Function normalizeMessages

src/utils/messages.ts:741–823

(messages: Message[])

): (NormalizedAssistantMessage | NormalizedUserMessage)[]
export function normalizeMessages(messages: Message[]): NormalizedMessage[]
export function normalizeMessages(messages: Message[]): NormalizedMessage[] {
  // isNewChain tracks whether we need to generate new UUIDs for messages when normalizing.
  // When a message has multiple content blocks, we split it into multiple messages,
  // each with a single content block. When this happens, we need to generate new UUIDs
  // for all subsequent messages to maintain proper ordering and prevent duplicate UUIDs.
  // This flag is set to true once we encounter a message with multiple content blocks,
  // and remains true for all subsequent messages in the normalization process.
  let isNewChain = false
  return messages.flatMap(message => {
    switch (message.type) {
      case 'assistant': {
        isNewChain = isNewChain || message.message.content.length > 1
        return message.message.content.map((_, index) => {
          const uuid = isNewChain
            ? deriveUUID(message.uuid, index)
            : message.uuid
          return {
            type: 'assistant' as const,
            timestamp: message.timestamp,
            message: {
              ...message.message,
              content: [_],
              context_management: message.message.context_management ?? null,
            },
            isMeta: message.isMeta,
            isVirtual: message.isVirtual,
            requestId: message.requestId,
            uuid,
            error: message.error,
            isApiErrorMessage: message.isApiErrorMessage,
            advisorModel: message.advisorModel,
          } as NormalizedAssistantMessage
        })
      }
      case 'attachment':
        return [message]
      case 'progress':
        return [message]
      case 'system':
        return [message]
      case 'user': {
        if (typeof message.message.content === 'string') {
          const uuid = isNewChain ? deriveUUID(message.uuid, 0) : message.uuid
          return [
            {
              ...message,
              uuid,
              message: {
                ...message.message,
                content: [{ type: 'text', text: message.message.content }],
              },
            } as NormalizedMessage,
          ]
        }
        isNewChain = isNewChain || message.message.content.length > 1
        let imageIndex = 0
        return message.message.content.map((_, index) => {
          const isImage = _.type === 'image'