fix(retail): add region tag for node.js - Update rejoin user events

[rebeccaellis]

Description

Fixes #415382524

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• retail/interactive-tutorials/events/rejoin-user-events.js:14, tag retail_rejoin_user_events

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[gemini-code-assist]

Summary of Changes

Hello @rebeccaellis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces minor, yet important, changes to a Node.js sample for the Google Cloud Retail API. The primary goal is to enhance the sample's integration with documentation systems by adding specific region tags, which allows for accurate and automated extraction of code snippets for documentation purposes.

Highlights

• Documentation Tagging: Added [START] and [END] region tags to the rejoin-user-events.js sample file. These tags are crucial for automated documentation generation, ensuring that the code snippet can be correctly extracted and displayed in Google Cloud documentation.

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[gemini-code-assist]

Code Review

This pull request adds region tags to the rejoin-user-events.js Node.js sample. While the tags themselves are correctly placed, my review of the code now enclosed by these tags has identified a significant correctness issue and a point for improvement. There is a missing await on an asynchronous cleanup function, which could lead to test data not being purged correctly. I've also noted the use of a locally-defined enum that would be more robust if replaced by one from the client library. I've detailed these points in a comment on the new start region tag.

[gemini-code-assist]

By adding region tags, this code snippet is now likely to be used in documentation, so it's important to ensure it follows best practices and is free of bugs. I've noticed a couple of issues in the enclosed code:

• Missing await: The call to utils.purgeUserEvents(parent, visitorId) on line 67 is not awaited. purgeUserEvents is an async function, and without await, the main function might complete and the script exit before the purge operation is sent to the server. This would cause the cleanup step to fail silently, leaving test data behind. The fix is to change the line to await utils.purgeUserEvents(parent, visitorId);.

• Hardcoded Enum: The UserEventRejoinScope enum is defined locally on lines 32-36. It's better practice to use the enum provided by the @google-cloud/retail client library, if it's exported. Using the library's enum makes the code more robust against future API changes.

Since I cannot comment directly on the affected lines (67 and 32-36) due to tooling limitations, I'm leaving this comment here on the start of the region tag. Please address these issues to improve the quality of this code sample.