Svelte-Web-App-N-TIER-Template Svelte Themes

Svelte Web App N Tier Template

A fully functional Web Application Template equipped with all core functionality to build a production app.

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Svelte Web App N-Tier Template: Scalable Svelte + TypeScript MVC Architecture Guide

Architecture Overview

A robust and modular Svelte project template designed to serve as the foundation for building scalable web applications using an N-Tier architecture. This template provides a clean, organized structure with mock API data providers, making it easy to swap in real API integrations tailored to your specific needs. It is built to be the core for future Svelte-based web applications, with flexibility for updates as technology evolves.

Features

  • N-Tier Architecture: Separates concerns into presentation, business logic, and data layers for maintainability and scalability.
  • Svelte & SvelteKit: Leverages SvelteKit for fast, modern web development with server-side rendering and static site generation.
  • Mock API Data Providers: Includes placeholder API responses in src/lib/data to simulate backend interactions, allowing easy replacement with real APIs.
  • TypeScript Support: Fully typed with TypeScript for enhanced developer experience and code reliability.
  • Tailwind CSS: Pre-configured with Tailwind CSS for rapid and responsive UI development.
  • Modular Structure: Organized folder structure to streamline development and customization.
  • Future-Proof: Designed to be updated with emerging technologies and best practices.

Prerequisites

  • Node.js (v18 or higher)
  • npm or pnpm
  • Git

Installation

  1. Clone the repository:

    git clone https://github.com/Natubeast/Svelte-Web-App-N-TIER-Template.git
cd Svelte-Web-App-N-TIER-Template

  2. Install dependencies:

    npm install

    or

    pnpm install

  3. Run the development server:

    npm run dev

    Open your browser at http://localhost:5173 to view the app.

Project Structure

Svelte-Web-App-N-TIER-Template/
├── src/
│   ├── lib/
│   │   ├── components/      # Reusable Svelte components
│   │   ├── data_providers/  # Mock API data providers
│   │   ├── models/          # TypeScript interfaces and data models
│   │   ├── repositories/    # repositories to parse api response into meaningful data for the service layer
│   │   ├── services/        # Business logic and API interaction layer
│   │   ├── states/          # Strongly typed TypeScript classes that control states
│   │   ├── stores/          # All svelte stores, including state stores
│   │   ├── types/           # TypeScript types usually for api responses
│   │   ├── utils/           # Utility functions and helpers
│   │   └── views/           # UI code
│   ├── routes/              # SvelteKit routes and pages
│   ├── test/                # Contains all unit and integration tests
│   └── app.css              # Global styles with Tailwind CSS
├── static/                  # Static assets (images, fonts, etc.)
├── svelte.config.js         # SvelteKit configuration
├── tsconfig.json            # TypeScript configuration
├── package.json             # Project dependencies and scripts
└── README.md                # Project documentation

Usage

This template is designed to be a starting point for Svelte web applications. Key steps to customize it for your project:

  1. Replace Mock API Data Providers:

    • The src/lib/data directory contains mock API responses (e.g., mockDataProvider.ts). Replace these with real API calls specific to your backend.
    • Update the data models in src/lib/models to match the structure of your API’s responses.
    • Modify the service layer in src/lib/services to handle real API interactions.

  2. Update Components:

    • Customize the Svelte components in src/routes and src/lib/components to match your UI requirements.
    • Leverage Tailwind CSS classes for styling or integrate your preferred CSS framework.

  3. Configure Routes:

    • Add or modify routes in src/routes to reflect your application’s navigation structure.
    • Utilize SvelteKit’s file-based routing for dynamic pages or API endpoints.

  4. Extend Business Logic:

    • Update the business logic in src/lib/services to handle your application’s specific requirements.
    • Ensure TypeScript types are updated to maintain type safety.

  5. Deploy:

    • Build the project for production:
      npm run build
    • Deploy to your preferred platform (e.g., Vercel, Netlify, or a custom server) using SvelteKit’s adapters.

Core Concepts

State Management

The application uses Svelte stores for centralized state management, with each feature having its own store:

// src/app/lib/stores/auth.ts
import { writable } from 'svelte/store';

interface AuthState {
  isAuthenticated: boolean;
  loading: boolean;
  error?: string;
}

export const authStore = writable<AuthState>({
  isAuthenticated: false,
  loading: false
});

Data Providers

Handle all external API communications with proper typing:

// src/app/lib/data-providers/api.ts
interface ApiConfig {
  baseUrl: string;
  timeout?: number;
}

class ApiDataProvider {
  constructor(private config: ApiConfig) {}

  async get<T>(endpoint: string): Promise<T> {
    // Implementation
  }

  async post<T>(endpoint: string, data: unknown): Promise<T> {
    // Implementation
  }
}

Repositories

Transform raw API data into strongly-typed models:

// src/app/lib/repositories/userRepository.ts
interface UserModel {
  id: string;
  name: string;
  email: string;
}

export class UserRepository {
  constructor(private apiProvider: ApiDataProvider) {}

  async getUser(id: string): Promise<UserModel> {
    const rawData = await this.apiProvider.get(`/users/${id}`);
    return this.transformToUserModel(rawData);
  }

  private transformToUserModel(data: unknown): UserModel {
    // Transformation logic
  }
}

Services

Contain business logic and orchestrate operations:

// src/app/lib/services/authService.ts
export class AuthService {
  constructor(
    private userRepository: UserRepository,
    private store: Writable<AuthState>
  ) {}

  async login(credentials: LoginCredentials): Promise<void> {
    this.store.update(state => ({ ...state, loading: true }));
    
    try {
      const user = await this.userRepository.getUserByCredentials(credentials);
      this.store.set({
        isAuthenticated: true,
        loading: false,
        currentUser: user
      });
    } catch (error) {
      this.store.update(state => ({
        ...state,
        loading: false,
        error: error.message
      }));
    }
  }
}

Testing Strategy

Unit Tests

// src/tests/unit/services/authService.test.ts
import { test, expect } from '@playwright/test';
import { mockStore } from '../mocks/store.mock';
import { AuthService } from '../../app/lib/services/authService';

describe('AuthService', () => {
  let service: AuthService;

  beforeEach(() => {
    service = new AuthService(mockUserRepository, mockStore);
  });

  test('should handle successful login', async () => {
    // Test implementation
  });
});

Integration Tests

// src/tests/integration/features/login.feature.ts
import { Given, Then, When } from '@cucumber/cucumber';
import { AuthService } from '../../app/lib/services/authService';

Given('the user enters valid credentials', () => {
  // Setup
});

When('they submit the login form', () => {
  // Action
});

Then('they should be authenticated successfully', () => {
  // Assertion
});

Best Practices

  1. Type Safety

    • Use TypeScript interfaces for all data models
    • Implement generic types for reusable components
    • Define clear contracts between layers

  2. State Management

    • Keep stores focused on single features
    • Use derived stores for computed values
    • Implement proper error handling in store updates

  3. Component Architecture

    • Follow container/presenter pattern
    • Keep components pure and focused
    • Use composition over inheritance

  4. Testing

    • Write tests before implementation
    • Mock dependencies appropriately
    • Test both happy paths and edge cases

  5. Code Organization

    • Group related files together
    • Maintain consistent naming conventions
    • Document complex logic and architectural decisions

Getting Started

  1. Set up the project structure as shown above
  2. Install required dependencies:
    npm install svelte @types/svelte typescript jest @testing-library/svelte
  3. Configure TypeScript:
    {
  "compilerOptions": {
 "target": "ES2022",
 "module": "ESNext",
 "strict": true,
 "esModuleInterop": true,
 "skipLibCheck": true,
 "forceConsistentCasingInFileNames": true
  },
  "include": ["src/**/*"]
}

Contributing

Contributions are welcome! To contribute:

  1. Fork the repository.
  2. Create a new branch (git checkout -b feature/your-feature).
  3. Make your changes and commit (git commit -m "Add your feature").
  4. Push to the branch (git push origin feature/your-feature).
  5. Open a pull request.

Please ensure your changes align with the template’s goal of being a reusable, modular foundation for Svelte applications.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Contact

For questions or feedback, open an issue on the GitHub repository or contact the maintainer at natubeast@gmail.com.

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