vewe/classvariance

Vewe ClassVariance, an all-PHP combined implementation of Class Variance Authority, twMerge, and Tailwind-Variants

0.2.0 2026-02-12 14:23 UTC

Requires

• php: 8.4.* || 8.5.*
• tales-from-a-dev/tailwind-merge-php: ^0.1

Requires (Dev)

• carthage-software/mago: >=1
• phpunit/phpunit: ^12.0

MIT

• iamDadmin

• php
• css
• tailwind
• tailwindcss
• cva
• utility-css
• twmerge
• tailwind-variants

README

About

Aiming to be an all-PHP combined implementation of Class Variance Authority, twMerge, and Tailwind-Variants.

Supporting the current version of PHP, less one, as a minimum requirement, to keep the package freshly maintained and utilising the latest features of PHP.

Version Strategy

Based on semantic versioning, with the following constraints

• 1.x.x releases support PHP8.4, PHP8.5
• 2.x.x releases support PHP8.5, PHP8.6
• 3.x.x releases support PHP8.6, PHP-Next (tbc)

Major point releases may introduce breaking changes, which will be in the release notes.

Minor point releases should be non-breaking changes and fixes.

Installation

You can install the package via composer:

composer require vewe/classvariance

Usage

Cv, with slots, akin to Tailwind-Variants

You can declare your classes as a single string, space delimited, or you can provided it as an array of strings, or a mix of the two methods, as suits your needs.

When using slots, always declare a 'base' slot consistently in the Cv::new definition. Unlike Tailwind-Variants, Cv does not assume which classes are meant for which slot, you must be declarative.

This is a conscious design decision, as your definition should have an immutable source of truth, instead of relying on script defaults which could change over time.

use Vewe\ClassVariance\Cv;

 $button = Cv::new(
    [
        'base' => ['font-semibold', 'border', 'rounded'],
        'label' => [''],
    ],
    [
        'variants' => [
            'color' => [
                'primary' => [
                    'base' => [
                        'bg-blue-500',
                        'border-transparent',
                        'hover:bg-blue-600'
                    ],
                    'label' => ['text-white'],
                ],
                'secondary' => [
                    'base' => [
                        'bg-white',
                        'border-gray-400',
                        'hover:bg-gray-100'
                    ],
                    'label' => ['text-black'],
                ],
            ],
            'size' => [
                'small' => [
                    'base' => ['py-1', 'px-2'],
                    'label' => ['text-sm'],
                ],
                'medium' => [
                    'base' => ['py-2', 'px-4'],
                    'label' => ['text-base'],
                ],
            ],
        ],
        'compoundVariants' => [
            [
                'color' => 'primary',
                'size' => 'medium',
                'class' => [
                    'label' => 'uppercase',
                ],
            ],
        ],
        'defaultVariants' => [
            'color' => 'primary',
            'size' => 'medium',
        ],
    ],
);

When you don't specify a slot, it defaults to returning the 'base' slot

<button class="<?= $button(); ?>">Button, assumes default slot of 'base'</button>

You can use named properties or you can pass an empty array for $props.

<button class="<?= $button(slot: 'base'); ?>">Button, specifies slot 'base'</button>

<button class="<?= $button([], 'base'); ?>">Button, specifies slot 'base'</button>

You can also take advantage of Tailwind-Variants style declarations, for your component to have multiple sub-components.

<button class="<?= $button(props: ['color' => 'secondary', 'size' => 'small']); ?>">
    <span class="<?= $button(
        props: ['color' => 'secondary', 'size' => 'small'],
        slot: 'label'); ?>">
    Submit
    </span>
</button>

Tip

Looking for a comprehensive set of components using Cv? Take a look at vewe/ui! Ready for use with TempestPHP or adapt to anything you like.

Cv, without slots

When not using slots, simply omit them from your definitions entirely.

use Vewe\ClassVariance\Cv;

$button = Cv::new(
    ['font-semibold', 'border', 'rounded'],
    [
        'variants' => [
            'color' => [
                'primary' => [
                    'bg-blue-500',
                    'text-white',
                    'border-transparent',
                    'hover:bg-blue-600'
                ],
                'secondary' => 'bg-white text-gray-800 border-gray-400 hover:bg-gray-100',
            ],
            'size' => [
                'small' => ['text-sm', 'py-1', 'px-2'],
                'medium' => 'text-base py-2 px-4',
            ],
        ],
        'compoundVariants' => [
            [
                'color' => 'primary',
                'size' => 'medium',
                'class' => 'uppercase',
            ],
        ],
        'defaultVariants' => [
            'color' => 'primary',
            'size' => 'medium',
        ],
    ],
);

Equally, do not pass the slot property at all.

<button class="<?= $button(); ?>">The</button>

<button class="<?= $button(['color' => 'primary', 'size' => 'medium']); ?>">Same</button>

<button class="<?= $button(props: ['color' => 'primary', 'size' => 'medium']); ?>">Button</button>

Merging additional class data

Whether or not you implement slots configuration, if you wish to pass additional classes to be merged one-off into a specific button, you can pass it in either class or className within $props.

<button
    class="<?= $button(props: ['color' => 'secondary', 'size' => 'small'], slot: 'base'); ?>">
    <span
        class="<?= $button(
            props: ['color' => 'secondary', 'size' => 'small'],
            slot: 'label'); ?>">
    Submit
    </span>
</button>

<button class="<?= $button(props: ['color' => 'secondary', 'size' => 'small']); ?>">Submit</button>

<button
    class="<?= $button(
        props: ['class' => 'border-red-600', 'color' => 'secondary', 'size' => 'small'],
        slot: 'base'); ?>">
    <span
        class="<?= $button(
            props: ['class' => 'text-italic', 'color' => 'secondary', 'size' => 'small'],
            slot: 'label'); ?>">
    Red-border Italic Submit
    </span>
</button>

<button
    class="<?= $button(
        props: ['class' => 'border-red-600 text-italic', 'color' => 'secondary', 'size' => 'small']); ?>">
Red-border Italic Submit
</button>

Testing

composer phpunit

Credits and Acknowledgements

A special thank you to the following, without whom this package would not exist.

• Cv began as a heavily-modified fork of featureninja/cva by Roj Vroemen and contributors
• In turn this was based on Class Variance Authority by Joe Bell

Also a thank you to the following projects, whose own ideas helped shape Cv.

• Tailwind-Variants by Junior Garcia @jrgarciadev, Tianen Pang @tianenpang and contributors
• Tailwind-merge by Romain Monteil which is based on Tailwind-merge-php by Sandro Gehri and contributors

License

The MIT License (MIT). Please see License File for more information.