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Gemini CLI Demo

AI/CLI DevelopmentMedium
Started: 2025-08Full-Stack Developer

Project Overview

This project is a showcase of web component-based applications. The showcase is a single-page application that displays a collection of web component apps in a card-based layout. When a card is clicked, the corresponding app is launched in a modal window.

Key Features

•A collection of web component-based applications, including a mind mapping app, a markdown editor, and a shopping cart.
•A single-page application that displays the apps in a card-based layout.
•A modal window to launch the apps.

Technical Implementation

•Web Components: The project is built using Web Components, a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps.
•Functional Programming: Functional programming principles are preferred.
•BEM CSS: BEM (Block, Element, Modifier) naming convention is used for CSS classes.

Development Process

•Test-Driven Development (TDD): TDD is the desired approach.
•Modular Architecture: The project follows a modular architecture, with each app built as a self-contained web component.
•Web Components: Web Components are the primary design pattern used for building the applications.
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Gemini CLI Demo showcase homepage
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Main showcase interface displaying all web component apps

desktop
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Drawing app demonstration
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Interactive drawing application built with Web Components

feature
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Todo list app demonstration
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Functional todo list with local storage persistence

feature
Started:2025-08
Role:Full-Stack Developer
Difficulty:Medium
9 apps
Web Components
Self-contained web component applications
100% Vanilla JS
Code Quality
No framework dependencies, pure web standards
<50KB total
Performance
Lightweight bundle size for all apps
All modern
Browser Support
Works in Chrome, Firefox, Safari, Edge
GitHub RepositoryLive Demo

Technology Stack

Frontend

HTMLCSSJavaScriptWeb Components

Development Tools

GitHubVS Code

Key Features

Showcase App

A single-page application that displays a collection of web component apps in a card-based layout.

Impact: Provides a central location to view all the web component apps.

Mind Mapping App

A web-based mind mapping application with panning, zooming, and local storage.

Impact: Demonstrates the ability to build complex, interactive applications with a variety of features.

Markdown Editor

A web-based markdown editor with a live preview.

Impact: Demonstrates the ability to build practical tools and integrate with third-party libraries.

Shopping Cart

A simple shopping cart with drag-and-drop support.

Impact: Demonstrates the ability to build e-commerce features and handle user interactions.

Technical Highlights

Pure Web Components Architecture

Built six interactive applications using only vanilla JavaScript and Web Components without any framework dependencies.

Key Achievements:

  • Zero framework overhead with native browser APIs
  • True component encapsulation with Shadow DOM
  • Cross-browser compatibility with modern standards

Interactive Application Suite

Comprehensive showcase featuring drawing app, todo list, mind mapping, markdown editor, and shopping cart applications.

Key Achievements:

  • Drag-and-drop functionality in drawing and shopping apps
  • Local storage persistence across all applications
  • Responsive design with mobile touch support

Lightweight Performance

Achieved under 50KB total bundle size for all six applications combined through optimized vanilla JavaScript.

Key Achievements:

  • No build tools or transpilation required
  • Instant loading with minimal network overhead
  • Progressive enhancement with graceful degradation

Insights & Learnings

Lessons Learned

  • Web Components provide true encapsulation without framework overhead
  • BEM CSS methodology scales well even in component-based architecture
  • Functional programming patterns work effectively with vanilla JavaScript
  • Browser native APIs are powerful enough for complex interactions
  • AI can successfully generate working web applications from specifications

Challenges Overcome

  • Managing state across isolated Web Components without a framework
  • Implementing drag-and-drop functionality in the drawing app
  • Ensuring consistent styling with Shadow DOM boundaries
  • Creating a modal system that works with Web Components
  • Handling browser compatibility for newer Web Component features

Future Improvements

  • Add real-time collaboration to the mind mapping app
  • Add cloud sync to the markdown editor
  • Add product variations to the shopping cart
  • Add unit tests for all components
  • Implement PWA features for offline functionality