@tanstack/router-core/dist/cjs/ssr/transformStreamWithRouter.cjs.map

Modern and scalable routing for React applications

{"version":3,"file":"transformStreamWithRouter.cjs","names":[],"sources":["../../../src/ssr/transformStreamWithRouter.ts"],"sourcesContent":["import { ReadableStream } from 'node:stream/web'\nimport { Readable } from 'node:stream'\nimport { TSR_SCRIPT_BARRIER_ID } from './constants'\nimport type { AnyRouter } from '../router'\n\nexport type TransformStreamWithRouterOptions = {\n  /** Timeout for serialization to complete after app render finishes (default: 60000ms) */\n  timeoutMs?: number\n  /** Maximum lifetime of the stream transform (default: 120000ms). Safety net for cleanup. */\n  lifetimeMs?: number\n  /**\n   * Called exactly once when the stream is torn down due to abort/error/\n   * cancel/timeout — NOT on natural successful completion. Use this to\n   * abort a hidden producer upstream of any PassThrough you passed in\n   * (e.g. React `renderToPipeableStream`'s `abort()`).\n   * Errors thrown from this callback are swallowed.\n   */\n  onAbort?: (reason?: unknown) => void\n}\n\nexport function transformReadableStreamWithRouter(\n  router: AnyRouter,\n  routerStream: ReadableStream,\n  opts?: TransformStreamWithRouterOptions,\n) {\n  return transformStreamWithRouter(router, routerStream, opts)\n}\n\nexport function transformPipeableStreamWithRouter(\n  router: AnyRouter,\n  routerStream: Readable,\n  opts?: TransformStreamWithRouterOptions,\n) {\n  return Readable.fromWeb(\n    transformStreamWithRouter(router, Readable.toWeb(routerStream), opts),\n  )\n}\n\n// Minimum length of a valid closing tag: </a> = 4 characters\nconst MIN_CLOSING_TAG_LENGTH = 4\n\n// Default timeout values (in milliseconds)\nconst DEFAULT_SERIALIZATION_TIMEOUT_MS = 60000\nconst DEFAULT_LIFETIME_TIMEOUT_MS = DEFAULT_SERIALIZATION_TIMEOUT_MS * 2\nconst MAX_LEFTOVER_CHARS = 2048\nconst MAX_TAIL_CHARS = 64 * 1024\nconst MAX_ROUTER_HTML_CHARS = 16 * 1024 * 1024\nconst MAX_PENDING_WRITE_CHARS = 16 * 1024 * 1024\n\n// Merge lifecycle: body bytes can stream, router HTML must precede tail,\n// terminal states own close/error/cleanup exactly once.\nconst MergeState = {\n  ReadingBody: 0,\n  HoldingTail: 1,\n  AppDone: 2,\n  Draining: 3,\n  Done: 4,\n} as const\n\ntype MergeState = (typeof MergeState)[keyof typeof MergeState]\n\n// Module-level encoder (stateless, safe to reuse)\nconst textEncoder = new TextEncoder()\n\nconst noop = () => {}\nconst resolvedPromise = Promise.resolve()\n\n// Returns -bodyEndIndex - 2 when </body> is found; otherwise returns\n// the position after the last valid closing tag, or -1 when none exists.\nfunction findHtmlBoundary(str: string): number {\n  let lastClosingTagEnd = -1\n  let searchFrom = str.length - MIN_CLOSING_TAG_LENGTH\n\n  while (searchFrom >= 0) {\n    const openSlash = str.lastIndexOf('</', searchFrom)\n    if (openSlash === -1) break\n\n    // Fast case-insensitive match for </body>. Negative return encodes the\n    // body start index without allocating a result object.\n    if (\n      (str.charCodeAt(openSlash + 2) | 32) === 98 &&\n      (str.charCodeAt(openSlash + 3) | 32) === 111 &&\n      (str.charCodeAt(openSlash + 4) | 32) === 100 &&\n      (str.charCodeAt(openSlash + 5) | 32) === 121 &&\n      str.charCodeAt(openSlash + 6) === 62\n    ) {\n      return -openSlash - 2\n    }\n\n    if (lastClosingTagEnd === -1) {\n      let i = openSlash + 2\n      const startCode = str.charCodeAt(i)\n      if (\n        (startCode >= 97 && startCode <= 122) ||\n        (startCode >= 65 && startCode <= 90)\n      ) {\n        i++\n        while (i < str.length) {\n          const code = str.charCodeAt(i)\n          if (\n            (code >= 97 && code <= 122) || // a-z\n            (code >= 65 && code <= 90) || // A-Z\n            (code >= 48 && code <= 57) || // 0-9\n            code === 95 || // _\n            code === 58 || // :\n            code === 46 || // .\n            code === 45 // -\n          ) {\n            i++\n          } else {\n            break\n          }\n        }\n\n        if (str.charCodeAt(i) === 62) {\n          lastClosingTagEnd = i + 1\n        }\n      }\n    }\n\n    searchFrom = openSlash - 1\n  }\n\n  return lastClosingTagEnd\n}\n\n/**\n * Releasing the lock can throw if a pending read is still settling or if the\n * lock was already released.\n */\ntype ReaderOps = {\n  cancel: (reason?: unknown) => Promise<unknown>\n  releaseLock: () => void\n}\n\nfunction safeReleaseReader(reader: ReaderOps) {\n  try {\n    reader.releaseLock()\n    return true\n  } catch {\n    return false\n  }\n}\n\n/**\n * Cancel a reader without producing an unhandled rejection. `reader.cancel()`\n * can reject (e.g. when the underlying source's cancel() throws), and\n * downstream cancel() should still wait for upstream teardown when possible.\n */\nfunction safeCancelReader(reader: ReaderOps, reason?: unknown): Promise<void> {\n  let cancelPromise: Promise<unknown> | undefined\n  try {\n    cancelPromise = reader.cancel(reason)\n  } catch {\n    // ignore\n  }\n\n  if (!safeReleaseReader(reader) && cancelPromise) {\n    return cancelPromise.then(noop, noop).then(() => {\n      safeReleaseReader(reader)\n    })\n  }\n\n  return cancelPromise ? cancelPromise.then(noop, noop) : resolvedPromise\n}\n\nfunction createReaderState<T>(appStream: ReadableStream<T>) {\n  const reader = appStream.getReader()\n  let released = false\n\n  return {\n    reader,\n    cancel: (reason?: unknown) => {\n      if (released) return resolvedPromise\n      released = true\n      return safeCancelReader(reader, reason)\n    },\n    release: () => {\n      if (released) return\n      released = true\n      safeReleaseReader(reader)\n    },\n  }\n}\n\nfunction createAbortNotifier(opts?: TransformStreamWithRouterOptions) {\n  let abortNotified = false\n  return (reason?: unknown) => {\n    if (abortNotified) return\n    abortNotified = true\n    try {\n      opts?.onAbort?.(reason)\n    } catch {\n      // swallow user errors\n    }\n  }\n}\n\nexport function transformStreamWithRouter(\n  router: AnyRouter,\n  appStream: ReadableStream,\n  opts?: TransformStreamWithRouterOptions,\n) {\n  const serverSsr = router.serverSsr\n  if (!serverSsr) {\n    throw new Error('Invariant failed: router.serverSsr is required')\n  }\n  if (serverSsr.reserveStreamFastPath()) {\n    return makeFastPathStream(appStream, opts, serverSsr)\n  }\n\n  return makeMainStream(serverSsr, appStream, opts)\n}\n\n// =====================================================================\n// Fast path: passthrough with cleanup + backpressure on app reads.\n// =====================================================================\nfunction makeFastPathStream(\n  appStream: ReadableStream<Uint8Array>,\n  opts?: TransformStreamWithRouterOptions,\n  serverSsr?: NonNullable<AnyRouter['serverSsr']>,\n) {\n  let cleanedUp = false\n  let controller: ReadableStreamDefaultController<Uint8Array> | undefined\n  let state: MergeState = MergeState.ReadingBody\n  let lifetimeTimeoutHandle: ReturnType<typeof setTimeout> | undefined\n  let stopListeningToInjectedHtml: (() => void) | undefined\n  const readerState = createReaderState(appStream)\n  const notifyAbort = createAbortNotifier(opts)\n  const isDone = () => state === MergeState.Done\n  let renderFinished = false\n\n  const finishSsrRendering = () => {\n    if (!serverSsr || renderFinished) return true\n    renderFinished = true\n    try {\n      serverSsr.setRenderFinished()\n      return true\n    } catch (error) {\n      safeError(error)\n      cleanup(error)\n      return false\n    }\n  }\n\n  const cleanup = (reason?: unknown, cancelReader = true) => {\n    if (cleanedUp) return resolvedPromise\n    cleanedUp = true\n\n    if (lifetimeTimeoutHandle !== undefined) {\n      clearTimeout(lifetimeTimeoutHandle)\n      lifetimeTimeoutHandle = undefined\n    }\n    try {\n      stopListeningToInjectedHtml?.()\n    } catch {\n      // ignore\n    }\n    stopListeningToInjectedHtml = undefined\n\n    if (cancelReader) {\n      // Notify the producer immediately. Reader cancellation may take time to\n      // settle, and upstream renderers must tolerate abort + cancel overlap.\n      notifyAbort(reason)\n    }\n    const readerDone = cancelReader\n      ? readerState.cancel(reason)\n      : (readerState.release(), resolvedPromise)\n    if (serverSsr) {\n      try {\n        serverSsr.cleanup()\n      } catch (error) {\n        console.error('Error in SSR cleanup:', error)\n      }\n    }\n    return readerDone\n  }\n\n  const safeClose = () => {\n    if (isDone()) return\n    state = MergeState.Done\n    try {\n      controller?.close()\n    } catch {\n      // ignore\n    }\n  }\n\n  const safeError = (error: unknown) => {\n    if (isDone()) return\n    state = MergeState.Done\n    try {\n      controller?.error(error)\n    } catch {\n      // ignore\n    }\n  }\n\n  if (serverSsr) {\n    stopListeningToInjectedHtml = serverSsr.onInjectedHtml(() => {\n      const err = new Error('SSR router HTML injected during fast path')\n      safeError(err)\n      cleanup(err)\n    })\n  }\n\n  const lifetimeMs = opts?.lifetimeMs ?? DEFAULT_LIFETIME_TIMEOUT_MS\n  lifetimeTimeoutHandle = setTimeout(() => {\n    if (!cleanedUp && !isDone()) {\n      const err = new Error('Stream lifetime exceeded')\n      console.warn(\n        `SSR stream transform exceeded maximum lifetime (${lifetimeMs}ms), forcing cleanup`,\n      )\n      safeError(err)\n      cleanup(err)\n    }\n  }, lifetimeMs)\n\n  const stream = new ReadableStream<Uint8Array>({\n    start(c) {\n      controller = c\n    },\n    async pull(c) {\n      if (cleanedUp || isDone()) return\n      try {\n        const { done, value } = await readerState.reader.read()\n        if (!done) {\n          if (!cleanedUp && !isDone()) {\n            c.enqueue(value)\n          }\n          return\n        }\n\n        if (cleanedUp || isDone()) return\n\n        if (!finishSsrRendering()) return\n        safeClose()\n        return cleanup(undefined, false)\n      } catch (error) {\n        if (cleanedUp) return\n        console.error('Error reading appStream:', error)\n        if (state < MergeState.AppDone) {\n          try {\n            serverSsr?.setRenderFinished()\n          } catch {\n            // ignore\n          }\n        }\n        safeError(error)\n        return cleanup(error)\n      } finally {\n        if (cleanedUp || isDone()) {\n          readerState.release()\n        }\n      }\n    },\n    cancel(reason) {\n      state = MergeState.Done\n      return cleanup(reason)\n    },\n  })\n\n  return stream\n}\n\n// =====================================================================\n// Main path: scan + inject router HTML/scripts with full backpressure.\n//\n// ALL output (app chunks AND router-injected HTML/scripts) flows through a\n// single pendingWrites queue and is only enqueued onto the downstream\n// controller when desiredSize > 0. This prevents native-memory growth of\n// queued Uint8Arrays under slow HTTP consumers.\n// =====================================================================\nfunction makeMainStream(\n  serverSsr: NonNullable<AnyRouter['serverSsr']>,\n  appStream: ReadableStream,\n  opts?: TransformStreamWithRouterOptions,\n) {\n  let stopListeningToInjectedHtml: (() => void) | undefined\n  let stopListeningToSerializationFinished: (() => void) | undefined\n  let serializationTimeoutHandle: ReturnType<typeof setTimeout> | undefined\n  let lifetimeTimeoutHandle: ReturnType<typeof setTimeout> | undefined\n  let cleanedUp = false\n\n  let controller: ReadableStreamDefaultController<Uint8Array> | undefined\n  let closeWhenDrained = false\n  let state: MergeState = MergeState.ReadingBody\n\n  const readerState = createReaderState(appStream)\n  const notifyAbort = createAbortNotifier(opts)\n\n  // Single output queue: app chunks + router-injected HTML/scripts.\n  // Stored as STRINGS to avoid holding native-backed Uint8Arrays in our queue\n  // while waiting for downstream capacity. Encoding happens at enqueue time\n  // (drainPending) so the bytes live only inside the controller's internal\n  // queue, not in two places.\n  //\n  // Uses an index pointer instead of Array.prototype.shift() (which is O(n))\n  // so many small router-injected script chunks stay O(1) per chunk.\n  const pendingWrites: Array<string> = []\n  let pendingWriteHead = 0\n  let pendingWriteChars = 0\n\n  function clearPending() {\n    pendingWrites.length = 0\n    pendingWriteHead = 0\n    pendingWriteChars = 0\n  }\n\n  // Backpressure: pull() resolves drainResolve to let the read loop advance.\n  let drainResolve: (() => void) | null = null\n  const waitForDrain = () =>\n    new Promise<void>((r) => {\n      drainResolve = r\n    })\n  const signalDrain = () => {\n    if (drainResolve) {\n      const r = drainResolve\n      drainResolve = null\n      r()\n    }\n  }\n\n  const isDone = () => state === MergeState.Done\n\n  function drainPending() {\n    if (!controller || isDone()) return\n    while (pendingWriteHead < pendingWrites.length) {\n      const ds = controller.desiredSize\n      if (ds !== null && ds <= 0) return\n      const next = pendingWrites[pendingWriteHead]!\n      // Release reference for GC; compact when fully drained.\n      pendingWrites[pendingWriteHead] = ''\n      pendingWriteHead++\n      pendingWriteChars -= next.length\n      try {\n        controller.enqueue(textEncoder.encode(next))\n      } catch (error) {\n        safeError(error)\n        cleanup(error)\n        return\n      }\n    }\n    // Fully drained: reset array so it doesn't grow unbounded across SSR.\n    if (pendingWriteHead >= pendingWrites.length) {\n      pendingWrites.length = 0\n      pendingWriteHead = 0\n    }\n    // If we've flushed everything and tryFinish requested close, close now.\n    if (closeWhenDrained && pendingWriteHead >= pendingWrites.length) {\n      closeWhenDrained = false\n      safeClose()\n      cleanup(undefined, false)\n    }\n  }\n\n  /**\n   * Enqueue a string chunk through the backpressure queue. Stored as a\n   * string and encoded only when the downstream actually accepts the chunk\n   * — keeps native-memory pressure inside the controller's queue (which\n   * honors desiredSize) rather than ours.\n   */\n  function writeChunk(chunk: string) {\n    if (cleanedUp || isDone()) return\n    if (!chunk.length) return\n    if (pendingWriteChars + chunk.length > MAX_PENDING_WRITE_CHARS) {\n      const err = new Error('SSR stream pending output exceeded maximum buffer')\n      safeError(err)\n      cleanup(err)\n      return\n    }\n    pendingWrites.push(chunk)\n    pendingWriteChars += chunk.length\n    drainPending()\n  }\n\n  function safeClose() {\n    if (isDone()) return\n    state = MergeState.Done\n    try {\n      controller?.close()\n    } catch {\n      // ignore\n    }\n  }\n\n  function safeError(error: unknown) {\n    if (isDone()) return\n    state = MergeState.Done\n    try {\n      controller?.error(error)\n    } catch {\n      // ignore\n    }\n  }\n\n  /**\n   * Cleanup with guards; must be idempotent.\n   */\n  function cleanup(reason?: unknown, cancelReader = true) {\n    if (cleanedUp) return resolvedPromise\n    cleanedUp = true\n\n    try {\n      stopListeningToInjectedHtml?.()\n      stopListeningToSerializationFinished?.()\n    } catch {\n      // ignore\n    }\n    stopListeningToInjectedHtml = undefined\n    stopListeningToSerializationFinished = undefined\n\n    if (serializationTimeoutHandle !== undefined) {\n      clearTimeout(serializationTimeoutHandle)\n      serializationTimeoutHandle = undefined\n    }\n    if (lifetimeTimeoutHandle !== undefined) {\n      clearTimeout(lifetimeTimeoutHandle)\n      lifetimeTimeoutHandle = undefined\n    }\n\n    clearPendingRouterHtml()\n    leftover = ''\n    pendingTail = ''\n    clearPending()\n\n    if (cancelReader) {\n      // Notify the producer immediately. Reader cancellation may take time to\n      // settle, and upstream renderers must tolerate abort + cancel overlap.\n      notifyAbort(reason)\n    }\n    const readerDone = cancelReader\n      ? readerState.cancel(reason)\n      : (readerState.release(), resolvedPromise)\n    signalDrain()\n    try {\n      serverSsr.cleanup()\n    } catch (error) {\n      console.error('Error in SSR cleanup:', error)\n    }\n    return readerDone\n  }\n\n  const textDecoder = new TextDecoder()\n\n  // Router-injected scripts/HTML waiting for the next safe body boundary.\n  // Keep chunks separate so flushing does not flatten a large rope string.\n  const pendingRouterHtml: Array<string> = []\n  let pendingRouterHtmlChars = 0\n\n  // between-chunk text buffer; keep bounded to avoid unbounded memory\n  let leftover = ''\n\n  // captured bytes from </body> onward; must stay behind router scripts.\n  let pendingTail = ''\n\n  let streamBarrierLifted = false\n  let streamBarrierMarkerSeen = false\n  let serializationFinished = false\n\n  function noteBarrierMarker(chunk: string) {\n    if (streamBarrierMarkerSeen) return\n    if (chunk.includes(TSR_SCRIPT_BARRIER_ID)) {\n      streamBarrierMarkerSeen = true\n    }\n  }\n\n  function liftBarrierAfterBoundary() {\n    if (streamBarrierLifted) return\n    if (!streamBarrierMarkerSeen) return\n    streamBarrierLifted = true\n    serverSsr.liftScriptBarrier()\n  }\n\n  const stream = new ReadableStream<Uint8Array>({\n    start(c) {\n      controller = c\n      // If anything queued before start (shouldn't happen but be safe), drain.\n      drainPending()\n    },\n    pull() {\n      // Consumer has capacity; flush queue then unblock read loop.\n      drainPending()\n      signalDrain()\n    },\n    cancel(reason) {\n      state = MergeState.Done\n      return cleanup(reason)\n    },\n  })\n\n  function drainRouterHtml() {\n    if (cleanedUp || isDone()) return\n    let html: string | undefined\n    try {\n      html = serverSsr.takeBufferedHtml()\n    } catch (error) {\n      safeError(error)\n      cleanup(error)\n      return\n    }\n    if (!html) return\n    if (state >= MergeState.Draining) {\n      // At this point final tail/close has already been queued. Emitting late\n      // router HTML would put scripts after </body> or drop them silently.\n      const err = new Error(\n        'SSR router HTML injected after stream finalization',\n      )\n      safeError(err)\n      cleanup(err)\n      return\n    }\n    if (state === MergeState.HoldingTail) {\n      flushPendingRouterHtml()\n      writeChunk(html)\n    } else {\n      if (pendingRouterHtmlChars + html.length > MAX_ROUTER_HTML_CHARS) {\n        const err = new Error('SSR router HTML exceeded maximum buffer')\n        safeError(err)\n        cleanup(err)\n        return\n      }\n      pendingRouterHtml.push(html)\n      pendingRouterHtmlChars += html.length\n    }\n  }\n\n  function flushPendingRouterHtml() {\n    if (!pendingRouterHtml.length) return\n    for (const html of pendingRouterHtml) {\n      writeChunk(html)\n    }\n    clearPendingRouterHtml()\n  }\n\n  function clearPendingRouterHtml() {\n    pendingRouterHtml.length = 0\n    pendingRouterHtmlChars = 0\n  }\n\n  function appendTail(chunk: string) {\n    pendingTail += chunk\n    if (pendingTail.length > MAX_TAIL_CHARS) {\n      throw new Error('SSR stream tail exceeded maximum buffer')\n    }\n  }\n\n  function waitForBackpressure() {\n    return !!(\n      controller &&\n      controller.desiredSize !== null &&\n      controller.desiredSize <= 0\n    )\n  }\n\n  function startSerializationTimeout() {\n    if (cleanedUp || isDone()) return\n    if (serializationTimeoutHandle !== undefined) return\n    const timeoutMs = opts?.timeoutMs ?? DEFAULT_SERIALIZATION_TIMEOUT_MS\n    serializationTimeoutHandle = setTimeout(() => {\n      if (!cleanedUp && !isDone()) {\n        const err = new Error('Serialization timeout after app render finished')\n        console.error('Serialization timeout after app render finished')\n        safeError(err)\n        cleanup(err)\n      }\n    }, timeoutMs)\n  }\n\n  /**\n   * Finish only when app done and serialization complete. Queues final\n   * output and requests close-when-drained so we don't close ahead of\n   * pending writes still waiting on downstream capacity.\n   */\n  function tryFinish() {\n    if (state !== MergeState.AppDone || !serializationFinished) return\n    if (cleanedUp || isDone()) return\n\n    if (serializationTimeoutHandle !== undefined) {\n      clearTimeout(serializationTimeoutHandle)\n      serializationTimeoutHandle = undefined\n    }\n\n    drainRouterHtml()\n    if (cleanedUp || isDone()) return\n\n    // Flush any remaining bytes in the TextDecoder\n    const decoderRemainder = textDecoder.decode()\n\n    if (leftover) writeChunk(leftover)\n    if (cleanedUp || isDone()) return\n    if (decoderRemainder) writeChunk(decoderRemainder)\n    if (cleanedUp || isDone()) return\n    flushPendingRouterHtml()\n    if (cleanedUp || isDone()) return\n    if (pendingTail) writeChunk(pendingTail)\n    if (cleanedUp || isDone()) return\n\n    leftover = ''\n    pendingTail = ''\n\n    state = MergeState.Draining\n    closeWhenDrained = true\n    // Try immediately; if queue not drained yet, pull() will retry.\n    drainPending()\n  }\n\n  function finishAppRendering() {\n    if (state >= MergeState.AppDone) return\n    state = MergeState.AppDone\n    try {\n      serverSsr.setRenderFinished()\n    } catch (error) {\n      safeError(error)\n      cleanup(error)\n      return\n    }\n    drainRouterHtml()\n    if (cleanedUp || isDone()) return\n    serializationFinished =\n      serializationFinished || serverSsr.isSerializationFinished()\n    if (serializationFinished) {\n      tryFinish()\n    } else {\n      startSerializationTimeout()\n    }\n  }\n\n  // Safety net: cleanup even if consumer never reads\n  const timeoutMs = opts?.timeoutMs ?? DEFAULT_SERIALIZATION_TIMEOUT_MS\n  const lifetimeMs = opts?.lifetimeMs ?? timeoutMs * 2\n  lifetimeTimeoutHandle = setTimeout(() => {\n    if (!cleanedUp && !isDone()) {\n      const err = new Error('Stream lifetime exceeded')\n      console.warn(\n        `SSR stream transform exceeded maximum lifetime (${lifetimeMs}ms), forcing cleanup`,\n      )\n      safeError(err)\n      cleanup(err)\n    }\n  }, lifetimeMs)\n\n  stopListeningToInjectedHtml = serverSsr.onInjectedHtml(() => {\n    drainRouterHtml()\n  })\n\n  stopListeningToSerializationFinished = serverSsr.onSerializationFinished(\n    () => {\n      serializationFinished = true\n      drainRouterHtml()\n      tryFinish()\n    },\n  )\n\n  // Subscriptions are installed before snapshots, so missed events are\n  // recovered by these synchronous drains/rechecks.\n  drainRouterHtml()\n  if (cleanedUp || isDone()) return stream\n  serializationFinished =\n    serializationFinished || serverSsr.isSerializationFinished()\n  if (serializationFinished) {\n    drainRouterHtml()\n    if (cleanedUp || isDone()) return stream\n  }\n\n  // Transform the appStream\n  ;(async () => {\n    try {\n      while (true) {\n        // Backpressure: pause upstream reads while downstream is full.\n        if (waitForBackpressure()) {\n          await waitForDrain()\n          if (cleanedUp || isDone()) return\n        }\n\n        const { done, value } = await readerState.reader.read()\n        if (done) break\n\n        if (cleanedUp || isDone()) return\n\n        const text =\n          typeof value === 'string'\n            ? value\n            : textDecoder.decode(value as ArrayBufferView, { stream: true })\n\n        const chunkString = leftover ? leftover + text : text\n\n        // If we already saw </body>, everything else is tail. Keep it bounded\n        // and held until router scripts are ready so injection remains before </body>.\n        if (state >= MergeState.HoldingTail) {\n          appendTail(chunkString)\n          leftover = ''\n          continue\n        }\n\n        const boundary = findHtmlBoundary(chunkString)\n        if (boundary < -1) {\n          const bodyEndIndex = -boundary - 2\n          state = MergeState.HoldingTail\n          appendTail(chunkString.slice(bodyEndIndex))\n          const bodyChunk = chunkString.slice(0, bodyEndIndex)\n          writeChunk(bodyChunk)\n          if (cleanedUp || isDone()) return\n          noteBarrierMarker(bodyChunk)\n          liftBarrierAfterBoundary()\n          if (cleanedUp || isDone()) return\n          flushPendingRouterHtml()\n          leftover = ''\n          continue\n        }\n\n        const lastClosingTagEnd = boundary\n\n        if (lastClosingTagEnd > 0) {\n          const safeChunk = chunkString.slice(0, lastClosingTagEnd)\n          writeChunk(safeChunk)\n          if (cleanedUp || isDone()) return\n          noteBarrierMarker(safeChunk)\n          liftBarrierAfterBoundary()\n          if (cleanedUp || isDone()) return\n          flushPendingRouterHtml()\n\n          leftover = chunkString.slice(lastClosingTagEnd)\n          if (leftover.length > MAX_LEFTOVER_CHARS) {\n            // Ensure bounded memory even if a consumer streams long text sequences\n            // without any closing tags. This may reduce injection granularity but is correct.\n            noteBarrierMarker(leftover)\n            const flushed = leftover.slice(\n              0,\n              leftover.length - MAX_LEFTOVER_CHARS,\n            )\n            writeChunk(flushed)\n            leftover = leftover.slice(-MAX_LEFTOVER_CHARS)\n          }\n        } else {\n          // No closing tag found; keep small tail to handle split closing tags,\n          // but stream older bytes to prevent unbounded buffering.\n          const combined = chunkString\n          if (combined.length > MAX_LEFTOVER_CHARS) {\n            noteBarrierMarker(combined)\n            const flushUpto = combined.length - MAX_LEFTOVER_CHARS\n            const flushed = combined.slice(0, flushUpto)\n            writeChunk(flushed)\n            leftover = combined.slice(flushUpto)\n          } else {\n            leftover = combined\n          }\n        }\n      }\n\n      if (cleanedUp || isDone()) return\n\n      finishAppRendering()\n    } catch (error) {\n      if (cleanedUp) return\n      console.error('Error reading appStream:', error)\n      if (state < MergeState.AppDone) {\n        try {\n          serverSsr.setRenderFinished()\n        } catch {\n          // ignore\n        }\n      }\n      safeError(error)\n      cleanup(error)\n    } finally {\n      readerState.release()\n    }\n  })().catch((error) => {\n    if (cleanedUp) return\n    console.error('Error in stream transform:', error)\n    safeError(error)\n    cleanup(error)\n  })\n\n  return 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