Hyvä Module Compatibility Skill

Overview

This skill helps identify and fix Magento 2 module compatibility issues with Hyvä Themes. Hyvä uses Alpine.js and TailwindCSS instead of Luma's Knockout.js and RequireJS, which often breaks modules designed for the default Luma theme.

When to Use This Skill

• A Magento 2 module works in admin but not on Hyvä frontend
• Plugins targeting Magento blocks don't apply on frontend
• JavaScript-based features are missing or broken
• Custom rendering/UI components don't appear correctly

Common Hyvä Compatibility Issues

1. Block Plugins Don't Execute

Symptom: Plugins that modify block HTML output (e.g.,

after*Html()

methods) don't apply on frontend.

Root Cause: Hyvä often uses custom ViewModels and templates that bypass standard Magento blocks.

Example from this project:

// ❌ This plugin doesn't work with Hyvä
class SelectPlugin {
    public function afterGetValuesHtml(Select $subject, string $result): string {
        // Modifies HTML - but Hyvä doesn't call getValuesHtml()
    }
}

Solution: Instead of plugins, use:

• Template overrides in your theme
• Custom ViewModels injected via

  ViewModelRegistry

• Alpine.js for client-side rendering

2. RequireJS/Knockout Dependencies

Symptom: JavaScript features don't load; console errors about missing modules.

Root Cause: Hyvä doesn't include RequireJS or Knockout.js by default.

Solution:

• Replace RequireJS modules with vanilla JavaScript or Alpine.js
• Use

  <script>

  tags with modern ES6+ JavaScript
• Leverage Hyvä's ViewModels for data injection

3. Layout XML Blocks Not Rendering

Symptom: Blocks defined in layout XML don't appear on frontend.

Root Cause: Hyvä templates may not include the block reference points.

Solution:

• Check if Hyvä has an equivalent template
• Override Hyvä templates in your theme to add missing blocks
• Use

  $block->getChildHtml()

  in templates

Hyvä Compatibility Workflow

Step 1: Identify the Issue

# Test in admin first (should work)
# Then test on frontend with Hyvä theme

# Check browser console for errors
# Check var/log/system.log for PHP errors

# Verify theme is actually Hyvä
bin/magento theme:list

Step 2: Locate the Incompatible Code

Check for these patterns:

// ❌ Block HTML modification plugins
public function afterGetHtml(...) {}
public function afterToHtml(...) {}

// ❌ RequireJS dependencies
<script type="text/x-magento-init">
require(['jquery', 'mage/...'], function($) {});

// ❌ Knockout.js data-bind
<div data-bind="scope: 'component'">

Find Hyvä equivalents:

# Search Hyvä theme templates
find vendor/hyva-themes -name "*.phtml" | xargs grep -l "pattern"

# Check if Hyvä has a compatibility module
ls app/code/Hyva/*/

Step 3: Implement Hyvä-Compatible Solution

Pattern A: Template Override with ViewModel

File:

app/design/frontend/YourVendor/your-theme/Module_Name/templates/your-template.phtml

<?php
use Hyva\Theme\Model\ViewModelRegistry;
use Your\Module\ViewModel\YourViewModel;

/** @var ViewModelRegistry $viewModels */
$viewModels = $viewModels ?? \Magento\Framework\App\ObjectManager::getInstance()
    ->get(ViewModelRegistry::class);

/** @var YourViewModel $customViewModel */
$customViewModel = $viewModels->require(YourViewModel::class);

// Get data from ViewModel
$data = $customViewModel->getData();
?>

<!-- Use Alpine.js for interactivity -->
<div x-data="{
    myData: <?= $escaper->escapeHtmlAttr(json_encode($data)) ?>,
    myMethod() {
        // Alpine.js method
    }
}" x-init="myMethod()">
    <span x-text="myData.someValue"></span>
</div>

Pattern B: Alpine.js Integration

When: You need client-side reactivity (dropdowns, filters, dynamic updates)

// In your template .phtml file
<script>
function initYourFeature() {
    return {
        // Data properties
        selectedValue: null,
        options: <?= /* @noEscape */ json_encode($options) ?>,

        // Initialization
        init() {
            this.$nextTick(() => {
                this.applyDefaults();
            });
        },

        // Methods
        applyDefaults() {
            // Set default values
            if (this.defaultValue) {
                this.selectedValue = this.defaultValue;
                // Update DOM
                const element = document.querySelector('#my-select');
                if (element) {
                    element.value = this.defaultValue;
                }
            }
        },

        // Event handlers
        handleChange($dispatch, value) {
            this.selectedValue = value;
            $dispatch('custom-event', { value });
        }
    }
}
</script>

<div x-data="initYourFeature()" x-init="init()">
    <select x-on:change="handleChange($dispatch, $event.target.value)">
        <template x-for="option in options">
            <option :value="option.value" x-text="option.label"></option>
        </template>
    </select>
</div>

Pattern C: ViewModel for Data Preparation

File:

app/code/Your/Module/ViewModel/YourViewModel.php

<?php
declare(strict_types=1);

namespace Your\Module\ViewModel;

use Magento\Framework\View\Element\Block\ArgumentInterface;

class YourViewModel implements ArgumentInterface
{
    private $yourModel;

    public function __construct(
        \Your\Module\Model\YourModel $yourModel
    ) {
        $this->yourModel = $yourModel;
    }

    /**
     * Get data for Alpine.js/frontend
     *
     * @param int $entityId
     * @return array
     */
    public function getData(int $entityId): array
    {
        return [
            'key' => 'value',
            'items' => $this->yourModel->getItems($entityId),
        ];
    }

    /**
     * Get data as JSON for Alpine.js
     *
     * @param int $entityId
     * @return string
     */
    public function getDataJson(int $entityId): string
    {
        return json_encode($this->getData($entityId), JSON_THROW_ON_ERROR);
    }
}

Usage in template:

<?php
/** @var Your\Module\ViewModel\YourViewModel $viewModel */
$viewModel = $viewModels->require(\Your\Module\ViewModel\YourViewModel::class);
?>

<div x-data='<?= $viewModel->getDataJson($product->getId()) ?>'>
    <!-- Your Alpine.js component -->
</div>

Step 4: Testing

# Clear caches
ddev exec bin/magento cache:flush

# Check for errors in console
# Browser DevTools → Console

# Check for errors in logs
tail -f var/log/system.log var/log/exception.log

# Test all option types if applicable
# - Select dropdowns
# - Radio buttons
# - Checkboxes
# - Multi-select

Real-World Example: Custom Option Default Values

Original (Luma-Compatible) Approach

// Plugin: Plugin/Catalog/Block/Product/View/Options/Type/SelectPlugin.php
class SelectPlugin
{
    public function afterGetValuesHtml(Select $subject, string $result): string
    {
        // Modify HTML to add selected="selected" attribute
        // ❌ Doesn't work with Hyvä - method never called
    }
}

Hyvä-Compatible Approach

1. Created ViewModel:

// ViewModel/CustomOptionImage.php
class CustomOptionImage implements ArgumentInterface
{
    public function getDefaultValuesForProduct(int $productId): array
    {
        return $this->defaultValueResource->getDefaultValuesForProduct($productId);
    }
}

2. Modified Template:

// app/design/frontend/Uptactics/nto/Magento_Catalog/templates/product/view/options/options.phtml

use Uptactics\CustomOptionImage\ViewModel\CustomOptionImage;

/** @var CustomOptionImage $customOptionImageViewModel */
$customOptionImageViewModel = $viewModels->require(CustomOptionImage::class);

$defaultValues = $customOptionImageViewModel->getDefaultValuesForProduct((int)$product->getId());

3. Added Alpine.js Logic:

function initOptions() {
    return {
        defaultValues: <?= /* @noEscape */ json_encode($defaultValues) ?>,

        applyDefaultValues($dispatch) {
            Object.entries(this.defaultValues).forEach(([optionId, optionTypeId]) => {
                const selectElement = document.querySelector(`select[name="options[${optionId}]"]`);
                if (selectElement) {
                    selectElement.value = optionTypeId;
                    this.updateCustomOptionValue($dispatch, optionId, selectElement);
                }
            });
        }
    }
}

4. Called on Initialization:

<div x-data="initOptions()"
     x-init="$nextTick(() => { applyDefaultValues($dispatch); })">

Hyvä Theme Patterns Reference

Alpine.js Directives

<!-- Data binding -->
<div x-data="{ count: 0 }"></div>

<!-- Conditionals -->
<div x-show="isVisible"></div>
<div x-if="shouldRender"></div>

<!-- Loops -->
<template x-for="item in items" :key="item.id">
    <div x-text="item.name"></div>
</template>

<!-- Events -->
<button x-on:click="handleClick()">Click</button>
<select x-on:change="handleChange($event)">

<!-- References -->
<div x-ref="myElement"></div>
<!-- Access via this.$refs.myElement -->

<!-- Initialization -->
<div x-init="init()"></div>

<!-- Lifecycle -->
<div x-init="$nextTick(() => { /* code */ })"></div>

ViewModelRegistry Usage

// In templates
/** @var ViewModelRegistry $viewModels */

// Require a ViewModel
$myViewModel = $viewModels->require(MyViewModel::class);

// Check if ViewModel exists
if ($viewModels->has(MyViewModel::class)) {
    $myViewModel = $viewModels->require(MyViewModel::class);
}

Data Passing Patterns

// Simple data (use escapeHtmlAttr for attributes)
<div x-data='{ value: "<?= $escaper->escapeHtmlAttr($value) ?>" }'></div>

// Complex data (use json_encode)
<div x-data='<?= $escaper->escapeHtmlAttr(json_encode($data)) ?>'></div>

// Don't escape JSON in JavaScript context
<script>
const data = <?= /* @noEscape */ json_encode($data) ?>;
</script>

Common Gotchas

1. ViewModels Must Implement ArgumentInterface

// ✅ Correct
class MyViewModel implements ArgumentInterface { }

// ❌ Wrong - won't work
class MyViewModel { }

2. JSON Encoding for Alpine.js

// ✅ Correct - no escaping in JavaScript context
defaultValues: <?= /* @noEscape */ json_encode($defaults) ?>,

// ❌ Wrong - breaks JSON
defaultValues: <?= $escaper->escapeHtml(json_encode($defaults)) ?>,

3. Alpine.js Method Context

// ✅ Correct - use arrow function to preserve 'this'
x-init="$nextTick(() => { this.myMethod() })"

// ❌ Wrong - 'this' refers to wrong context
x-init="$nextTick(function() { this.myMethod() })"

4. Template Override Location

app/design/frontend/
  └── YourVendor/
      └── your-theme/
          └── Magento_Catalog/          ← Module name
              └── templates/
                  └── product/
                      └── view/
                          └── options/
                              └── options.phtml

Checklist for Hyvä Compatibility

• Module works in admin (sanity check)
• Identified incompatible code (plugins, RequireJS, Knockout)
• Found Hyvä equivalent templates
• Created ViewModel for data preparation (if needed)
• Created template override with Alpine.js
• Tested on frontend with Hyvä theme
• Tested all variations (dropdowns, radios, checkboxes)
• Checked browser console for errors
• Checked var/log for PHP errors
• Performance tested (no N+1 queries in ViewModel)

Resources

Hyvä Documentation

• Official docs: https://docs.hyva.io
• Alpine.js docs: https://alpinejs.dev
• Hyvä compatibility modules: https://gitlab.hyva.io/hyva-themes/magento2-hyva-checkout

Hyvä Theme Locations

• Base theme:

  vendor/hyva-themes/magento2-default-theme/

• Theme module:

  vendor/hyva-themes/magento2-theme-module/

• Your theme:

  app/design/frontend/YourVendor/your-theme/

Common Hyvä ViewModels

• Hyva\Theme\ViewModel\CustomOption

  - Custom options rendering

• Hyva\Theme\ViewModel\ProductPage

  - Product page utilities

• Hyva\Theme\ViewModel\ProductPrice

  - Price formatting

• Hyva\Theme\ViewModel\SvgIcons

  - Icon rendering

Tips

1. Start with Hyvä's templates - Always check if Hyvä has a template for what you're modifying
2. Use ViewModels for logic - Keep templates clean, put logic in ViewModels
3. Leverage Alpine.js - Don't fight it, use it for reactivity
4. Test thoroughly - Hyvä caching can mask issues
5. Check Hyvä's compatibility module list - Someone may have already solved your problem

Example Commands

# Find Hyvä template
find vendor/hyva-themes -name "select.phtml"

# Check if ViewModel exists
grep -r "class CustomOption" vendor/hyva-themes

# Clear all caches
ddev exec bin/magento cache:flush

# Check for Alpine.js errors in browser
# Open DevTools → Console → Filter for "Alpine"