Function streamToString

src/node/runtime/streamUtils.ts:23–45

(stream: ReadableStream<Uint8Array>)

 * Used by SSH and Docker runtimes for capturing command output.
 */
export async function streamToString(stream: ReadableStream<Uint8Array>): Promise<string> {
  const reader = stream.getReader();
  const decoder = new TextDecoder("utf-8");
  // Collect decoded chunks into an array and join at the end.
  // Using += would build a deep V8 ConsString rope; subsequent regex/indexOf
  // on that rope dereferences one pointer per character, causing O(n²)-class
  // hangs on large newline-free payloads (e.g. minified CSS from web_fetch).
  const chunks: string[] = [];

  try {
    while (true) {
      const { done, value } = await reader.read();
      if (done) break;
      chunks.push(decoder.decode(value, { stream: true }));
    }
    // Final flush
    const tail = decoder.decode();
    if (tail) chunks.push(tail);
    return chunks.join("");
  } finally {
    reader.releaseLock();
  }
}