@langchain/langgraph-sdk/dist/client/stream/media.cjs.map

Client library for interacting with the LangGraph API

{"version":3,"file":"media.cjs","names":["#parts","#blobPromise","#transcriptPromise","#fetchImpl","#blobResolve","#blobReject","#transcriptResolve","#transcriptReject","#lastIndex","#urlSourced","#absorbAudio","#absorbImage","#absorbVideo","#absorbFile","#finished","#settled","#totalBytes","#partialSnapshot","#streamController","#transcriptParts","#fetchUrlSourced","#cachedObjectURL","#stream","#buildUrlStream","#buildInlineStream","#startUrlFetch","#urlFetchPromise","#callbacks","#fetch","#active","#activeByNamespaceNode","#flushSlot","#syntheticCounter","#consumeMediaBlock","#emit"],"sources":["../../../src/client/stream/media.ts"],"sourcesContent":["import type {\n  AudioContentBlock,\n  ContentBlock,\n  FileContentBlock,\n  ImageContentBlock,\n  MessagesEvent,\n  VideoContentBlock,\n} from \"@langchain/protocol\";\n\n/**\n * Block types this assembler knows how to reassemble into media handles.\n */\nexport type MediaBlockType = \"audio\" | \"image\" | \"video\" | \"file\";\n\nconst MEDIA_BLOCK_TYPES: ReadonlySet<string> = new Set<MediaBlockType>([\n  \"audio\",\n  \"image\",\n  \"video\",\n  \"file\",\n]);\n\n/**\n * Kinds of failure that can terminate a media handle prematurely.\n *\n * - `\"message-error\"` — the upstream message emitted an `error` event\n *   before completion.\n * - `\"stream-closed\"` — the transport stream closed before\n *   `message-finish` arrived (thread closed, transport dropped, etc.).\n * - `\"fetch-failed\"` — the block was `url`-sourced and the lazy\n *   `fetch()` rejected (CORS, 404, 5xx, network).\n */\nexport type MediaAssemblyErrorKind =\n  | \"message-error\"\n  | \"stream-closed\"\n  | \"fetch-failed\";\n\n/**\n * Typed error thrown through `media.stream` / rejected from\n * `media.blob` / `media.objectURL` when a handle fails before its\n * message completes. Carries the bytes accumulated up to the failure\n * point on `partialBytes` for callers that want to salvage or diagnose.\n */\nexport class MediaAssemblyError extends Error {\n  readonly kind: MediaAssemblyErrorKind;\n  readonly messageId: string;\n  readonly partialBytes: Uint8Array;\n  // oxlint-disable-next-line typescript/no-explicit-any\n  readonly cause?: unknown;\n\n  constructor(\n    kind: MediaAssemblyErrorKind,\n    messageId: string,\n    partialBytes: Uint8Array,\n    message?: string,\n    options?: { cause?: unknown }\n  ) {\n    super(message ?? `media ${kind} for message ${messageId}`);\n    this.name = \"MediaAssemblyError\";\n    this.kind = kind;\n    this.messageId = messageId;\n    this.partialBytes = partialBytes;\n    this.cause = options?.cause;\n  }\n}\n\n/**\n * Shared surface across every media handle returned by\n * {@link MediaAssembler}.\n *\n * The handle is live while its parent message is active:\n *  - `partialBytes` is a snapshot of all bytes received so far.\n *  - `stream` is a lazy, single-consumer byte stream (see\n *    accessor docstring).\n *  - `blob` / `objectURL` settle on `message-finish`.\n *  - `error` becomes set if the handle terminates in any of the\n *    {@link MediaAssemblyErrorKind} failure modes.\n */\nexport interface MediaBase {\n  readonly messageId: string;\n  readonly namespace: string[];\n  readonly node?: string;\n  /** `id` from the originating content block, if the provider sent one. */\n  readonly id?: string;\n  readonly mimeType?: string;\n  /**\n   * Present iff the originating block carried `url` (not `data`).\n   * When set, `blob` / `stream` / `objectURL` lazily fetch from here\n   * on first access.\n   */\n  readonly url?: string;\n\n  /**\n   * Live byte stream.\n   *\n   * Lazy: not materialised unless accessed. On first access the\n   * stream is seeded with every byte already accumulated\n   * (`partialBytes`) and then wired to future chunks. For URL-sourced\n   * blocks, first access triggers `fetch()` and pipes the response\n   * body through.\n   *\n   * Repeated access returns the same {@link ReadableStream} reference\n   * — you can safely read it once, release the lock, and re-acquire a\n   * reader later (e.g. React StrictMode effect re-invokes). The\n   * standard `ReadableStream.locked` semantics prevent concurrent\n   * readers; use `stream.tee()` when you truly need multiple live\n   * consumers.\n   */\n  readonly stream: ReadableStream<Uint8Array>;\n\n  /** Resolves on `message-finish` with the concatenated {@link Blob}. */\n  readonly blob: Promise<Blob>;\n\n  /**\n   * Lazy {@link URL.createObjectURL} over {@link blob}. Cached: first\n   * access creates the URL, subsequent accesses return the same one.\n   * Call {@link revoke} to free the URL slot; the next access creates\n   * a fresh URL. `ThreadStream.close()` auto-revokes as a safety net.\n   */\n  readonly objectURL: Promise<string>;\n\n  /** Live view of accumulated bytes. Settles with final bytes on finish. */\n  readonly partialBytes: Uint8Array;\n\n  /** Set iff the handle settled in an error state. */\n  readonly error?: MediaAssemblyError;\n\n  /** Diagnostic: `false` if block indices arrived out of order. */\n  readonly monotonic: boolean;\n\n  /**\n   * Revoke the currently-cached object URL (if any). Subsequent\n   * accesses to {@link objectURL} create a fresh URL from the Blob.\n   * Idempotent.\n   */\n  revoke(): void;\n}\n\nexport interface AudioMedia extends MediaBase {\n  readonly type: \"audio\";\n  /**\n   * Concatenated transcript across every audio block in this message.\n   * Resolves on `message-finish` with the joined string, or `undefined`\n   * when no block carried a transcript.\n   */\n  readonly transcript: Promise<string | undefined>;\n}\n\nexport interface ImageMedia extends MediaBase {\n  readonly type: \"image\";\n  /** Pixel width, if the provider sent it on the originating block. */\n  readonly width?: number;\n  /** Pixel height, if the provider sent it on the originating block. */\n  readonly height?: number;\n}\n\nexport interface VideoMedia extends MediaBase {\n  readonly type: \"video\";\n}\n\nexport interface FileMedia extends MediaBase {\n  readonly type: \"file\";\n  /** File name hint, if the provider sent it on the originating block. */\n  readonly filename?: string;\n}\n\nexport type AnyMediaHandle = AudioMedia | ImageMedia | VideoMedia | FileMedia;\n\nfunction base64ToBytes(b64: string): Uint8Array {\n  // atob is standard in all modern browsers and Node >= 16. Works on\n  // standard base64 only (no `-`/`_` URL-safe variants; the protocol\n  // uses standard base64).\n  const binary = atob(b64);\n  const bytes = new Uint8Array(binary.length);\n  for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i);\n  return bytes;\n}\n\nfunction concatBytes(parts: Uint8Array[], totalLength: number): Uint8Array {\n  const out = new Uint8Array(totalLength);\n  let offset = 0;\n  for (const part of parts) {\n    out.set(part, offset);\n    offset += part.byteLength;\n  }\n  return out;\n}\n\n/**\n * Concrete handle implementation shared by all four media types.\n *\n * One instance per `(messageId, blockType)` pair created by the\n * assembler on first matching `content-block-start`.\n */\nclass MediaHandleImpl {\n  readonly type: MediaBlockType;\n  readonly messageId: string;\n  readonly namespace: string[];\n  readonly node: string | undefined;\n  readonly id: string | undefined;\n\n  mimeType: string | undefined;\n  url: string | undefined;\n  width?: number;\n  height?: number;\n  filename?: string;\n\n  monotonic = true;\n  error: MediaAssemblyError | undefined;\n\n  // Byte accumulation --------------------------------------------------\n\n  readonly #parts: Uint8Array[] = [];\n  #totalBytes = 0;\n  #partialSnapshot: Uint8Array = new Uint8Array(0);\n\n  // Stream (lazy, idempotent getter) ----------------------------------\n  //\n  // First access creates the `ReadableStream` and wires it to future\n  // chunks; subsequent accesses return the SAME reference. Consumers\n  // that want to fan-out must call `.tee()` explicitly — the native\n  // `ReadableStream.locked` flag prevents two concurrent readers.\n\n  #stream: ReadableStream<Uint8Array> | undefined;\n  #streamController: ReadableStreamDefaultController<Uint8Array> | undefined;\n\n  // Blob / URL settlement ---------------------------------------------\n\n  #blobResolve!: (value: Blob) => void;\n  #blobReject!: (reason: unknown) => void;\n  readonly #blobPromise: Promise<Blob>;\n\n  #transcriptParts: string[] = [];\n  #transcriptResolve!: (value: string | undefined) => void;\n  #transcriptReject!: (reason: unknown) => void;\n  readonly #transcriptPromise: Promise<string | undefined>;\n\n  #cachedObjectURL: string | undefined;\n\n  // URL-sourced mode ---------------------------------------------------\n\n  #urlSourced = false;\n  #urlFetchPromise: Promise<Uint8Array> | undefined;\n\n  // Index tracking -----------------------------------------------------\n\n  #lastIndex = -1;\n\n  // Lifecycle flags ----------------------------------------------------\n\n  #finished = false;\n  #settled = false;\n\n  // Injected dependencies ---------------------------------------------\n\n  readonly #fetchImpl: typeof fetch;\n\n  constructor(options: {\n    type: MediaBlockType;\n    messageId: string;\n    namespace: string[];\n    node: string | undefined;\n    id: string | undefined;\n    mimeType: string | undefined;\n    url: string | undefined;\n    fetch: typeof fetch;\n  }) {\n    this.type = options.type;\n    this.messageId = options.messageId;\n    this.namespace = options.namespace;\n    this.node = options.node;\n    this.id = options.id;\n    this.mimeType = options.mimeType;\n    this.url = options.url;\n    this.#fetchImpl = options.fetch;\n\n    this.#blobPromise = new Promise<Blob>((resolve, reject) => {\n      this.#blobResolve = resolve;\n      this.#blobReject = reject;\n    });\n    // Swallow rejections here so the async promise doesn't surface as\n    // an unhandled rejection when callers never touch `.blob`. Any\n    // consumer that does await it still observes the original reason.\n    this.#blobPromise.catch(() => undefined);\n\n    this.#transcriptPromise = new Promise<string | undefined>(\n      (resolve, reject) => {\n        this.#transcriptResolve = resolve;\n        this.#transcriptReject = reject;\n      }\n    );\n    this.#transcriptPromise.catch(() => undefined);\n  }\n\n  // ---------- Input side (driven by the assembler) ----------\n\n  /** Track a block index for the monotonic-ordering diagnostic. */\n  observeIndex(index: number): void {\n    if (index !== this.#lastIndex + 1 && index !== this.#lastIndex) {\n      this.monotonic = false;\n    }\n    if (index > this.#lastIndex) this.#lastIndex = index;\n  }\n\n  /** Absorb `mime_type` / per-type extras carried on an incoming block. */\n  absorbBlock(block: ContentBlock): void {\n    if (this.#urlSourced) return;\n    // `Extensible` widens `block.type` from a literal to `string` in\n    // the union, defeating TS's discriminated-union narrowing. Cast\n    // after the runtime tag check.\n    if (block.type === \"audio\") this.#absorbAudio(block as AudioContentBlock);\n    else if (block.type === \"image\")\n      this.#absorbImage(block as ImageContentBlock);\n    else if (block.type === \"video\")\n      this.#absorbVideo(block as VideoContentBlock);\n    else if (block.type === \"file\") this.#absorbFile(block as FileContentBlock);\n  }\n\n  /** Record that the originating block arrived with `url` not `data`. */\n  enterUrlMode(url: string): void {\n    this.#urlSourced = true;\n    this.url = url;\n  }\n\n  /** Push a fresh chunk of bytes into the handle. */\n  pushBytes(bytes: Uint8Array): void {\n    if (this.#finished || this.#settled) return;\n    if (bytes.byteLength === 0) return;\n    this.#parts.push(bytes);\n    this.#totalBytes += bytes.byteLength;\n    this.#partialSnapshot = concatBytes(this.#parts, this.#totalBytes);\n    if (this.#streamController != null) {\n      try {\n        this.#streamController.enqueue(bytes);\n      } catch {\n        // Reader detached; ignore — `partialBytes`/`blob` still work.\n      }\n    }\n  }\n\n  /** Append a transcript fragment from an audio block. */\n  pushTranscript(fragment: string): void {\n    if (this.type !== \"audio\") return;\n    if (this.#finished || this.#settled) return;\n    if (fragment.length === 0) return;\n    this.#transcriptParts.push(fragment);\n  }\n\n  /** Called on `message-finish`. Settles blob/transcript/stream. */\n  finish(): void {\n    if (this.#finished || this.#settled) return;\n    this.#finished = true;\n    this.#settled = true;\n    // Cast: the lib types reject `Uint8Array<ArrayBufferLike>` because\n    // `BlobPart` requires `Uint8Array<ArrayBuffer>` specifically. Our\n    // accumulator is allocated with `new Uint8Array(len)`, so it is\n    // backed by an `ArrayBuffer` (not `SharedArrayBuffer`).\n    const blob = new Blob([this.#partialSnapshot as unknown as BlobPart], {\n      type: this.mimeType ?? \"\",\n    });\n    this.#blobResolve(blob);\n    this.#transcriptResolve(\n      this.#transcriptParts.length === 0\n        ? undefined\n        : this.#transcriptParts.join(\"\")\n    );\n    try {\n      this.#streamController?.close();\n    } catch {\n      // Reader may have detached already.\n    }\n  }\n\n  /** Propagate an error through blob/transcript/stream. */\n  fail(\n    kind: MediaAssemblyErrorKind,\n    reason?: string,\n    cause?: unknown\n  ): MediaAssemblyError {\n    if (this.#settled) {\n      return (\n        this.error ??\n        new MediaAssemblyError(\n          kind,\n          this.messageId,\n          this.#partialSnapshot,\n          reason,\n          { cause }\n        )\n      );\n    }\n    this.#settled = true;\n    const err = new MediaAssemblyError(\n      kind,\n      this.messageId,\n      this.#partialSnapshot,\n      reason,\n      { cause }\n    );\n    this.error = err;\n    this.#blobReject(err);\n    this.#transcriptReject(err);\n    try {\n      this.#streamController?.error(err);\n    } catch {\n      // Reader may have detached already.\n    }\n    return err;\n  }\n\n  // ---------- Public surface read by consumers ----------\n\n  get partialBytes(): Uint8Array {\n    return this.#partialSnapshot;\n  }\n\n  get blob(): Promise<Blob> {\n    if (this.#urlSourced)\n      return this.#fetchUrlSourced().then(\n        (bytes) =>\n          new Blob([bytes as unknown as BlobPart], {\n            type: this.mimeType ?? \"\",\n          })\n      );\n    return this.#blobPromise;\n  }\n\n  get transcript(): Promise<string | undefined> {\n    return this.#transcriptPromise;\n  }\n\n  get objectURL(): Promise<string> {\n    if (this.#cachedObjectURL != null) {\n      const cached = this.#cachedObjectURL;\n      return Promise.resolve(cached);\n    }\n    return this.blob.then((blob) => {\n      // Race-safe: if revoke() fired before we got here, we cache the\n      // freshly-created URL for the next reader.\n      if (this.#cachedObjectURL != null) return this.#cachedObjectURL;\n      const url = URL.createObjectURL(blob);\n      this.#cachedObjectURL = url;\n      return url;\n    });\n  }\n\n  revoke(): void {\n    const url = this.#cachedObjectURL;\n    if (url == null) return;\n    this.#cachedObjectURL = undefined;\n    try {\n      URL.revokeObjectURL(url);\n    } catch {\n      // URL.revokeObjectURL is side-effect-only; very unlikely to throw\n      // but keep the handle usable if a polyfill misbehaves.\n    }\n  }\n\n  get stream(): ReadableStream<Uint8Array> {\n    if (this.#stream != null) return this.#stream;\n    if (this.#urlSourced) return this.#buildUrlStream();\n    return this.#buildInlineStream();\n  }\n\n  // ---------- Internals ----------\n\n  #absorbAudio(block: AudioContentBlock): void {\n    const mimeType =\n      block.mime_type ?? (block as { mimeType?: string }).mimeType;\n    if (this.mimeType == null && mimeType != null) this.mimeType = mimeType;\n    if (block.transcript != null && block.transcript.length > 0) {\n      this.pushTranscript(block.transcript);\n    }\n  }\n\n  #absorbImage(block: ImageContentBlock): void {\n    const mimeType =\n      block.mime_type ?? (block as { mimeType?: string }).mimeType;\n    if (this.mimeType == null && mimeType != null) this.mimeType = mimeType;\n    if (this.width == null && block.width != null) this.width = block.width;\n    if (this.height == null && block.height != null) this.height = block.height;\n  }\n\n  #absorbVideo(block: VideoContentBlock): void {\n    const mimeType =\n      block.mime_type ?? (block as { mimeType?: string }).mimeType;\n    if (this.mimeType == null && mimeType != null) this.mimeType = mimeType;\n  }\n\n  #absorbFile(block: FileContentBlock): void {\n    const mimeType =\n      block.mime_type ?? (block as { mimeType?: string }).mimeType;\n    if (this.mimeType == null && mimeType != null) this.mimeType = mimeType;\n    if (this.filename == null && block.filename != null)\n      this.filename = block.filename;\n  }\n\n  #buildInlineStream(): ReadableStream<Uint8Array> {\n    const seed = this.#partialSnapshot;\n    const alreadyFinished = this.#finished;\n    const alreadyErrored = this.error;\n\n    this.#stream = new ReadableStream<Uint8Array>({\n      start: (controller) => {\n        this.#streamController = controller;\n        if (seed.byteLength > 0) controller.enqueue(seed);\n        if (alreadyErrored != null) {\n          controller.error(alreadyErrored);\n          return;\n        }\n        if (alreadyFinished) {\n          controller.close();\n        }\n      },\n      cancel: () => {\n        this.#streamController = undefined;\n      },\n    });\n    return this.#stream;\n  }\n\n  #buildUrlStream(): ReadableStream<Uint8Array> {\n    // For URL-sourced blocks, we pipe the fetch response body directly\n    // through. `partialBytes` / `blob` share the same buffered bytes via\n    // #fetchUrlSourced().\n    const urlSourceFetch = this.#startUrlFetch();\n    this.#stream = new ReadableStream<Uint8Array>({\n      start: async (controller) => {\n        try {\n          const response = await urlSourceFetch;\n          if (response.body == null) {\n            const bytes = new Uint8Array(await response.arrayBuffer());\n            if (bytes.byteLength > 0) controller.enqueue(bytes);\n            controller.close();\n            return;\n          }\n          const reader = response.body.getReader();\n          // oxlint-disable-next-line no-constant-condition\n          while (true) {\n            const { done, value } = await reader.read();\n            if (done) break;\n            if (value != null) controller.enqueue(value);\n          }\n          controller.close();\n        } catch (err) {\n          controller.error(\n            this.fail(\"fetch-failed\", (err as Error)?.message, err)\n          );\n        }\n      },\n      cancel: () => {\n        this.#streamController = undefined;\n      },\n    });\n    return this.#stream;\n  }\n\n  /** Memoised fetch for URL-sourced blocks — returns one `Response`. */\n  #startUrlFetch(): Promise<Response> {\n    const url = this.url!;\n    return this.#fetchImpl(url).then((response) => {\n      if (!response.ok) {\n        throw new Error(\n          `fetch(${url}) failed: ${response.status} ${response.statusText}`\n        );\n      }\n      return response;\n    });\n  }\n\n  /** Fetch + buffer for URL-sourced `blob` access. Memoised. */\n  #fetchUrlSourced(): Promise<Uint8Array> {\n    if (this.#urlFetchPromise != null) return this.#urlFetchPromise;\n    this.#urlFetchPromise = (async () => {\n      try {\n        const response = await this.#startUrlFetch();\n        const bytes = new Uint8Array(await response.arrayBuffer());\n        this.#parts.length = 0;\n        this.#parts.push(bytes);\n        this.#totalBytes = bytes.byteLength;\n        this.#partialSnapshot = bytes;\n        this.#finished = true;\n        this.#settled = true;\n        return bytes;\n      } catch (err) {\n        throw this.fail(\"fetch-failed\", (err as Error)?.message, err);\n      }\n    })();\n    return this.#urlFetchPromise;\n  }\n}\n\n/**\n * Dispatch callbacks receive a freshly-started handle on its first\n * matching `content-block-start`. Exactly one callback fires per\n * `(messageId, blockType)` pair.\n */\nexport interface MediaAssemblerCallbacks {\n  onAudio?: (media: AudioMedia) => void;\n  onImage?: (media: ImageMedia) => void;\n  onVideo?: (media: VideoMedia) => void;\n  onFile?: (media: FileMedia) => void;\n  /**\n   * Invoked for every type; receives the same handle as the typed\n   * callback. Useful for writing one \"all media\" consumer without\n   * registering four type-specific callbacks.\n   */\n  onMedia?: (media: AnyMediaHandle) => void;\n}\n\nexport interface MediaAssemblerOptions extends MediaAssemblerCallbacks {\n  /**\n   * Injected `fetch` used for URL-sourced blocks. Defaults to the\n   * global `fetch`. Throws on first URL access if neither is present.\n   */\n  fetch?: typeof fetch;\n}\n\n/**\n * Incrementally folds `messages` events into typed media handles\n * (audio / image / video / file) that buffer bytes, expose a\n * {@link Blob}, and lazily mint an object URL for direct use in\n * `<audio>` / `<img>` / `<video>` tags.\n *\n * Semantics pinned during design:\n *  - One handle per `(messageId, blockType)` pair. Mixed-type messages\n *    surface on multiple iterables with the same `messageId`.\n *  - Handle yielded on the **first matching `content-block-start`** —\n *    messages with no matching blocks never yield an item (filters\n *    `lc_run--` LangChain terminator noise automatically).\n *  - Byte extraction: every `content-block-start` /\n *    `content-block-delta` with a `data` field decodes base64 and\n *    pushes into the accumulator. `content-block-finish` is a sync\n *    point.\n *  - URL-sourced blocks: if the initial block carries `url`, the\n *    handle enters URL mode — `blob`/`stream`/`objectURL` lazy-fetch\n *    on first access, subsequent data/url deltas are ignored.\n *  - Fail loud: `message-error`, stream closure before finish, and\n *    fetch failures all populate `handle.error`, reject `blob` /\n *    `transcript` / `objectURL`, and error the stream.\n *  - Diagnostic only: `handle.monotonic` flips false if block indices\n *    arrive out of order (protocol guarantees in-order within a\n *    subscription, so `false` indicates an upstream bug).\n */\n/**\n * Per-`(namespace, node)` bookkeeping for the active message the\n * assembler is currently folding.\n *\n * Protocol v2 only carries `id` on `message-start`; all\n * subsequent `content-block-*` / `message-finish` / `error` events\n * address the active message by position (same namespace + node). The\n * assembler therefore pins a message entry when `message-start`\n * arrives and resolves follow-ups by looking up `(namespace, node)`.\n */\ninterface ActiveMessage {\n  /** `id` from `message-start`, or empty string when synthesized. */\n  messageId: string;\n  /** `${messageId}::${mediaType}::${index}` keys currently active under this message. */\n  keys: Set<string>;\n  /** Content-block index → active media key. */\n  indexKeys: Map<number, string>;\n}\n\nexport class MediaAssembler {\n  readonly #callbacks: MediaAssemblerCallbacks;\n  readonly #fetch: typeof fetch;\n  // Keyed by `${messageId}::${type}::${blockIndex}`.\n  readonly #active = new Map<string, MediaHandleImpl>();\n  // Maps `${namespace.join(\"/\")}::${node ?? \"\"}` → active message. One\n  // entry per in-flight logical message; replaced on each\n  // `message-start`, removed on `message-finish` / `error`.\n  readonly #activeByNamespaceNode = new Map<string, ActiveMessage>();\n  // Monotonically increasing counter used to mint stable synthetic\n  // ids when a `content-block-*` arrives before any `message-start`\n  // (e.g. late-attaching subscribers that missed the message-start).\n  #syntheticCounter = 0;\n\n  constructor(options: MediaAssemblerOptions = {}) {\n    this.#callbacks = options;\n    if (options.fetch != null) {\n      this.#fetch = options.fetch;\n    } else if (typeof fetch === \"function\") {\n      this.#fetch = fetch;\n    } else {\n      // Throw lazily on URL access rather than construction, so\n      // inline-only flows in Node without a global fetch still work.\n      this.#fetch = () => {\n        throw new Error(\n          \"MediaAssembler: no fetch implementation available. Pass `fetch` in options.\"\n        );\n      };\n    }\n  }\n\n  /**\n   * Fold a single `messages` event. Non-media blocks and\n   * informational events (e.g. `content-block-finish`) are no-ops.\n   */\n  consume(event: MessagesEvent): void {\n    const data = event.params.data;\n    const namespace = event.params.namespace;\n    const node = event.params.node;\n    const nsNodeKey = `${namespace.join(\"/\")}::${node ?? \"\"}`;\n\n    if (data.event === \"message-start\") {\n      // A new `message-start` may arrive before a prior message on\n      // the same `(namespace, node)` emitted `message-finish` (the\n      // protocol permits trimmed replays on late subscribers). Flush\n      // any in-flight handles under that slot before rebinding.\n      this.#flushSlot(nsNodeKey, \"finish\");\n      this.#activeByNamespaceNode.set(nsNodeKey, {\n        messageId: data.id ?? \"\",\n        keys: new Set(),\n        indexKeys: new Map(),\n      });\n      return;\n    }\n\n    if (data.event === \"message-finish\") {\n      this.#flushSlot(nsNodeKey, \"finish\");\n      this.#activeByNamespaceNode.delete(nsNodeKey);\n      return;\n    }\n\n    if (data.event === \"error\") {\n      this.#flushSlot(\n        nsNodeKey,\n        \"error\",\n        (data as { message?: string }).message\n      );\n      this.#activeByNamespaceNode.delete(nsNodeKey);\n      return;\n    }\n\n    if (\n      data.event !== \"content-block-start\" &&\n      data.event !== \"content-block-delta\" &&\n      data.event !== \"content-block-finish\"\n    ) {\n      return;\n    }\n\n    const block = (data as { content?: ContentBlock; index?: number }).content;\n    const blockIndex = (data as { index?: number }).index ?? 0;\n\n    // Resolve the active message for this `(namespace, node)`. 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mediaBlock.url\n            : undefined,\n        fetch: this.#fetch,\n      });\n      if (mediaBlock.url != null && mediaBlock.data == null) {\n        handle.enterUrlMode(mediaBlock.url);\n      }\n      handle.observeIndex(blockIndex);\n      handle.absorbBlock(block);\n      if (mediaBlock.data != null) {\n        try {\n          handle.pushBytes(base64ToBytes(mediaBlock.data));\n        } catch (err) {\n          handle.fail(\"message-error\", \"invalid base64 on initial block\", err);\n        }\n      }\n      this.#active.set(key, handle);\n      active.keys.add(key);\n      active.indexKeys.set(blockIndex, key);\n      this.#emit(handle);\n      if (isTerminalBlock) {\n        handle.finish();\n        this.#active.delete(key);\n        active.keys.delete(key);\n        active.indexKeys.delete(blockIndex);\n      }\n      return;\n    }\n\n    // Subsequent event on an existing handle.\n    // - `content-block-finish` is a sync point: skip to avoid\n    //   double-counting bytes when the server echoes the full block\n    //   on both start and finish (typical for atomic, non-delta\n    //   blocks such as whole audio frames or single-shot images).\n    // A late subscriber may miss `content-block-start`; in that case a\n    // terminal block with full content is handled above by creating and\n    // immediately settling a one-block handle.\n    if (terminal) return;\n\n    const mediaBlock = block as\n      | AudioContentBlock\n      | ImageContentBlock\n      | VideoContentBlock\n      | FileContentBlock;\n    handle.observeIndex(blockIndex);\n    handle.absorbBlock(block);\n    if (!handle.error && mediaBlock.data != null) {\n      try {\n        handle.pushBytes(base64ToBytes(mediaBlock.data));\n      } catch (err) {\n        handle.fail(\"message-error\", \"invalid base64 on delta\", err);\n      }\n    }\n  }\n\n  /**\n   * Finish or fail every media handle currently active under the\n   * given `(namespace, node)` slot and clear its bookkeeping. 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