Craft Commerce 2 Extend Snapshots

module.php

Event::on(LineItems::class, LineItems::EVENT_POPULATE_LINE_ITEM, function (LineItemEvent $event) {
    $purchasable = $event->lineItem->purchasable;
    $lineItem = $event->lineItem;

    $productImageUrl = '';
    $imageOptimize = [];

    if (count($purchasable->product->productImage) > 0) {
        $productImageUrl = $purchasable->product->productImage->one()->getUrl();
        if (Craft::$app->plugins->isPluginInstalled('image-optimize')) {
            $imageOptimizeField = $purchasable->product->productImage->one()->imageOptimize;
            $imageOptimize = $imageOptimizeField;
        }
    }

    $lineItem->snapshot = array_merge(
        $lineItem->snapshot,
        [
            'productImageUrl' => $productImageUrl,
            'productImageOptimize' => $imageOptimize,
        ]
    );

});