Code Review - PR #175

Summary

This PR completes the performance optimization started in #174 by adding the explicit type field to all remaining SDK clients. The changes are minimal, focused, and correctly implemented.

✅ Strengths

1. Consistent Implementation: All four SDK clients correctly add the type field matching their data format:

   • src/sdk/index.js:255 - type: 'base64' ✓
   • clients/vitest/src/setup.js:63 - type: 'file-path' ✓
   • clients/ruby/lib/vizzly.rb:58 - type: 'base64' ✓
   • clients/swift/Sources/Vizzly/VizzlyClient.swift:82 - type: 'base64' ✓

2. Excellent Test Coverage: Server-side tests verify that explicit type parameters skip detection (tests/server/handlers/tdd-handler.test.js:759-804, tests/server/handlers/api-handler.test.js:180-225)

3. Backwards Compatibility: PR ⚡ Skip image type detection when SDK provides explicit type #174 implemented fallback detection, so old clients without type field continue working

4. Complete Analysis: PR description correctly identifies which clients don't need changes:

   • Core client - Already updated in ⚡ Skip image type detection when SDK provides explicit type #174
   • Static-site & Storybook - Use core client SDK (verified in clients/storybook/src/screenshot.js:10 and clients/static-site/src/screenshot.js:10)
   • Ember - Different architecture (sends selector, server takes screenshot - verified in clients/ember/src/launcher/screenshot-server.js:241-256)

5. Clear Documentation: PR body provides excellent table showing which packages need releasing

🔍 Minor Observations

1. No Client-Side Tests: The SDK clients themselves (Ruby, Swift, Vitest) don't have unit tests in this repo that verify the type field is sent. However:

   • Server-side tests confirm the field is used correctly when received
   • The changes are trivial (adding one field to a payload)
   • Tests would need separate test infrastructure for each language
   • Not blocking, but worth noting for future

2. Swift Syntax: The Swift code uses proper dictionary literal syntax (line 82: "type": "base64") - looks good

3. Ruby Syntax: The Ruby code correctly uses symbol keys with string value (line 58: type: 'base64') - consistent with the rest of the payload

🎯 Performance Impact

This PR completes the optimization that eliminates O(n) regex validation on large base64 strings. For multi-megabyte full-page screenshots, this provides significant speedup as the server can now skip expensive type detection entirely.

✅ Recommendation

Approve and merge.

The implementation is correct, well-tested at the integration level, and completes the performance optimization from #174. All four SDK clients now benefit from O(1) type detection on the server.

Post-merge checklist (as noted in PR description):

• Release @vizzly-testing/cli to npm
• Release @vizzly-testing/vitest to npm
• Release vizzly gem to RubyGems
• Release Vizzly Swift package

Review completed: Code quality ✓, Performance ✓, Security ✓, Test coverage ✓