Function confirmOptimistic

packages/app/src/context/server-session.ts:316–332

(sessionID: string, messageID: string, confirmedParts: Part[])

  }

  const confirmOptimistic = (sessionID: string, messageID: string, confirmedParts: Part[]) => {
    const items = optimistic.get(sessionID)
    const item = items?.get(messageID)
    if (!items || !item) return
    const confirmed = new Set(confirmedParts.map((part) => part.id))
    const parts = item.parts.filter((part) => !confirmed.has(part.id))
    if (parts.length === 0) {
      clearOptimistic(sessionID, messageID)
      return
    }
    items.set(messageID, {
      ...item,
      parts,
      confirmedParts: merge(item.confirmedParts ?? [], confirmedParts),
      confirmedMessage: true,
    })
  }

  const trackPartChange = (sessionID: string, messageID: string, partID: string) => {
    const load = messageLoads.get(sessionID)