> ## Documentation Index
> Fetch the complete documentation index at: https://sonamu.cartanova.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Seamless DX
> Development without server restarts, visual Entity management, automatic code synchronization
Sonamu is designed with developer experience as the top priority.
## HMR (Hot Module Replacement)
When you modify code, it's **instantly reflected without server restart**. Whether you modify Entity, Model, or API, 2 seconds is all you need.
```bash theme={null}
# Traditional approach: Modify Entity → Restart server → Wait 30 seconds
# Sonamu approach: Modify Entity → Save → Reflected in 2 seconds ✅
```
```bash theme={null}
# Console output example
🔄 Invalidated:
- src/application/user/user.model.ts (with 8 APIs)
✅ All files are synced!
```
If you make 50 modifications a day? Traditional approach wastes 25 minutes, Sonamu takes only 1.7 minutes.
Learn how the HMR system works internally
## Sonamu UI
Define Entities, manage Subsets, and run Migrations directly in the web UI. No need to edit JSON manually.
Getting started with Sonamu UI
## Fast Feedback Loop
Entity change → Auto-generate types/schemas → Re-register APIs → Update frontend Services — **everything is automatic**.
```mermaid theme={null}
graph LR
A[Entity Change] --> B[Type Generation]
B --> C[Zod Schema]
C --> D[API Re-register]
D --> E[Service Update]
style A fill:#4f46e5,color:#fff
style E fill:#10b981,color:#fff
```
### What Syncer Does
1. **File Change Detection**: Watches filesystem with chokidar
2. **ESM Cache Invalidation**: Clears cache for changed modules and dependencies
3. **Auto Code Generation**: Generates type, schema, and Service files
4. **Module Reload**: Reloads with latest code
5. **API Re-registration**: Re-registers changed API endpoints
The core of the auto-generation system
## Key Features Summary
Instant reflection without restart Modify → Save → Test in 2 seconds
Visual Entity management No JSON editing required
Auto-sync all code Types, schemas, Services
Compile errors on change Prevent runtime errors
## Next Steps
Understand the HMR system
UI usage guide
Auto-generation system
Complete development flow