[jsweep] Clean campaign_labels.cjs

[github-actions]

Summary

Cleaned and modernized campaign_labels.cjs with improved modern JavaScript patterns and comprehensive test coverage.

Changes Made

Code Improvements

• Nullish coalescing: Replaced || with ?? for more precise null/undefined handling in getCampaignLabelsFromEnv()
• Inline function call: Removed intermediate specificLabel variable and inlined formatCampaignLabel() call
• Code clarity: Maintained clean, readable code with proper JSDoc annotations

Test Coverage

Created comprehensive test suite (campaign_labels.test.cjs) with 18 test cases:

formatCampaignLabel tests (8):

• ✅ Simple campaign ID formatting
• ✅ Uppercase to lowercase conversion
• ✅ Space replacement with hyphens
• ✅ Underscore replacement with hyphens
• ✅ Mixed space/underscore handling
• ✅ Numeric campaign IDs
• ✅ Empty string edge case
• ✅ Complex campaign ID patterns

getCampaignLabelsFromEnv tests (10):

• ✅ No campaign ID (disabled)
• ✅ Empty string (disabled)
• ✅ Whitespace only (disabled)
• ✅ Valid campaign ID (enabled with labels)
• ✅ Trimming whitespace
• ✅ Uppercase conversion
• ✅ Space handling
• ✅ Underscore handling
• ✅ Complex campaign ID
• ✅ Numeric campaign ID

Context

Execution Context: Node.js (pure CommonJS module)

This is a utility module that normalizes campaign IDs and retrieves campaign labels from environment variables. It's used by the safe outputs system to add campaign-specific labels to GitHub resources.

Validation Results

All validation checks passed successfully:

• ✅ Formatting: npm run format:cjs - All files formatted correctly
• ✅ Linting: npm run lint:cjs - No linting errors
• ✅ Type checking: npm run typecheck - No type errors (already had @ts-check enabled)
• ✅ Tests: npm run test:js - 18/18 tests passed (100% pass rate)

Stats

• Lines changed: 4 lines modified in source file
• Test file: 138 lines added
• Test cases: 18 comprehensive test cases
• Test coverage: All public functions fully tested with edge cases

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