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# FullStackJS Development Guidelines
## 🧠 General Philosophy
Unified best practices for **NestJS Backend**, **NextJS Frontend**, and **Bootstrap-based UI/UX** development in TypeScript environments.
Focus on **clarity**, **maintainability**, **consistency**, and **accessibility** across the entire stack.
---
## ⚙️ TypeScript General Guidelines
### Basic Principles
- Use **English** for all code and documentation.
- Explicitly type all variables, parameters, and return values.
- Avoid `any`; create custom types or interfaces.
- Use **JSDoc** for public classes and methods.
- Export only **one main symbol** per file.
- Avoid blank lines within functions.
### Naming Conventions
| Entity | Convention | Example |
|:--|:--|:--|
| Classes | PascalCase | `UserService` |
| Variables & Functions | camelCase | `getUserInfo` |
| Files & Folders | kebab-case | `user-service.ts` |
| Environment Variables | UPPERCASE | `DATABASE_URL` |
| Booleans | Verb + Noun | `isActive`, `canDelete`, `hasPermission` |
Use full words — no abbreviations — except for standard ones (`API`, `URL`, `req`, `res`, `err`, `ctx`).
---
## 🧩 Functions
- Write short, single-purpose functions (<20 lines).
- Use **early returns** to reduce nesting.
- Use **map**, **filter**, **reduce** instead of loops when suitable.
- Prefer **arrow functions** for short logic, **named functions** otherwise.
- Use **default parameters** over null checks.
- Group multiple parameters into a single object (RO-RO pattern).
- Return typed objects, not primitives.
- Maintain a single abstraction level per function.
---
## 🧱 Data Handling
- Encapsulate data in composite types.
- Use **immutability** with `readonly` and `as const`.
- Perform validations in classes or DTOs, not within business functions.
- Always validate data using typed DTOs.
---
## 🧰 Classes
- Follow **SOLID** principles.
- Prefer **composition over inheritance**.
- Define **interfaces** for contracts.
- Keep classes focused and small (<200 lines, <10 methods, <10 properties).
---
## 🚨 Error Handling
- Use exceptions for unexpected errors.
- Catch only to fix or add context; otherwise, use global error handlers.
- Always provide meaningful error messages.
---
## 🧪 Testing (General)
- Use the **ArrangeActAssert** pattern.
- Use descriptive test variable names (`inputData`, `expectedOutput`).
- Write **unit tests** for all public methods.
- Mock external dependencies.
- Add **acceptance tests** per module using GivenWhenThen.
---
# 🏗️ Backend (NestJS)
### Principles
- **Modular architecture**:
- One module per domain.
- Controller → Service → Model structure.
- DTOs validated with **class-validator**.
- Use **MikroORM** or equivalent for persistence.
- Encapsulate reusable code in a **common module** (`@app/common`):
- Configs, decorators, DTOs, guards, interceptors, notifications, shared services, types, validators.
### Core Functionalities
- Global **filters** for exception handling.
- **Middlewares** for request handling.
- **Guards** for permissions and RBAC.
- **Interceptors** for response transformation and logging.
### Testing
- Use **Jest** for testing.
- Test each controller and service.
- Add `admin/test` endpoint as a smoke test.
---
# 🖥️ Frontend (NextJS / React)
### Developer Profile
Senior-level TypeScript + React/NextJS engineer.
Expert in **TailwindCSS**, **Shadcn/UI**, and **Radix** for UI development.
### Code Implementation Guidelines
- Use **early returns** for clarity.
- Always style with **TailwindCSS** classes.
- Prefer `class:` conditional syntax over ternary operators.
- Use **const arrow functions** for components and handlers.
- Event handlers start with `handle...` (e.g., `handleClick`, `handleSubmit`).
- Include accessibility attributes:
`tabIndex="0"`, `aria-label`, `onKeyDown`, etc.
- Ensure all code is **complete**, **tested**, and **DRY**.
- Always import required modules explicitly.
### UI/UX with React
- Use **semantic HTML**.
- Apply **responsive Tailwind** classes.
- Maintain visual hierarchy with typography and spacing.
- Use **Shadcn** components for consistent UI.
- Keep components small and focused.
---
# 🎨 UI/UX (Bootstrap Integration)
### Key Principles
- Use **Bootstrap 5+** for responsive design and consistent UI.
- Focus on **maintainability**, **readability**, and **accessibility**.
- Use clear and descriptive class names.
### Bootstrap Usage
- Structure layout with **container**, **row**, **col**.
- Use built-in **components** (buttons, modals, alerts, etc.) instead of custom CSS.
- Apply **utility classes** for quick styling (spacing, colors, text, etc.).
- Ensure **ARIA compliance** and semantic markup.
### Form Validation & Errors
- Use Bootstraps built-in validation states.
- Show errors with **alert components**.
- Include labels, placeholders, and feedback messages.
### Dependencies
- Bootstrap (latest CSS + JS)
- Optionally jQuery (for legacy interactive components)
### Bootstrap-Specific Guidelines
- Customize Bootstrap via **Sass variables** and **mixins**.
- Use responsive visibility utilities.
- Avoid overriding Bootstrap; extend it.
- Follow official documentation for examples.
### Performance Optimization
- Include only necessary Bootstrap modules.
- Use CDN for assets and caching.
- Optimize images and assets for mobile.
### Key Conventions
1. Follow Bootstraps naming and structure.
2. Prioritize **responsiveness** and **accessibility**.
3. Keep the file structure organized and modular.
---
# 🔗 Full Stack Integration Guidelines
| Aspect | Backend (NestJS) | Frontend (NextJS) | UI Layer (Bootstrap/Tailwind) |
|:--|:--|:--|:--|
| API | REST / GraphQL Controllers | API hooks via fetch/axios | Components consuming data |
| Validation | `class-validator` DTOs | `zod` / form-level validation | Bootstrap validation feedback |
| Auth | Guards, JWT | NextAuth / cookies | Auth UI states |
| Errors | Global filters | Toasts / modals | Alerts / feedback |
| Testing | Jest (unit/e2e) | Vitest / Playwright | Visual regression |
| Styles | Scoped modules | Tailwind / Shadcn | Bootstrap utilities |
| Accessibility | Guards + filters | ARIA attributes | Semantic HTML |
---
# ✅ Final Notes
- Use a **shared types package** (`@types/shared`) for consistent interfaces.
- Document your modules and APIs.
- Run lint, type-check, and tests before commit.
- Use **Prettier + ESLint** for consistent formatting.
- Prefer **clarity over cleverness** — readable code wins.
---
# 🗂️ DMS-Specific Conventions (Document Management System)
This section extends the general FullStackJS guidelines for projects similar to **npdms.work**, focusing on document approval workflows (RFA, Drawing, Contract, Revision, Transmittal, Report).
## 🧱 Backend Domain Modules
Use modular domain structure per document type:
```
src/
├─ modules/
│ ├─ rfas/
│ ├─ drawings/
│ ├─ contracts/
│ ├─ transmittals/
│ ├─ audit-log/
│ ├─ users/
│ └─ common/
```
### Naming Convention
| Entity | Example |
|:--|:--|
| Table | `rfa_revisions`, `drawing_contracts` |
| DTO | `CreateRfaDto`, `UpdateContractDto` |
| Controller | `rfas.controller.ts` |
| Service | `rfas.service.ts` |
---
## 🧩 RBAC & Permission Control
Use decorators to enforce access rights:
```ts
@RequirePermission('rfa.update')
@Put(':id')
updateRFA(@Param('id') id: string) {
return this.rfaService.update(id);
}
```
### Roles
- **Admin**: Full access to all modules.
- **Editor**: Modify data within assigned modules.
- **Viewer**: Readonly access.
### Permissions
- `rfa.create`, `rfa.update`, `rfa.delete`, `rfa.view`
- `drawing.upload`, `drawing.map`, `drawing.view`
- `contract.assign`, `contract.view`
Seed mapping between roles and permissions via seeder scripts.
---
## 🧾 AuditLog Standard
Log all CRUD and mapping operations:
| Field | Description |
|:--|:--|
| `actor_id` | user performing the action |
| `module_name` | e.g. `rfa`, `drawing` |
| `action` | `create`, `update`, `delete`, `map` |
| `target_id` | primary id of the record |
| `timestamp` | UTC timestamp |
| `description` | contextual note |
Example implementation:
```ts
await this.auditLogService.log({
actorId: user.id,
moduleName: 'rfa',
action: 'update',
targetId: rfa.id,
description: `Updated revision ${rev}`,
});
```
---
## 📂 File Handling
### File Upload Standard
- Upload path: `/storage/{year}/{month}/`
- File naming: `{drawing_code}_{revision}_{timestamp}.pdf`
- Allowed types: `pdf, dwg, docx, xlsx, zip`
- Max size: **50 MB**
- Store outside webroot.
- Serve via secure endpoint `/files/:id/download`.
### Access Control
Each file download must verify user permission (`hasPermission('drawing.view')`).
---
## 📊 Reporting & Exports
| Report | Description |
|:--|:--|
| **Report A** | RFA → Drawings → All Drawing Revisions |
| **Report B** | RFA Revision Timeline vs Drawing Revision |
| **Dashboard KPI** | RFAs, Drawings, Revisions, Transmittals summary |
### Export Rules
- Export formats: CSV, Excel, PDF.
- Provide print view.
- Include source entity link (e.g., `/rfas/:id`).
---
## 🧮 Frontend: DataTable & Form Patterns
### DataTable (ServerSide)
- Endpoint: `/api/{module}?page=1&pageSize=20`
- Must support: pagination, sorting, search, filters.
- Always display latest revision inline (for RFA/Drawing).
### Form Standards
- Dependent dropdowns:
- Contract → Subcategory
- RFA → Related Drawing
- File upload: preview + validation.
- Submit via API with toast feedback.
---
## 🧭 Dashboard & Activity Feed
### Dashboard Cards
- Show latest RFA, Drawing, Transmittal, KPI summary.
- Include quick links to modules.
### Activity Feed
- Display recent AuditLog actions (10 latest).
```ts
// Example response
[
{ user: 'admin', action: 'Updated RFA 023-Rev02', time: '20251104T09:30Z' }
]
```
---
## ✅ Integration Summary
| Aspect | Backend | Frontend | Description |
|:--|:--|:--|
| **File Handling** | Secure storage, token check | Upload/Preview UI | Consistent standard path |
| **RBAC** | `RequirePermission` guard | Hide/disable UI actions | Unified permission logic |
| **AuditLog** | Persist actions | Show in dashboard | Traceable user activity |
| **Reports** | Aggregation queries | Export + Print | Consistent data pipeline |
| **DataTables** | Serverside paging | Filter/Search UI | Scalable dataset management |
---
## 🧩 Recommended Enhancements
- ✅ Add `deleted_at` for soft delete + restore.
- ✅ Fulltext search + date filters.
- ✅ Background job for RFA deadline reminders.
- ✅ Optimize DB with indexes on `rfa_id`, `drawing_id`, `contract_id`.
- ✅ Periodic cleanup for unused file uploads.
---