🤖 I have created a release *beep* *boop*
---


<details><summary>google-gax: 6.11.1</summary>

##
[6.11.1](google-gax-v6.11.0...google-gax-v6.11.1)
(2026-10-06)


### Bug Fixes

* **gax:** Only set resend_count on T4 attempt spans
([#9540](#9540))
([3b3f600](3b3f600))
* **gax:** Widen port to number | string in GrpcClientOptions
([#9542](#9542))
([17978e7](17978e7))
</details>

<details><summary>pubsub: 6.1.1</summary>

##
[6.1.1](pubsub-v6.1.0...pubsub-v6.1.1)
(2026-10-06)


### Bug Fixes

* **pubsub:** Align ClientConfig.port type with gax.GrpcClientOptions
([#9539](#9539))
([4443d6d](4443d6d))
* **test-utils:** Make google-test-utils a private workspace package
([#9525](#9525))
([be25b6f](be25b6f))
</details>

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Reverts PR #9539 as to not break customers.

The `port` type definition was expanded in PR#3542 as a non-breaking
change.

---------

Co-authored-by: Santiago Quiroga <22756465+quirogas@users.noreply.github.com>

…ent_ (#9544)

## Description

Replaces the `.then().catch()` promise chain and
`promise/no-callback-in-promise` ESLint disable comments in
`PubSub.prototype.getClient_` with an `async` IIFE and `try / catch`
block.

## Impact

Prevents synchronous errors thrown inside the `getClient_` callback from
being caught by `.catch(callback)` and invoking the callback a second
time, while satisfying `eslint-plugin-promise` rules without lint
suppressions (follow-up to #9539).

## Changes

- Refactored `PubSub.prototype.getClient_` in
`handwritten/pubsub/src/pubsub.ts` to `await
this.getClientAsync_(config)` inside a `try / catch` block within a
`void (async () => { ... })()` IIFE and invoke `callback(null, client)`
outside the `try / catch` block.
- Removed the two `// eslint-disable-next-line
promise/no-callback-in-promise` comments in
`handwritten/pubsub/src/pubsub.ts`.

## Testing

- Verified existing `getClient_` and `request` unit tests in
`handwritten/pubsub/test/pubsub.ts` pass (`105 passing`).
- Verified `GIT_DIFF_ARG=upstream/main node ./bin/linter.mjs --strict`
passes with zero ESLint errors or warnings and passes TypeScript type
checking.

## Alternatives

- Keep the `.then().catch()` chain with `eslint-disable-next-line
promise/no-callback-in-promise` comments: rejected because if
`callback(null, client)` throws synchronously, `.catch(callback)`
catches that error and invokes `callback` a second time.

## Description
This PR adds a lightweight, `pnpm`-based breaking-change check workflow
as an alternative to the 1,764-line custom TypeScript AST/TypeChecker
script in #9583, without adding any custom script files in `bin/`:

1. **Workspace dependent compilation via `pnpm --filter
"...[HEAD^1...HEAD]"`**: Passes `--config.link-workspace-packages=deep
--config.prefer-workspace-packages=true` to `pnpm` so modified `core/*`
and `handwritten/*` packages are linked and compiled alongside their
downstream workspace dependents (catching cross-package breakages like
#9496 where a `google-gax` change broke `@google-cloud/pubsub`).
2. **Declaration comparison via `pnpm dlx
@api-extractor-tools/change-detector`**: Emits `.d.ts` declarations for
modified TypeScript files (`HEAD^1` vs `HEAD`) and runs `pnpm dlx
@api-extractor-tools/change-detector /tmp/base.d.ts /tmp/head.d.ts
--json`, flagging any removed exports/members (`action === 'removed'`)
or narrowed types (`impact === 'narrowing'`).

## Impact
- **CI / Pull Requests**: Automatically checks `core/*` and
`handwritten/*` TypeScript changes for breaking public API changes and
cross-package compilation regressions.
- **Maintainability**: Only adds
`.github/workflows/breaking-change-check.yaml` (113 lines) with zero
custom `bin/breaking-change-check.mjs` code to maintain.

## Changes
-
[`.github/workflows/breaking-change-check.yaml`](.github/workflows/breaking-change-check.yaml):
Compiles affected packages and workspace dependents via `pnpm --filter
"...[HEAD^1...HEAD]"` and checks modified declarations using `pnpm dlx
@api-extractor-tools/change-detector`.

## Testing
- Verified against #9539 (`4443d6d6b1`) that `pnpm dlx
@api-extractor-tools/change-detector` detects `Narrowed type of
'ClientConfig.port' from 'string | number' to 'number'` (`impact:
"narrowing"`).
- Verified against the revert in #9549 (`d62a64f338`) that widening
`ClientConfig.port` back to `string | number` is classified as `impact:
"widening"` and passes with zero errors.
- Verified `pnpm --config.link-workspace-packages=deep
--config.prefer-workspace-packages=true --filter
"...[17978e7^1...17978e7]" --filter "!./packages/*"` discovers
`@google-cloud/pubsub` and all other `core/*` and `handwritten/*`
dependents of `google-gax` (#9496).

## Alternatives
- **1,764-line custom AST/TypeChecker script in
`bin/breaking-change-check.mjs` (#9583)**: Requires maintaining custom
AST transformation passes, custom module resolution, and undocumented
internal TypeScript `TypeChecker` calls inside this repository.