// if you want to modify how Metrics tracks any of the default events, you can overwrite them very easily, just like this:

Metrics.addToCart = function (cartItem) {
    return {
        gtm: {
            event: 'addToCart',
            data: {
                ecommerce: {
                    add: {
                        products: [{
                            id: cartItem.variant.sku,
                            name: cartItem.variant.productName,
                            price: cartItem.variant.price,
                            variant: cartItem.variant.description,
                            quantity: cartItem.quantity
                        }]
                    }
                }
            }
        },
        analytics: {
            event: 'add_to_cart',
            data: {
                items: [{
                    id: cartItem.variant.sku,
                    name: cartItem.variant.productName,
                    variant: cartItem.variant.description,
                    quantity: cartItem.quantity,
                    price: cartItem.variant.price
                }]
            }
        },
        pixel: {
            event: 'AddToCart',
            data: {
                content_ids: [cartItem.variant.sku],
                content_type: 'product',
                content_name: cartItem.variant.name,
                contents: [{
                    id: cartItem.variant.sku,
                    quantity: cartItem.quantity,
                    item_price: cartItem.variant.price
                }]
            }
        }
    }
}