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A/B Testing Infrastructure - Setup Complete ✓

Summary

The A/B testing infrastructure has been successfully implemented and the linting issues have been resolved.

Issues Fixed

ESLint Configuration Issue

Problem: The project was using ESLint v9, which has breaking changes and is incompatible with many Next.js plugins.

Solution:

  • Downgraded ESLint from v9.39.2 to v8.57.1
  • Updated the lint script in package.json to use eslint --ext .ts,.tsx,.js,.jsx src
  • Fixed TypeScript configuration syntax errors in tsconfig.json
  • Applied Prettier formatting to all new A/B testing files

TypeScript Configuration

Fixed Issues:

  • Removed trailing comma in compilerOptions (line 37)
  • Fixed malformed include array formatting (line 45)

Dev Server Status

✅ Dev server is now running successfully

A/B Testing Infrastructure

All files have been created and are ready to use:

Configuration

  • ✅ ab-tests/tests.json - Test definitions
  • ✅ ab-tests/README.md - Configuration guide

Backend

  • ✅ src/lib/models/ABTest.ts - MongoDB models
  • ✅ src/lib/abTestUtils.ts - Core utilities
  • ✅ src/lib/abTestMiddleware.ts - Middleware functions

API Routes

  • ✅ src/app/api/abtest/assign/route.ts - Assign variations
  • ✅ src/app/api/abtest/event/route.ts - Log events
  • ✅ src/app/api/abtest/analytics/route.ts - View analytics
  • ✅ src/app/api/abtest/example/route.ts - Example usage

Client-Side

  • ✅ src/lib/clientABTest.ts - React hooks and utilities

Documentation

  • ✅ Milestones.md - Complete milestone documentation

Next Steps

  1. Start using A/B tests: See examples in Milestones.md
  2. Add new tests: Edit ab-tests/tests.json
  3. View analytics: Visit /api/abtest/analytics

Quick Test

# Test assignment
curl -X POST http://localhost:3000/api/abtest/assign \
  -H "Content-Type: application/json" \
  -d '{"testName":"homepage_layout"}'

# Log an event
curl -X POST http://localhost:3000/api/abtest/event \
  -H "Content-Type: application/json" \
  -d '{"testName":"homepage_layout","eventType":"click"}'

# View analytics
curl http://localhost:3000/api/abtest/analytics

Package Changes

Downgraded

  • eslint: 9.39.2 → 8.57.1

Added

  • @eslint/eslintrc: For ESLint v8 compatibility
  • @eslint/js: For ESLint v8 compatibility

All other dependencies remain unchanged.

Status: ✅ All systems operational Date: February 2, 2026