storage 8.0.1: MaxListenersExceededWarning (11 error/close listeners on PassThrough) on every createReadStream()

[glenn-jocher]

Package: @google-cloud/storage (handwritten/storage)

Environment

• @google-cloud/storage 8.0.1 (teeny-request 11.0.1, retry-request 9.0.1)
• Node 26.5.1 (also on Vercel's Node runtime)
• Does not occur with 8.0.0 (teeny-request 9.0.0), same code — 8.0.1's change vs 8.0.0 is that dependency bump (teeny-request 11 moved to node-fetch 3).

Steps to reproduce

import { Storage } from "@google-cloud/storage";
const file = new Storage().bucket("<bucket>").file("<~3 MB object>");
let n = 0;
for await (const chunk of file.createReadStream()) n += chunk.length;

Run with node --trace-warnings.

Actual

Every streamed download emits both:

MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 error listeners added to [PassThrough]. MaxListeners is 10.
    at pipelineImpl (node:internal/streams/pipeline:286:14)
    at pipeline (node:internal/streams/pipeline:183:10)
    at PassThrough.<anonymous> (teeny-request/build/src/index.js:194:43)
MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 close listeners added to [PassThrough]. MaxListeners is 10.
    at eos (node:internal/streams/end-of-stream:302:10)
    at pipe (node:internal/streams/pipeline:447:3)
    at pipelineImpl (node:internal/streams/pipeline:374:25)
    at PassThrough.<anonymous> (teeny-request/build/src/index.js:194:43)

The emitter is the node-fetch 3 response body PassThrough (teeny-request's responseStream in stream mode). Its error listeners when the warning fires are node-fetch's FetchError wrapper, three onError/eos pairs from node-fetch's own internal pipeline calls, teeny-request's (err) => requestStream.emit('error', err) forwarder (index.js:201), and the listeners stream.pipeline(responseStream, requestStream) adds at index.js:194 — the count is reached by library wiring over node-fetch 3's body, not by the caller. (teeny-request's own repo is archived, so reporting here.)

Expected

No warning for a single stream consumer, as with 8.0.0.

Impact

Two warnings per download on any service streaming from GCS, which floods runtime-error dashboards. We have pinned to 8.0.0 meanwhile.