PackageFactory.AtomicFusion.CssModules

CSS Modules for Atomic.Fusion

Why?

Atomic.Fusion enables you to implement a frontend component architecture in Neos.Fusion. In similar environments (like React or Vue.js), CSS Modules have been proven to be a robust solution to avoid CSS global namespace issues and to make your styles portable alongside your components.

To enable this technology felt like a natural extension to the ecosystem of Atomic.Fusion.

What do CSS modules do?

In short: CSS Modules convert your CSS class names and other global identifiers (like @keyframes) into unique identifiers. When processing your CSS files, a JSON file is created, that maps the original class name to the new unique one.

This way it is ensured, that you can always use speaking identifiers that make sense in the context of your component, without having to worry about potential global naming conflicts.

PackageFactory.AtomicFusion.CssModules helps you to include those *.json files at the right place. It expects them to be present alongisde your Fusion components already - it won't generate them.

In order to generate CSS Module files, you have to configure your frontend build pipeline accordingly. An example of how this could look like is given in the next section.

Setting up CSS modules

The following describes an example setup for postcss and postcss-modules. This is not the only way to create such a setup. For further information on this, I suggest you have a look at the postcss-cli and postcss-modules repositories.

CSS modules require Node JS and two essential dependencies. Make sure, Node JS is available to your set up and that you have a valid package.json file at the root of your repository (or whereever you prefer it to reside).

Then install the following packages:

yarn add --dev postcss postcss-modules

This example also uses postcss-cli:

yarn add --dev postcss-cli

Then create a postcss.config.js in the same directory as your package.json:

module.exports = {
    plugins: [
        require('postcss-modules')
    ]
}

Create a Makefile containing a recipe for building your CSS in the same directory as your package.json:

SHELL=/bin/bash
export PATH := $(PATH):./node_modules/.bin
export SITE_PACKGE_DIR="./Packages/Sites/Vendor.Site"

build-css:
	# Build CSS with postcss
	postcss \
		${SITE_PACKGE_DIR}/Resources/Private/Fusion/**/*.css \
		--dir ${SITE_PACKGE_DIR}/Resources/Public/Styles/temp
	# Concat all built CSS files
	cat ${SITE_PACKGE_DIR}/Resources/Public/Styles/temp/* > ${SITE_PACKGE_DIR}/Resources/Public/Styles/main.css
	# Remove temporary CSS files
	rm -rf ${SITE_PACKGE_DIR}/Resources/Public/Styles/temp

When you run make build-css, all *.css files you have placed alongside your *.fusion component files will afterwards be accompanied by a corresponding *.css.json file containing the map mentioned above.

Usage in Fusion

Consider the following css file (let's say Vendor.Site/Resources/Private/Fusion/MyComponent/MyComponent.css):

.myComponent {
	display: block;
}

.isActive {
	background-color: blue;
}

After running make build-css, a file Vendor.Site/Resources/Private/Fusion/MyComponent/MyComponent.css.json should appear.

In your Vendor.Site/Resources/Private/Fusion/MyComponent/MyComponent.fusion file, you can now access the class names like this:

prototype(Vendor.Site:MyAwesomeComponent) < prototype(PackageFactory.AtomicFusion:Component) {
	# Fusion
	renderer = Neos.Fusion:Tag {
		attributes.class = ${AtomicFusion.classNames(styles.myComponent, props.isActive && styles.isActive)}
	}

	# AFX
	renderer = afx`
		<div
			class={AtomicFusion.classNames(
				styles.myComponent,
				props.isActive && styles.isActive
			)}
			>
		</div>
	`
}

Notice that within your components renderer path, you can now access a special styles context, that contains the class name map.

Side note: AtomicFusion.classNames is a helper method to concatenate class names conditionally. More on this can found in the Atomic.Fusion main repository.

Discovery of CSS module files

Fusion actually holds no information about the file a prototype is defined in. So, to enable the discovery of files put alongside those component *.fusion files, we need to configure a lookup pattern:

PackageFactory:
  AtomicFusion:
    CssModules:
      tryFiles:
        - resource://{packageKey}/Private/Fusion/{componentPath}.css.json

With the above configuration the CSS module file for the prototype prototype(Vendor.Site:MyAwesomeComponent) will be assumed as resource://Vendor.Site/Private/Fusion/MyAwesomeComponent.css.json.

{packageKey} and {componentPath} are variables that will be replaced with runtime information of the respective fusion prototype.

The following variables are considered:

{prototypeName} - The entire prototype name
{packageKey} - The part of the prototype name before the :
{componentName} - The part of the prototype name after the :
{componentBaseName} - The last part of the componentName, if seperated by dots (for Vendor.Site:Atom.Button that would be: Button)
{componentPath} - Similar to {componentName} with all dots being replaced by Directory Separators.

By default, the package looks at the following patterns:

resource://{packageKey}/Private/Fusion/{componentPath}.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/{componentBaseName}.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/style.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/Style.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/styles.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/Styles.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/index.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/Index.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/component.css.json
resource://{packageKey}/Private/Fusion/{componentPath}/Component.css.json

Caveats

Recently, the native component prototype Neos.Fusion:Component has arrived in the Neos.Fusion core. Unfortunately, this package won't work with this new prototype and relies on PackageFactory.AtomicFusion:Component to be present.

This will likely change in the future, either through this package or a PR to Neos.Fusion.

If you still want to use this package with an existing code base, that relies on Neos.Fusion:Component, you could replace the Neos.Fusion:Component standard implementation with the one for PackageFactory.AtomicFusion:Component:

prototype(Neos.Fusion:Component) {
    @class = 'PackageFactory\\AtomicFusion\\FusionObjects\\ComponentImplementation'
}

PackageFactory.AtomicFusion:Component is fully compatible to Neos.Fusion:Component, but you should be nonetheless aware:

THIS IS NOT THE JEDI WAY!

License

see LICENSE.md

License

PackageFactory/atomic-fusion-cssmodules

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