Magento2: How to get locale code in javascript

I found a way to add the locale code in the window object in javascript. For me the best is to add it in the window.checkout object (since there's already some information about the store) so i made a plugin of the Magento\Checkout\Block\Cart\Sidebar class.

// path: app/code/<vendor>Checkout/Plugin/Block/Cart/Sidebar.php
<?php

namespace <vendor>\Checkout\Plugin\Block\Cart;

use Magento\Checkout\Block\Cart\Sidebar as DefaultSidebar;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Store\Model\ScopeInterface;

class Sidebar
{
    protected ScopeConfigInterface $scopeConfig;

    public function __construct(
        ScopeConfigInterface $scopeConfig
    ) {
        $this->scopeConfig = $scopeConfig;
    }

    /**
     * {@inheritdoc}
     * add the `localeCode` variable in the result array
     */
    public function afterGetConfig(DefaultSidebar $subject, $result)
    {
        $storeId = $result['storeId'];
        $localeCode = $this->scopeConfig->getValue(
            'general/locale/code',
            ScopeInterface::SCOPE_STORE,
            $storeId
        );

        $result['localeCode'] = $localeCode;
        return $result;
    }
}

<!-- path: app/code/<vendor>/Checkout/etc/di.xml--> 
<?xml version="1.0" encoding="UTF-8" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<!--  ... -->
    <type name="Magento\Checkout\Block\Cart\Sidebar">
        <plugin name="<vendor>_checkout_plugin_block_cart_sidebar"
                type="<vendor>\Checkout\Plugin\Block\Cart\Sidebar" />
    </type>

</config>

With this plugin I can now get the localeCode like this :

window.checkout.localeCode