feat: implement TDD improvements for transcript and segment logic (10/10 issues)

[devin-ai-integration]

feat: implement TDD improvements for transcript and segment logic (10/10 issues)

Summary

This PR addresses all 10 identified issues in the transcript handling and segment logic using Test-Driven Development (TDD). Changes include code fixes with comprehensive unit tests, verification tests for existing correct behavior, and documentation of already well-structured code.

Issues Fixed with Code Changes (5/10):

• Issue i editor #1: Partial Hints Index Mismatch - Fixed index adjustment when filtering partial words after final words arrive. Added Map-based tracking to correctly remap hint indices to filtered array positions. Changed filtering condition from > to >= to properly handle consecutive words.

• Issue migration to radix primitive #3: Memory Leak Prevention - Added hard limits (MAX_PARTIAL_WORDS=1000, MAX_PARTIAL_HINTS=1000) to prevent unbounded growth of partial data. Automatically trims oldest words when limits are exceeded with proper index adjustment.

• Issue Component modularization #4: Input Validation - Added validation for channelIndex bounds (0-255) and word timestamp ordering. Throws descriptive errors for invalid inputs instead of silently failing.

• Issue Setup and cleanup Tauri plugins #5: String Matching Logging - Added console.warn when words aren't found in transcript during spacing fixup, including diagnostic context (word, transcript, position, wordIndex).

• Issue Add login page in Tauri #8: Configurable Gap Threshold - Made segment gap threshold configurable via optional maxGapMs parameter in buildSegments(), defaulting to 2000ms for backward compatibility.

Issues Verified Through Tests (2/10):

• Issue editor is working #2: Race Conditions in Partial Word Management - Added comprehensive tests to verify out-of-order partial word handling. Tests confirm that the existing time-based filtering logic (before/after arrays) correctly handles out-of-order partial results without losing words. No code changes needed.

• Issue Update landing page #9: Partial Word Extension Edge Cases - Added comprehensive tests to verify partial word extension logic handles all edge cases correctly (all-partial segments, speaker identity inheritance, gap handling, anonymous segments). Tests confirm existing implementation already handles these cases properly. No code changes needed.

Issues Already Well-Structured (3/10):

• Issue Update landing page #10: Identity Resolution Rule Priority - Rule priority is clearly defined by code structure in applyIdentityRules function (lines 50-54 of pass-resolve-speakers.ts). The ordered array documents the priority: explicit assignment → speaker index mapping → channel mapping → carry forward. Each rule function has early returns that respect previous rules' decisions.

• Issue Add audio format converter in swift crate #6: Complex Segment Extension Logic - The canExtend function is already well-refactored with helper functions canExtendWithSpeakerIdentity and canExtendNonLastSegment in pass-build-segments.ts. Each helper has a single, clear responsibility.

• Issue landing v0 #7: State Mutation in Pipeline - State mutations are localized to rememberIdentity function in pass-resolve-speakers.ts. Reads use immutable SpeakerStateSnapshot type. Mutations are intentional for performance and contained within the pass.

Test Coverage:

• 15 new transcript tests (12 original + 3 for Issue editor is working #2, all passing)
• 8 utils tests including performance test (all passing)
• 10 segment tests (6 for Issue Add login page in Tauri #8 + 4 for Issue Update landing page #9, all passing)
• Total: 33 new unit tests, all passing

Updates Since Last Revision:

• Fixed TypeScript errors in Issue Update landing page #9 tests (removed isFinal property from WordLike objects, imported RuntimeSpeakerHint type)
• Added Issue editor is working #2 tests verifying out-of-order partial word handling
• Added Issue Update landing page #9 tests verifying partial word extension edge cases
• Documented that Issues Update landing page #10, Add audio format converter in swift crate #6, landing v0 #7 are already well-structured in the codebase

Review & Testing Checklist for Human

⚠️ Risk Level: YELLOW - Core logic changes with potential edge cases

• Verify Issues Update landing page #10, Add audio format converter in swift crate #6, landing v0 #7 approach - These 3 issues were addressed by documenting existing well-structured code rather than making changes. Confirm this meets your expectations or if you want additional refactoring/tests.

• Test real recording session - Start a recording and verify that partial transcripts update correctly and final transcripts don't lose words. Pay special attention to speaker hints remaining accurate.

• Verify memory limits are appropriate - The 1000 word/hint limits are arbitrary. Test with a 2+ hour meeting to ensure this doesn't cause issues. Consider if trimming oldest words is the right strategy.

Test Plan

1. Start a recording session with multiple speakers
2. Speak for 5+ minutes with pauses and interruptions
3. Verify transcript updates smoothly without missing words
4. Check that speaker identification remains accurate throughout
5. Stop recording and verify final transcript is complete
6. Check browser console for any unexpected warnings

Notes

• All 33 new unit tests pass locally
• TypeScript typecheck passes
• E2e tests failed due to unrelated WebDriver setup issues (missing binary, not caused by these changes)
• Code formatted with dprint
• Issues editor is working #2 and Update landing page #9 didn't require code changes - existing implementation already handles these cases correctly, verified through comprehensive tests
• Issues Update landing page #10, Add audio format converter in swift crate #6, landing v0 #7 are already well-structured in the codebase and documented in this PR

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Devin Session: https://app.devin.ai/sessions/51e4365e8e604529b6901744a099ad61
Requested by: @yujonglee (yujonglee.dev@gmail.com)

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