# 🧱 Micro Frontend Migration Plan (React.js with Module Federation)

## 📌 Overview

This document outlines the plan to convert the existing monolithic React.js application into a **Micro Frontend Architecture** using **Webpack 5 Module Federation**.

## 📐 Architecture Design

### 🎯 Shell (Host App)

The shell application will:
- Manage global layout: **Header**, **LeftNav**, **Main Content**
- Handle routing logic
- Share common libraries (React, React Router, etc.)

### 🧩 Micro Frontends (Remotes)

Each remote will be a separate standalone React application, exposed and consumed via Module Federation.

| Domain Area | Remote Name | Routes (Example) |
|------------------|--------------|-------------------------------------------------------------|
| Auth & Access | `auth` | `/login`, `/onboarding`, `/request-demo` |
| Dashboard | `dashboard` | `/dashboard` |
| Reports | `reports` | `/reports` |
| Expense Mgmt | `expenses` | `/expenses`, `/advances`, `/trips`, `/cards` |
| Order Mgmt | `orders` | `/sales-orders`, `/purchase-orders`, `/products`, `/inventory`, `/invoices` |
| Payment Mgmt | `payments` | `/send-payments`, `/receive-payments`, `/beneficiaries`, `/transactions` , `/accounts` |
| Settings | `settings` | `/settings/*` (add users, roles, profile, inventory items, policy, limits, etc.) |
| Miscellaneous | `misc` | `/analytics`, `/charts`, `/graphs`, `/notifications`, `/activity-log` |

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## 📅 Migration Phases & Timeline

### Phase 1: 🧭 Planning & Setup (Week 1)

- Analyze and document shared dependencies
- Finalize routing and module federation architecture
- Set up shell app with layout and router

**Estimated Time:** 3 days

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### Phase 2: ⚙️ Micro Frontend Extraction (3–5 Weeks)

- `auth` remote
- `dashboard` remote
- `reports` remote 2
- `expenses module` (expenses, advances, trips, cards) remote 2
- `orders module` (sales orders, purchase orders, products, inventory, invoices) remote 3
- `payments module` remote (send, receive, transactions, beneficiaries, accounts) remote 4
- `settings module` (users, roles, profile, inventory items, limits) remote 5

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### Phase 3: 🔌 Integration & Shell Enhancement (2–3 Weeks)

- Connect all remotes to the shell app
- Dynamic loading of federated modules
- Configure routing and fallbacks

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### Phase 4: 🔄 State Sharing & Communication (1-2 Weeks)

- Shared store or event bus (e.g., Redux, Recoil, Context)
- Cross-module messaging and syncing

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### Phase 5: 🧪 Testing

- Adding unit & integration tests & end to end testing

**Estimated Time:** 1–2 weeks

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### Phase 6: 🚀 Staging & Production Rollout

- QA/UAT testing
- Monitor production rollout
- Setup observability/logging (optional)

**Estimated Time:** 1-2 weeks

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## ✅ Summary Timeline

| Phase | Time Estimate |
|-----------------------------|------------------|
| Planning & Setup | 4 days |
| Micro Frontend Extraction | 3 weeks |
| Integration & Shell | 2 weeks |
| State Sharing | 2 weeks |
| Testing & Deployment | 1 week |
| Staging & Rollout | 1 week |

**🕒 Total Estimated Time: ~9–10 Weeks Might vary depending on challanges**

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## 🔁 Optional Enhancements

- Use `Module Federation Plugin (MFP)` for dynamic federation
- Use `latest redux techniques`
- Use `latest Ant.design and making reusable react components and custom hooks` for shared atomic components and common functional use-cases
- Enable `lazy loading` and `code splitting` per route
- Adding `React Testing Library` for unit test cases
- Adding `End to End Testing` using cucumber or cypress
- Adding `Tailwind CSS` using cucumber or cypress

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