that code will be included twice. How to split out vendor file imports but also make them available in the necessary modules.

🆕 Changelog

December 26, 2021

Removes Babel. Replaces with eslint-plugin-compat & .eslintrc (only polyfill what is necessary for the browsers your project requires).
Adds defer to layout and template script bundles, and moves to <head>.

March 10, 2020

Fixes bug with account page style and JavaScript bundles. Updates the style-bundle.liquid and script-bundle.liquid snippets to remove customers/ from the asset URL output as this is not included in the filename that webpack generates.

March 23, 2020

Moves templates/, sections/, snippets/ and layout/ directories into a liquid/ directory in src/.
Updates copy plugin in webpack.config.js to accommodate the new liquid directory structure.

February 16, 2021

Adds apps.js and apps.scss. These assets will load in your theme layout JS and CSS on pages where apps run and a Shopify template is not used. (ie. ___.myshopify.com/apps/store-locator)
Updates style-bundle.liquid and script-bundle.liquid to include app.js and app.scss for template-less pages
Updates style-bundle.liquid and script-bundle.liquid to remove string filter for capturing template name and suffix
Uninstalls unnecessary npm dependencies

krjo/shopify-webpack-dev-workflow