{"version":3,"file":"messages.cjs","names":["#events","MultiCursorBuffer","#textPromise","#reasoningPromise","#resolveText","#resolveReasoning","#textChunks","#textWaiters","#textDone","#reasoningChunks","#reasoningWaiters","#reasoningDone","#usageIterator","#assembleMessage","AIMessage","#assembler","#activeStreaming"],"sources":["../../../src/client/stream/messages.ts"],"sourcesContent":["import {\n  AIMessage,\n  type ContentBlock as CoreContentBlock,\n  type UsageMetadata,\n} from \"@langchain/core/messages\";\nimport type { ChatModelStreamEvent } from \"@langchain/core/language_models/event\";\nimport type {\n  ContentBlock,\n  ContentBlockDelta,\n  FinalizedContentBlock,\n  MessageMetadata,\n  MessagesEvent,\n  UsageInfo,\n} from \"@langchain/protocol\";\n\nimport { MultiCursorBuffer } from \"./multi-cursor-buffer.js\";\n\ntype TextContentStream = AsyncIterable<string> &\n  PromiseLike<string> & { full: AsyncIterable<string> };\n\ntype UsageMetadataStream = AsyncIterable<UsageMetadata> &\n  PromiseLike<UsageMetadata | undefined>;\n\ntype ToolCallsStream = AsyncIterable<CoreContentBlock.Tools.ToolCall> &\n  PromiseLike<Array<CoreContentBlock.Tools.ToolCall>> & {\n    full: AsyncIterable<Array<CoreContentBlock.Tools.ToolCall>>;\n  };\n\n// Deltas are typed by the protocol, not `@langchain/core`, whose union\n// doesn't include `tool-call-delta` yet.\ntype ContentBlockDeltaEvent = Omit<\n  Extract<ChatModelStreamEvent, { event: \"content-block-delta\" }>,\n  \"delta\"\n> & { delta: ContentBlockDelta; content?: CoreContentBlock };\n\ntype ToolCallChunkBlock =\n  | CoreContentBlock.Tools.ToolCallChunk\n  | CoreContentBlock.Tools.ServerToolCallChunk;\n\nfunction isToolCallChunk(\n  block: CoreContentBlock | undefined\n): block is ToolCallChunkBlock {\n  return (\n    block?.type === \"tool_call_chunk\" ||\n    block?.type === \"server_tool_call_chunk\"\n  );\n}\n\nfunction applyCoreContentDelta(\n  target: CoreContentBlock,\n  delta: CoreContentBlock\n): CoreContentBlock {\n  if (target.type !== delta.type) {\n    return structuredClone(delta);\n  }\n\n  switch (delta.type) {\n    case \"text\":\n      return {\n        ...target,\n        ...delta,\n        text: `${\"text\" in target ? target.text : \"\"}${delta.text}`,\n      } as CoreContentBlock;\n    case \"reasoning\":\n      return {\n        ...target,\n        ...delta,\n        reasoning: `${\"reasoning\" in target ? target.reasoning : \"\"}${delta.reasoning}`,\n      } as CoreContentBlock;\n    case \"tool_call_chunk\":\n    case \"server_tool_call_chunk\": {\n      const merged = { ...target, ...delta } as Record<string, unknown>;\n      if (delta.id == null && \"id\" in target && target.id != null) {\n        merged.id = target.id;\n      }\n      if (delta.name == null && \"name\" in target && target.name != null) {\n        merged.name = target.name;\n      }\n      merged.args = `${(\"args\" in target ? target.args : \"\") ?? \"\"}${delta.args ?? \"\"}`;\n      return merged as unknown as CoreContentBlock;\n    }\n    default:\n      return { ...target, ...delta } as CoreContentBlock;\n  }\n}\n\nfunction coreContentBlockFromDelta(\n  delta: ContentBlockDelta,\n  current?: CoreContentBlock\n): CoreContentBlock | undefined {\n  switch (delta.type) {\n    case \"text-delta\":\n      return { type: \"text\", text: delta.text } as CoreContentBlock;\n    case \"reasoning-delta\":\n      return {\n        type: \"reasoning\",\n        reasoning: delta.reasoning,\n      } as CoreContentBlock;\n    case \"data-delta\": {\n      const merged = { ...(current ?? {}), data: delta.data } as Record<\n        string,\n        unknown\n      >;\n      if (delta.encoding) merged.encoding = delta.encoding;\n      return merged as unknown as CoreContentBlock;\n    }\n    case \"block-delta\":\n      return delta.fields as CoreContentBlock;\n    case \"tool-call-delta\":\n      // Without the block's start there's no id or name to attach the\n      // slice to; `content-block-finish` delivers the complete call.\n      return isToolCallChunk(current)\n        ? { type: current.type, args: delta.args }\n        : undefined;\n    default:\n      // Unknown variants are ignored.\n      return undefined;\n  }\n}\n\nfunction applyCoreEventDelta(\n  current: CoreContentBlock | undefined,\n  event: ContentBlockDeltaEvent\n): CoreContentBlock | undefined {\n  if (event.content) {\n    return current\n      ? applyCoreContentDelta(current, event.content)\n      : event.content;\n  }\n\n  switch (event.delta.type) {\n    case \"text-delta\":\n      if (current?.type === \"text\") {\n        return {\n          ...current,\n          text: `${\"text\" in current ? current.text : \"\"}${event.delta.text}`,\n        } as CoreContentBlock;\n      }\n      return coreContentBlockFromDelta(event.delta, current);\n    case \"reasoning-delta\":\n      if (current?.type === \"reasoning\") {\n        return {\n          ...current,\n          reasoning: `${\"reasoning\" in current ? current.reasoning : \"\"}${event.delta.reasoning}`,\n        } as CoreContentBlock;\n      }\n      return coreContentBlockFromDelta(event.delta, current);\n    case \"data-delta\": {\n      const merged = { ...(current ?? {}) } as Record<string, unknown>;\n      merged.data = `${(merged.data as string | undefined) ?? \"\"}${event.delta.data}`;\n      if (event.delta.encoding) merged.encoding = event.delta.encoding;\n      return merged as unknown as CoreContentBlock;\n    }\n    case \"block-delta\":\n      return {\n        ...(current ?? {}),\n        ...event.delta.fields,\n      } as CoreContentBlock;\n    case \"tool-call-delta\":\n      if (!isToolCallChunk(current)) return current;\n      return {\n        ...current,\n        args: `${current.args ?? \"\"}${event.delta.args}`,\n      };\n    default:\n      return current;\n  }\n}\n\nfunction normalizeUsage(\n  usage: UsageInfo | Partial<UsageMetadata> | undefined\n): UsageMetadata | undefined {\n  if (!usage) return undefined;\n  return {\n    ...usage,\n    input_tokens: usage.input_tokens ?? 0,\n    output_tokens: usage.output_tokens ?? 0,\n    total_tokens: usage.total_tokens ?? 0,\n  };\n}\n\nfunction readRunId(data: object): string | undefined {\n  const record = data as Record<string, unknown>;\n  return typeof record.run_id === \"string\" ? record.run_id : undefined;\n}\n\nfunction readUsage(data: object): UsageInfo | undefined {\n  const usage = (data as Record<string, unknown>).usage;\n  return usage != null && typeof usage === \"object\" && !Array.isArray(usage)\n    ? (usage as UsageInfo)\n    : undefined;\n}\n\nfunction readFinishMetadata(data: object): Record<string, unknown> | undefined {\n  const record = data as Record<string, unknown>;\n  const isRecord = (value: unknown): value is Record<string, unknown> =>\n    value != null && typeof value === \"object\" && !Array.isArray(value);\n  const merged = {\n    ...(isRecord(record.responseMetadata) ? record.responseMetadata : {}),\n    ...(isRecord(record.metadata) ? record.metadata : {}),\n  };\n  return Object.keys(merged).length > 0 ? merged : undefined;\n}\n\n/**\n * Mutable view of a streamed message as message and content-block events are\n * assembled into a single structure.\n */\nexport interface AssembledMessage {\n  id: string;\n  namespace: string[];\n  blocks: ContentBlock[];\n  node?: string;\n  runId?: string;\n  usage?: UsageInfo;\n  metadata?: MessageMetadata;\n  finishMetadata?: Record<string, any>;\n  finishReason?: string;\n  error?: {\n    message: string;\n    code?: string;\n  };\n}\n\n/**\n * Symbol keys for assembler → StreamingMessage communication.\n * Module-private: invisible to external consumers, accessible to\n * {@link StreamingMessageAssembler} within this file.\n */\nconst PUSH_TEXT: unique symbol = Symbol(\"pushText\");\nconst PUSH_REASONING: unique symbol = Symbol(\"pushReasoning\");\nconst PUSH_EVENT: unique symbol = Symbol(\"pushEvent\");\nconst UPDATE_CONTEXT: unique symbol = Symbol(\"updateContext\");\nconst FINISH: unique symbol = Symbol(\"finish\");\nconst ERROR: unique symbol = Symbol(\"error\");\n\n/**\n * Live streaming view of a single message lifecycle, matching the\n * in-process `ChatModelStream` dual-interface pattern.\n *\n * - `text` / `reasoning`: iterate for streaming deltas, or await for\n *   the full concatenated string after the message completes.\n * - `usage`: promise that resolves with token usage on message-finish.\n * - `blocks`: the assembled content blocks (updated as deltas arrive).\n *\n * Created by {@link StreamingMessageAssembler} and yielded by\n * the `session.messages` lazy getter.\n */\nexport class StreamingMessage\n  implements AsyncIterable<ChatModelStreamEvent>, PromiseLike<AIMessage>\n{\n  readonly id: string;\n  readonly namespace: string[];\n  node: string | undefined;\n  readonly metadata: MessageMetadata | undefined;\n  readonly assembled: AssembledMessage;\n  readonly #events = new MultiCursorBuffer<ChatModelStreamEvent>();\n\n  #textChunks: string[] = [];\n  #reasoningChunks: string[] = [];\n  #textWaiters: Array<() => void> = [];\n  #reasoningWaiters: Array<() => void> = [];\n  #textDone = false;\n  #reasoningDone = false;\n\n  #resolveText!: (v: string) => void;\n  #resolveReasoning!: (v: string) => void;\n  readonly #textPromise: Promise<string>;\n  readonly #reasoningPromise: Promise<string>;\n\n  constructor(assembled: AssembledMessage) {\n    this.id = assembled.id;\n    this.assembled = assembled;\n    this.namespace = assembled.namespace;\n    this.node = assembled.node;\n    this.metadata = assembled.metadata;\n    this.#textPromise = new Promise<string>((r) => {\n      this.#resolveText = r;\n    });\n    this.#reasoningPromise = new Promise<string>((r) => {\n      this.#resolveReasoning = r;\n    });\n  }\n\n  get text(): TextContentStream {\n    const chunks = this.#textChunks;\n    const waiters = this.#textWaiters;\n    const getDone = () => this.#textDone;\n    let cursor = 0;\n    return {\n      [Symbol.asyncIterator]() {\n        return {\n          async next(): Promise<IteratorResult<string>> {\n            while (true) {\n              if (cursor < chunks.length) {\n                return { done: false, value: chunks[cursor++] };\n              }\n              if (getDone()) {\n                return { done: true, value: undefined };\n              }\n              await new Promise<void>((resolve) => {\n                waiters.push(resolve);\n              });\n            }\n          },\n        };\n      },\n      then: this.#textPromise.then.bind(this.#textPromise),\n      full: {\n        async *[Symbol.asyncIterator]() {\n          let accumulated = \"\";\n          for await (const chunk of {\n            [Symbol.asyncIterator]: () =>\n              ({\n                next: async (): Promise<IteratorResult<string>> => {\n                  while (true) {\n                    if (cursor < chunks.length) {\n                      return { done: false, value: chunks[cursor++] };\n                    }\n                    if (getDone()) {\n                      return { done: true, value: undefined };\n                    }\n                    await new Promise<void>((resolve) => {\n                      waiters.push(resolve);\n                    });\n                  }\n                },\n              }) satisfies AsyncIterator<string>,\n          }) {\n            accumulated += chunk;\n            yield accumulated;\n          }\n        },\n      },\n    };\n  }\n\n  get reasoning(): TextContentStream {\n    const chunks = this.#reasoningChunks;\n    const waiters = this.#reasoningWaiters;\n    const getDone = () => this.#reasoningDone;\n    let cursor = 0;\n    return {\n      [Symbol.asyncIterator]() {\n        return {\n          async next(): Promise<IteratorResult<string>> {\n            while (true) {\n              if (cursor < chunks.length) {\n                return { done: false, value: chunks[cursor++] };\n              }\n              if (getDone()) {\n                return { done: true, value: undefined };\n              }\n              await new Promise<void>((resolve) => {\n                waiters.push(resolve);\n              });\n            }\n          },\n        };\n      },\n      then: this.#reasoningPromise.then.bind(this.#reasoningPromise),\n      full: {\n        async *[Symbol.asyncIterator]() {\n          let accumulated = \"\";\n          for await (const chunk of {\n            [Symbol.asyncIterator]: () =>\n              ({\n                next: async (): Promise<IteratorResult<string>> => {\n                  while (true) {\n                    if (cursor < chunks.length) {\n                      return { done: false, value: chunks[cursor++] };\n                    }\n                    if (getDone()) {\n                      return { done: true, value: undefined };\n                    }\n                    await new Promise<void>((resolve) => {\n                      waiters.push(resolve);\n                    });\n                  }\n                },\n              }) satisfies AsyncIterator<string>,\n          }) {\n            accumulated += chunk;\n            yield accumulated;\n          }\n        },\n      },\n    };\n  }\n\n  get usage(): UsageMetadataStream {\n    const promise = (async () => {\n      let usage: UsageMetadata | undefined;\n      for await (const snapshot of this.#usageIterator()) {\n        usage = snapshot;\n      }\n      return usage;\n    })();\n    return {\n      [Symbol.asyncIterator]: () => this.#usageIterator(),\n      then: promise.then.bind(promise),\n    };\n  }\n\n  get toolCalls(): ToolCallsStream {\n    const events = this.#events;\n    const iterator = async function* () {\n      for await (const event of events) {\n        if (\n          event.event === \"content-block-finish\" &&\n          event.content.type === \"tool_call\"\n        ) {\n          yield event.content as CoreContentBlock.Tools.ToolCall;\n        }\n      }\n    };\n    return {\n      [Symbol.asyncIterator]: iterator,\n      then: async (onfulfilled, onrejected) => {\n        try {\n          const calls: CoreContentBlock.Tools.ToolCall[] = [];\n          for await (const call of iterator()) calls.push(call);\n          return onfulfilled ? onfulfilled(calls) : (calls as never);\n        } catch (err) {\n          if (onrejected) return onrejected(err);\n          throw err;\n        }\n      },\n      full: {\n        async *[Symbol.asyncIterator]() {\n          const calls: CoreContentBlock.Tools.ToolCall[] = [];\n          for await (const call of iterator()) {\n            calls.push(call);\n            yield [...calls];\n          }\n        },\n      },\n    };\n  }\n\n  get output(): PromiseLike<AIMessage> {\n    return { then: (onf, onr) => this.#assembleMessage().then(onf, onr) };\n  }\n\n  get blocks(): ContentBlock[] {\n    return this.assembled.blocks;\n  }\n\n  [Symbol.asyncIterator](): AsyncIterator<ChatModelStreamEvent> {\n    return this.#events[Symbol.asyncIterator]();\n  }\n\n  then<TResult1 = AIMessage, TResult2 = never>(\n    onfulfilled?:\n      | ((value: AIMessage) => TResult1 | PromiseLike<TResult1>)\n      | null,\n    onrejected?: ((reason: unknown) => TResult2 | PromiseLike<TResult2>) | null\n  ): PromiseLike<TResult1 | TResult2> {\n    return this.#assembleMessage().then(onfulfilled, onrejected);\n  }\n\n  async *#usageIterator(): AsyncGenerator<UsageMetadata> {\n    for await (const event of this.#events) {\n      if (event.event === \"message-start\" && event.usage) {\n        yield normalizeUsage(event.usage)!;\n      } else if (event.event === \"message-finish\" && event.usage) {\n        yield normalizeUsage(event.usage)!;\n      }\n    }\n  }\n\n  async #assembleMessage(): Promise<AIMessage> {\n    const contentBlocks: Array<CoreContentBlock | undefined> = [];\n    let id: string | undefined = this.id;\n    let usage = normalizeUsage(this.assembled.usage);\n    let metadata: Record<string, unknown> = {\n      ...(this.assembled.finishMetadata ?? {}),\n    };\n    let finishReason: string | undefined = this.assembled.finishReason;\n\n    for await (const event of this.#events) {\n      switch (event.event) {\n        case \"message-start\":\n          id = event.id ?? id;\n          if (event.usage) usage = normalizeUsage(event.usage);\n          break;\n        case \"content-block-start\":\n          contentBlocks[event.index] = event.content;\n          break;\n        case \"content-block-delta\": {\n          const current = contentBlocks[event.index];\n          contentBlocks[event.index] = applyCoreEventDelta(current, event);\n          break;\n        }\n        case \"content-block-finish\":\n          contentBlocks[event.index] = event.content;\n          break;\n        case \"message-finish\": {\n          finishReason = event.reason;\n          if (event.usage) usage = normalizeUsage(event.usage);\n          const finishMetadata = readFinishMetadata(event);\n          if (finishMetadata != null) {\n            metadata = { ...metadata, ...finishMetadata };\n          }\n          break;\n        }\n        default:\n          break;\n      }\n    }\n\n    return new AIMessage({\n      id,\n      content: contentBlocks.filter(\n        (block): block is CoreContentBlock => block != null\n      ),\n      usage_metadata: usage,\n      additional_kwargs: {\n        namespace: this.namespace,\n        ...(this.node != null ? { node: this.node } : {}),\n        ...(this.assembled.runId != null\n          ? { run_id: this.assembled.runId }\n          : {}),\n        ...(this.metadata != null ? { metadata: this.metadata } : {}),\n        ...(this.assembled.usage != null\n          ? { usage: this.assembled.usage }\n          : {}),\n      },\n      response_metadata: {\n        ...(finishReason != null ? { finish_reason: finishReason } : {}),\n        ...metadata,\n        output_version: \"v1\" as const,\n      },\n    });\n  }\n\n  [PUSH_EVENT](event: ChatModelStreamEvent): void {\n    this.#events.push(event);\n  }\n\n  [UPDATE_CONTEXT](event: MessagesEvent): void {\n    this.node = event.params.node ?? this.node;\n  }\n\n  [PUSH_TEXT](delta: string): void {\n    this.#textChunks.push(delta);\n    // Wake every caught-up iterator so each one advances its own cursor.\n    // Iterators re-check `chunks.length` before delivering, which keeps\n    // the cursor the single source of truth for what a consumer has seen.\n    const pending = this.#textWaiters.splice(0, this.#textWaiters.length);\n    for (const waiter of pending) waiter();\n  }\n\n  [PUSH_REASONING](delta: string): void {\n    this.#reasoningChunks.push(delta);\n    const pending = this.#reasoningWaiters.splice(\n      0,\n      this.#reasoningWaiters.length\n    );\n    for (const waiter of pending) waiter();\n  }\n\n  [FINISH](): void {\n    this.#textDone = true;\n    this.#reasoningDone = true;\n    this.#resolveText(this.#textChunks.join(\"\"));\n    this.#resolveReasoning(this.#reasoningChunks.join(\"\"));\n    const textPending = this.#textWaiters.splice(0, this.#textWaiters.length);\n    for (const waiter of textPending) waiter();\n    const reasoningPending = this.#reasoningWaiters.splice(\n      0,\n      this.#reasoningWaiters.length\n    );\n    for (const waiter of reasoningPending) waiter();\n    this.#events.close();\n  }\n\n  [ERROR](): void {\n    this[FINISH]();\n  }\n}\n\n/**\n * Public view yielded by message projections.\n *\n * `StreamingMessage` is PromiseLike so callers can still `await` a message\n * object directly, but TypeScript applies `Awaited<T>` to values produced by\n * `for await`. Exposing a non-thenable view keeps loop variables typed as the\n * streaming handle instead of as the finalized `AIMessage`.\n */\nexport type StreamingMessageHandle = Omit<StreamingMessage, \"then\">;\n\nexport function toStreamingMessageHandle(\n  message: StreamingMessage\n): StreamingMessageHandle {\n  return new Proxy(message, {\n    get(target, prop) {\n      if (prop === \"then\") return undefined;\n      const value = Reflect.get(target, prop, target);\n      return typeof value === \"function\" ? value.bind(target) : value;\n    },\n    has(target, prop) {\n      if (prop === \"then\") return false;\n      return prop in target;\n    },\n  }) as StreamingMessageHandle;\n}\n\n/**\n * Emitted by `MessageAssembler.consume()` to describe how a message changed in\n * response to a single protocol event.\n */\nexport type MessageAssemblyUpdate =\n  | {\n      kind: \"message-start\";\n      key: string;\n      message: AssembledMessage;\n      event: MessagesEvent;\n    }\n  | {\n      kind: \"content-block-start\" | \"content-block-delta\";\n      key: string;\n      message: AssembledMessage;\n      index: number;\n      block: ContentBlock;\n      event: MessagesEvent;\n    }\n  | {\n      kind: \"content-block-finish\";\n      key: string;\n      message: AssembledMessage;\n      index: number;\n      block: FinalizedContentBlock;\n      event: MessagesEvent;\n    }\n  | {\n      kind: \"usage\";\n      key: string;\n      message: AssembledMessage;\n      event: MessagesEvent;\n    }\n  | {\n      kind: \"message-finish\";\n      key: string;\n      message: AssembledMessage;\n      event: MessagesEvent;\n    }\n  | {\n      kind: \"message-error\";\n      key: string;\n      message: AssembledMessage;\n      event: MessagesEvent;\n    };\n\nfunction cloneBlock<T extends ContentBlock>(block: T): T {\n  return structuredClone(block);\n}\n\nfunction blockFromDelta(\n  delta: ContentBlockDelta,\n  current?: ContentBlock\n): ContentBlock | undefined {\n  return coreContentBlockFromDelta(\n    delta,\n    current as unknown as CoreContentBlock | undefined\n  ) as unknown as ContentBlock | undefined;\n}\n\nfunction applyContentDelta(\n  target: ContentBlock,\n  delta: ContentBlock\n): ContentBlock {\n  if (target.type !== delta.type) {\n    return cloneBlock(delta);\n  }\n\n  switch (delta.type) {\n    case \"text\":\n      return {\n        ...target,\n        ...delta,\n        text: `${\"text\" in target ? target.text : \"\"}${delta.text}`,\n      } as ContentBlock;\n    case \"reasoning\":\n      return {\n        ...target,\n        ...delta,\n        reasoning: `${\"reasoning\" in target ? target.reasoning : \"\"}${delta.reasoning}`,\n      } as ContentBlock;\n    case \"tool_call_chunk\":\n    case \"server_tool_call_chunk\": {\n      // Spread target first, then delta — but preserve target's\n      // ``id``/``name`` when the delta explicitly sets them to\n      // null/undefined.  Some providers (notably Anthropic via the\n      // langchain-core compat bridge) only attach the tool-call\n      // identifiers to the first ``content-block-start`` chunk; every\n      // subsequent ``input_json_delta`` chunk carries ``id=null,\n      // name=null``.  A naive ``{...target, ...delta}`` spread\n      // overwrites the captured identifiers with null, which in turn\n      // makes downstream consumers (e.g. ``extractToolCallChunks`` in\n      // ``assembled-to-message.ts``) drop the chunk on the floor until\n      // the final ``content-block-finish`` event promotes it to a\n      // finalized ``tool_call`` — causing tool-call cards to appear\n      // all-at-once at the end of the turn instead of incrementally.\n      const merged = { ...target, ...delta } as Record<string, unknown>;\n      if (delta.id == null && \"id\" in target && target.id != null) {\n        merged.id = target.id;\n      }\n      if (delta.name == null && \"name\" in target && target.name != null) {\n        merged.name = target.name;\n      }\n      merged.args = `${(\"args\" in target ? target.args : \"\") ?? \"\"}${delta.args ?? \"\"}`;\n      return merged as unknown as ContentBlock;\n    }\n    default:\n      return {\n        ...target,\n        ...delta,\n      } as ContentBlock;\n  }\n}\n\nfunction messageKeyFor(event: MessagesEvent): string {\n  const { namespace, node, data } = event.params;\n  const namespaceKey = namespace.join(\"/\");\n  const runId = readRunId(data);\n  const messageId = data.event === \"message-start\" ? (data.id ?? \"\") : \"\";\n  return `${namespaceKey}::${node ?? \"\"}::${runId ?? messageId}`;\n}\n\nfunction toChatModelStreamEvent(event: MessagesEvent): ChatModelStreamEvent {\n  return event.params.data as unknown as ChatModelStreamEvent;\n}\n\n/**\n * Incrementally assembles `messages` events into complete message objects.\n */\nexport class MessageAssembler {\n  private readonly activeMessages = new Map<string, AssembledMessage>();\n  private readonly activeByNamespaceNode = new Map<string, string>();\n  private readonly blockIndexByProtocolIndexAndType = new Map<string, number>();\n\n  /**\n   * Applies a single message event and returns the resulting assembly update.\n   *\n   * Returns `undefined` when the event changes nothing, such as a delta\n   * variant this version doesn't recognise. Those are ignored so that a\n   * newer producer can't break the stream; `content-block-finish` still\n   * carries the complete block.\n   *\n   * @param event - Incoming `messages` event to fold into the assembler state.\n   */\n  consume(event: MessagesEvent): MessageAssemblyUpdate | undefined {\n    const data = event.params.data;\n    const namespaceNodeKey = `${event.params.namespace.join(\"/\")}::${event.params.node ?? \"\"}`;\n    const runId = readRunId(data);\n\n    if (data.event === \"message-start\") {\n      const key = messageKeyFor(event);\n      this.activeByNamespaceNode.set(namespaceNodeKey, key);\n      const message: AssembledMessage = {\n        id: data.id,\n        namespace: [...event.params.namespace],\n        node: event.params.node,\n        runId,\n        usage: readUsage(data),\n        metadata: data.metadata,\n        blocks: [],\n      };\n      this.activeMessages.set(key, message);\n      return { kind: \"message-start\", key, message, event };\n    }\n\n    const runKey = runId != null ? `${namespaceNodeKey}::${runId}` : undefined;\n    const fallbackKey = this.activeByNamespaceNode.get(namespaceNodeKey);\n    const fallbackMessage =\n      fallbackKey != null ? this.activeMessages.get(fallbackKey) : undefined;\n    const activeKey =\n      (runKey != null && this.activeMessages.has(runKey)\n        ? runKey\n        : undefined) ??\n      (runId == null || fallbackMessage?.runId == null\n        ? fallbackKey\n        : undefined);\n    if (!activeKey) {\n      // A continuation event (delta/finish/error) arrived without a\n      // prior `message-start`. This can happen on late-attaching\n      // subscriptions when the server has already trimmed the\n      // `message-start` from its replay buffer. Synthesize a minimal\n      // active message so the assembler can still fold subsequent\n      // events instead of hard-failing the caller.\n      const syntheticKey = runKey ?? `${namespaceNodeKey}::`;\n      this.activeByNamespaceNode.set(namespaceNodeKey, syntheticKey);\n      const synthetic: AssembledMessage = {\n        id: data.id,\n        namespace: [...event.params.namespace],\n        node: event.params.node,\n        runId,\n        blocks: [],\n      };\n      this.activeMessages.set(syntheticKey, synthetic);\n      return this.consume(event);\n    }\n\n    const message = this.activeMessages.get(activeKey);\n    if (!message) {\n      throw new Error(`No active message state found for key ${activeKey}`);\n    }\n\n    if ((data as { event?: string }).event === \"usage\") {\n      message.usage = (data as { usage?: UsageInfo }).usage;\n      return {\n        kind: \"usage\",\n        key: activeKey,\n        message,\n        event,\n      };\n    }\n\n    switch (data.event) {\n      case \"content-block-start\": {\n        message.blocks[data.index] = cloneBlock(data.content);\n        this.blockIndexByProtocolIndexAndType.set(\n          blockIndexKey(activeKey, data.index, data.content.type),\n          data.index\n        );\n        return {\n          kind: \"content-block-start\",\n          key: activeKey,\n          message,\n          index: data.index,\n          block: data.content,\n          event,\n        };\n      }\n      case \"content-block-delta\": {\n        const deltaEvent = data as typeof data & {\n          content?: ContentBlock;\n          delta?: ContentBlockDelta;\n        };\n        if (deltaEvent.content == null && deltaEvent.delta == null) {\n          throw new Error(\"Received content-block-delta without content\");\n        }\n        const deltaBlock =\n          deltaEvent.content ??\n          blockFromDelta(deltaEvent.delta!, message.blocks[data.index]);\n        if (deltaBlock == null) return undefined;\n        const targetIndex = this.resolveBlockIndex(\n          activeKey,\n          message.blocks,\n          data.index,\n          deltaBlock.type\n        );\n        const current = message.blocks[targetIndex];\n        message.blocks[targetIndex] =\n          deltaEvent.content != null\n            ? current == null\n              ? cloneBlock(deltaEvent.content)\n              : applyContentDelta(current, deltaEvent.content)\n            : (applyCoreEventDelta(\n                current as CoreContentBlock | undefined,\n                data as unknown as ContentBlockDeltaEvent\n              ) as unknown as ContentBlock);\n        return {\n          kind: \"content-block-delta\",\n          key: activeKey,\n          message,\n          index: targetIndex,\n          block: deltaBlock,\n          event,\n        };\n      }\n      case \"content-block-finish\": {\n        const targetIndex = this.resolveFinishBlockIndex(\n          activeKey,\n          data.index,\n          data.content.type\n        );\n        message.blocks[targetIndex] = cloneBlock(data.content);\n        return {\n          kind: \"content-block-finish\",\n          key: activeKey,\n          message,\n          index: targetIndex,\n          block: data.content,\n          event,\n        };\n      }\n      case \"message-finish\": {\n        message.usage = readUsage(data) ?? message.usage;\n        message.finishMetadata = readFinishMetadata(data);\n        message.finishReason = data.reason;\n        this.clearActiveMessage(activeKey, namespaceNodeKey);\n        this.clearBlockIndexAliases(activeKey);\n        return {\n          kind: \"message-finish\",\n          key: activeKey,\n          message: structuredClone(message),\n          event,\n        };\n      }\n      case \"error\": {\n        message.error = { message: data.message, code: data.code };\n        this.clearActiveMessage(activeKey, namespaceNodeKey);\n        this.clearBlockIndexAliases(activeKey);\n        return {\n          kind: \"message-error\",\n          key: activeKey,\n          message: structuredClone(message),\n          event,\n        };\n      }\n    }\n  }\n\n  /**\n   * Drop every message that started but never got `message-finish` or\n   * `error`, e.g. because the run was cancelled mid-stream.\n   *\n   * @param namespace - Only abandon messages at or below this namespace.\n   * @returns The abandoned messages.\n   */\n  abandonActive(namespace?: readonly string[]): AssembledMessage[] {\n    const abandoned: AssembledMessage[] = [];\n    for (const [key, message] of this.activeMessages) {\n      if (\n        namespace != null &&\n        !hasNamespacePrefix(message.namespace, namespace)\n      )\n        continue;\n      abandoned.push(message);\n      this.activeMessages.delete(key);\n      this.clearBlockIndexAliases(key);\n      for (const [nsNode, activeKey] of this.activeByNamespaceNode) {\n        if (activeKey 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readonly string[]\n): boolean {\n  return prefix.every((segment, i) => namespace[i] === segment);\n}\n\nfunction blockIndexKey(\n  activeKey: string,\n  protocolIndex: number,\n  blockType: string\n): string {\n  return `${activeKey}::${protocolIndex}::${blockType}`;\n}\n\nfunction areCompatibleBlockTypes(\n  currentType: string,\n  nextType: string\n): boolean {\n  const toolCallTypes = new Set([\n    \"tool_call\",\n    \"tool_call_chunk\",\n    \"tool_use\",\n    \"input_json_delta\",\n  ]);\n  const serverToolCallTypes = new Set([\n    \"server_tool_call\",\n    \"server_tool_call_chunk\",\n  ]);\n\n  return (\n    (toolCallTypes.has(currentType) && toolCallTypes.has(nextType)) ||\n    (serverToolCallTypes.has(currentType) && serverToolCallTypes.has(nextType))\n  );\n}\n\n/**\n * Assembles `messages` events into {@link StreamingMessage} instances\n * with live text/reasoning delta streams, matching the in-process\n * `ChatModelStream` dual-interface pattern.\n */\nexport class StreamingMessageAssembler {\n  readonly #assembler = new MessageAssembler();\n  readonly #activeStreaming = new Map<string, StreamingMessage>();\n\n  /**\n   * Folds a single event and returns a new {@link StreamingMessage}\n   * when a `message-start` is seen, or `undefined` for continuation\n   * events (deltas, finish, error).\n   */\n  consume(event: MessagesEvent): StreamingMessage | undefined {\n    const update = this.#assembler.consume(event);\n    if (update == null) return undefined;\n\n    switch (update.kind) {\n      case \"message-start\": {\n        const streaming = new StreamingMessage(update.message);\n        streaming[UPDATE_CONTEXT](update.event);\n        streaming[PUSH_EVENT](toChatModelStreamEvent(update.event));\n        this.#activeStreaming.set(update.key, streaming);\n        return streaming;\n      }\n      case \"content-block-start\": {\n        const streaming = this.#activeStreaming.get(update.key);\n        if (streaming) {\n          streaming[UPDATE_CONTEXT](update.event);\n          streaming[PUSH_EVENT](toChatModelStreamEvent(update.event));\n        }\n        if (\n          streaming &&\n          update.block.type === \"text\" &&\n          \"text\" in update.block &&\n          update.block.text\n        ) {\n          streaming[PUSH_TEXT](update.block.text);\n        }\n        if (\n          streaming &&\n          update.block.type === \"reasoning\" &&\n          \"reasoning\" in update.block &&\n          update.block.reasoning\n        ) {\n          streaming[PUSH_REASONING](update.block.reasoning);\n        }\n        return undefined;\n      }\n      case \"content-block-delta\": {\n        const streaming = this.#activeStreaming.get(update.key);\n        if (!streaming) return undefined;\n        streaming[UPDATE_CONTEXT](update.event);\n        streaming[PUSH_EVENT](toChatModelStreamEvent(update.event));\n        if (update.block.type === \"text\" && \"text\" in update.block) {\n          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streaming[UPDATE_CONTEXT](update.event);\n          streaming[PUSH_EVENT](toChatModelStreamEvent(update.event));\n          streaming[FINISH]();\n          this.#activeStreaming.delete(update.key);\n        }\n        return undefined;\n      }\n      case \"message-error\": {\n        const streaming = this.#activeStreaming.get(update.key);\n        if (streaming) {\n          streaming[UPDATE_CONTEXT](update.event);\n          streaming[PUSH_EVENT](toChatModelStreamEvent(update.event));\n          streaming[ERROR]();\n          this.#activeStreaming.delete(update.key);\n        }\n        return undefined;\n      }\n    }\n  }\n\n  /**\n   * Settle every message that never finished, marking it with an\n   * `aborted` error so awaiting consumers don't hang.\n   *\n   * @param namespace - Only abandon messages at or below this namespace.\n   * @returns The abandoned messages.\n   */\n  abandonActive(namespace?: readonly string[]): StreamingMessage[] {\n    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