phase 6 progress

Author: dboskovic

V6_REFACTOR.md

@@ -2,14 +2,14 @@
 
 ## 🚀 Implementation Progress
 
-**Current Status: Phase 5 Complete ✅**
+**Current Status: Phase 6 Complete ✅**
 
 - ✅ **Phase 1: Foundation & Performance Infrastructure** (100% Complete)
 - ✅ **Phase 2: Core Parsing Engine** (100% Complete)
 - ✅ **Phase 3: Heuristics & Algorithms** (100% Complete)
 - ✅ **Phase 4: Streaming Infrastructure** (100% Complete)
 - ✅ **Phase 5: Core Functions** (100% Complete)
-- ⏳ **Phase 6: Workers & Concurrency** (Planned)
+- ✅ **Phase 6: Workers & Concurrency** (100% Complete)
 - ⏳ **Phase 7: Plugin System** (Planned)
 - ⏳ **Phase 8: Public API & Compatibility** (Planned)
 
@@ -59,11 +59,21 @@
 - ✅ Quote handling, formula escape prevention, and delimiter validation
 - ✅ Complete TypeScript implementation with legacy API compatibility
 
-### Next Steps (Phase 6)
-Ready to begin Workers & Concurrency implementation:
-- Worker host orchestration for main thread coordination
-- Worker entry point for standalone worker bundle  
-- Message passing and lifecycle management
+### Recent Achievements (Phase 6)
+- ✅ Worker host orchestration (`src/workers/host.ts`) with main thread coordination
+- ✅ Worker entry point (`src/workers/worker-entry.ts`) for standalone worker bundle
+- ✅ Message passing protocol and lifecycle management matching legacy behavior
+- ✅ Worker blob creation with URL.createObjectURL for cross-browser compatibility
+- ✅ Papa.WORKER_ID global preservation for legacy compatibility
+- ✅ Worker fallback handling when worker creation fails
+- ✅ Complete integration with csv-to-json for seamless worker usage
+- ✅ Foundation tests passing: `bun run ci:foundation`
+
+### Next Steps (Phase 7)
+Ready to begin Plugin System implementation:
+- jQuery plugin extraction as optional sub-package
+- Tree-shakable plugin architecture for modern builds
+- Backward compatibility layer for existing plugin usage
 
 ## Overview
 This document outlines the migration plan from the legacy single-file format (`legacy/papaparse.js`) to a modern, modular TypeScript architecture while maintaining 100% API compatibility and ensuring all tests pass.
@@ -372,14 +382,16 @@ export function escapeRegExp(string: string): string // line 1409
 - [x] **JSON to CSV** - Serialization logic with quote handling
 - [x] **JSON to CSV** - Formula escape prevention
 
-### Workers & Advanced Features
-- [ ] **Worker Host** (`src/workers/host.ts`) - Main thread orchestration
-- [ ] **Worker Entry** (`src/workers/worker-entry.ts`) - Standalone worker entry
-- [ ] **Workers** - Independent worker bundle compilation
-- [ ] **Workers** - Message passing and lifecycle management
-- [ ] **Workers** - Preserve Papa.WORKER_ID global
-- [ ] **Error Handling** (`src/core/errors.ts`) - Standardized error types and factories
-- [ ] **Error Handling** - Error code preservation for compatibility
+### Workers & Advanced Features ✅ COMPLETED
+- [x] **Worker Host** (`src/workers/host.ts`) - Main thread orchestration
+- [x] **Worker Entry** (`src/workers/worker-entry.ts`) - Standalone worker entry
+- [x] **Workers** - Message passing and lifecycle management
+- [x] **Workers** - Preserve Papa.WORKER_ID global
+- [x] **Workers** - Worker blob creation and URL management
+- [x] **Workers** - Fallback handling when worker creation fails
+- [x] **Error Handling** (`src/core/errors.ts`) - Standardized error types and factories
+- [x] **Error Handling** - Error code preservation for compatibility
+- [ ] **Workers** - Independent worker bundle compilation (deferred to build process)
 
 ### Public API & Integration
 - [ ] **Papa Object** (`src/public/papa.ts`) - Static property bag pattern with Object.assign
@@ -569,20 +581,3 @@ bun run ci:all               # Run complete CI test suite
 - `bun run ci:api-test` - API surface testing
 - `bun run ci:all` - Complete test suite
 - `bun run refactor:test` - Alias for foundation tests
-
-**Phase 4 Status: ✅ COMPLETE - Ready for Phase 5 implementation**
-
-## Phase 4 Achievements Summary
-
-✅ **Streaming Infrastructure Complete**
-- Base ChunkStreamer class with progress tracking and parser coordination
-- StringStreamer for memory-efficient string processing with configurable chunking
-- FileStreamer with FileReader API, progress events, and browser compatibility
-- NetworkStreamer for remote files with XMLHttpRequest, range requests, and credentials
-- ReadableStreamStreamer for Node.js streams with proper backpressure handling
-- DuplexStreamStreamer for Node.js duplex streams with piping support
-- Complete TypeScript implementation with proper inheritance patterns
-- All streamers implement coordinated chunk processing and state management
-- Foundation tests passing: `bun run ci:foundation`
-
-The streaming infrastructure layer is now ready for Phase 5 core functions.