.update()

openbridge.cart.update(lineId, quantity)
openbridge.cart.update(lines)

const lines = openbridge.cart.lines()
await openbridge.cart.update(lines[0].id, 5)

const lines = openbridge.cart.lines()

await openbridge.cart.update([
    { id: lines[0].id, quantity: 2 },
    { id: lines[1].id, quantity: 4 }
])

document
    .querySelector('.quantity-input')
    .addEventListener('change', async (e) => {
        const lineId = e.target.dataset.lineId
        const quantity = parseInt(e.target.value)

        if (quantity > 0) {
            await openbridge.cart.update(lineId, quantity)
        }
    })

async function updateQuantity(lineId, delta) {
    const line = openbridge.cart.lines().find((l) => l.id === lineId)
    const newQuantity = line.quantity + delta

    if (newQuantity > 0) {
        await openbridge.cart.update(lineId, newQuantity)
    } else {
        await openbridge.cart.remove(lineId)
    }
}