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KeyboardWriter - Improvements & Technical Documentation

Overview

This document tracks completed improvements, open tasks, and future plans for the KeyboardWriter project.

Completed Improvements

Phase 3: Advanced Learning Features (Current)

# Improvement Status Files
1 Bilingual Exercise System Done src/data/lessons.ts, src/data/practiceTexts.ts
2 Micro-Lessons (Level 0) Done src/data/lessons.ts (single finger drills)
3 Star Rating System Done src/services/GamificationService.ts
4 Adaptive Learning Service Done src/services/AdaptiveLearningService.ts
5 Exercise Mode Service Done src/services/ExerciseModeService.ts
6 Progress Tracking Service Done src/services/ProgressTrackingService.ts
7 Progress Map Component Done src/components/progress/ProgressMap.ts
8 Performance Charts Component Done src/components/progress/PerformanceCharts.ts

New Exercise Categories

  • Dictation Mode: Audio-based typing exercises
  • Blind Typing Mode: Type without seeing input
  • Time Pressure Mode: Timed challenges with countdown
  • Error Correction Drills: Focus on mistake patterns
  • Warmup Mode: Gentle exercises to start sessions
  • Endurance Mode: Extended typing sessions

Personalized Learning Features

  • Weakness analysis with digraph/pattern detection
  • Adaptive exercise recommendations
  • Difficulty auto-adjustment based on performance
  • Key-specific error tracking and practice suggestions

Progress Tracking Features

  • Daily session recording with WPM/accuracy tracking
  • Weekly summaries with improvement metrics
  • 15 achievement milestones (lessons, stars, WPM, accuracy, time, streaks)
  • Visual learning path map (Canvas-based)
  • Performance comparison charts (week/month/all-time)

Phase 2: Content Expansion

# Improvement Status Files
1 Expanded Programming Exercises Done src/data/programmingExercises.ts
2 Algorithm Exercises Done src/data/algorithmExercises.ts
3 Framework Exercises Done src/data/frameworkExercises.ts
4 SQL Training Done src/pages/SQLTrainingPage.ts
5 Git Training Done src/pages/GitTrainingPage.ts
6 Vim Training Done src/pages/VimTrainingPage.ts
7 Regex Training Done src/pages/RegexTrainingPage.ts
8 Terminal Training Done src/pages/TerminalTrainingPage.ts
9 Keyboard Shortcuts Done src/pages/ShortcutsPage.ts

Phase 1: Core Infrastructure

# Improvement Status Files
1 Unit Tests with Vitest Done src/__tests__/ (108 tests)
2 Logger System Done src/core/Logger.ts
3 Error Handler Done src/core/ErrorHandler.ts
4 Icons Extracted Done src/components/common/Icons.ts
5 Router Class Done src/core/Router.ts
6 Storage Service with Migrations Done src/core/StorageService.ts
7 CSS Modularized Done src/styles/components/, src/styles/layout/
8 Pre-commit Hooks Done .husky/pre-commit, lint-staged
9 CI/CD Pipeline Done .github/workflows/ci.yml
10 i18n System Done src/core/i18n.ts (EN/DE)
11 Code Splitting Done vite.config.ts (37 chunks)
12 Onboarding System Done src/components/onboarding/
13 ESLint Configuration Done .eslintrc.json (0 warnings)

Test Coverage

Test Files:  7 passed (7)
Tests:       108 passed (108)

- Store.test.ts        (15 tests)
- Logger.test.ts       (17 tests)
- EventBus.test.ts     (20 tests)
- LessonService.test.ts       (8 tests)
- TypingEngineService.test.ts (18 tests)
- GamificationService.test.ts (15 tests)
- StorageService.test.ts      (15 tests)

Open Tasks (High Priority)

1. UI Integration of New Components

  • Integrate ProgressMap into LessonsPage
  • Integrate PerformanceCharts into StatisticsPage
  • Add milestones display to AchievementsPage
  • Connect AdaptiveLearningService to lesson recommendations

2. Exercise Mode Implementation

  • Implement Dictation Mode UI (audio playback)
  • Implement Blind Typing Mode UI (hidden input)
  • Implement Time Pressure Mode UI (countdown timer)
  • Implement Error Correction Mode UI (error highlighting)

Open Tasks (Medium Priority)

1. Accessibility (a11y) Improvements

  • Add ARIA labels to interactive elements
  • Improve keyboard navigation
  • Add screen reader support
  • Color contrast improvements

2. App.ts Refactoring

  • Extract template rendering to separate components
  • Implement Page Registry Pattern
  • Reduce file size (~700 lines currently)

3. Console Statements Cleanup

17 files still use console.log/warn/error instead of the Logger service:

  • src/app/App.ts
  • src/pages/StatisticsPage.ts
  • src/pages/LessonsPage.ts
  • src/pages/PracticePage.ts
  • src/services/PythonService.ts
  • And others...

Future Improvements (Low Priority)

Developer Experience

  • Path aliases throughout codebase
  • Better inline documentation
  • API documentation generation

Performance

  • Virtual scrolling for long lists
  • Web Workers for calculations
  • Image lazy loading

Features

  • Multiplayer typing races
  • Cloud sync
  • VS Code extension
  • More programming languages (C#, Swift, Kotlin)
  • API rate limiting for social features

Project Metrics

Metric Value
Unit Tests 108 passing
ESLint Warnings 0
TypeScript Errors 0
Build Status Successful
Bundle Size (main) ~50kB (gzip: 11kB)
Code Splitting 37 chunks
Supported Languages EN, DE
Services 15+
Components 20+
Exercise Modes 6
Milestones 15

Feature Roadmap

Short-term

  • i18n System
  • Unit Tests (108 tests)
  • Code Splitting
  • Onboarding for new users

Medium-term

  • CI/CD Pipeline
  • App.ts refactoring
  • Accessibility improvements

Long-term

  • Virtual scrolling
  • Web Workers
  • Complete API documentation
  • VS Code Extension

Architecture

Tech Stack

Technology Usage
TypeScript Type-safe codebase
Vite Build tool with HMR
Vitest Unit testing
ESLint + Prettier Code quality
Husky Git hooks
GitHub Actions CI/CD

Project Structure

src/
├── __tests__/         # Test files
├── app/               # App entry point
├── components/        # UI components
│   ├── charts/        # Chart components (LineChart, KeyboardHeatmap)
│   ├── common/        # Common components (Icons)
│   ├── keyboard/      # Virtual keyboard
│   ├── onboarding/    # Onboarding modal
│   ├── progress/      # Progress visualization (ProgressMap, PerformanceCharts)
│   ├── settings/      # Settings modal
│   ├── typing-area/   # Typing area component
│   └── visualization/ # Algorithm/Graph visualizers
├── core/              # Core modules (EventBus, Store, Logger, Router, i18n)
├── data/              # Static data (lessons, exercises, shortcuts)
├── domain/            # Domain models and enums
├── pages/             # Page components (20+ pages)
├── services/          # Business logic services (15+ services)
└── styles/            # CSS modules

Key Design Patterns

  • Event-Driven Architecture: Type-safe EventBus for decoupled communication
  • State Management: Centralized Store with subscription pattern
  • Service Layer: Business logic separated from UI (15+ services)
  • Code Splitting: Dynamic imports for optimal loading
  • Adaptive Learning: Pattern-based weakness detection and personalized recommendations
  • Progress Tracking: Session-based analytics with milestone system
  • Canvas Rendering: Hardware-accelerated visualizations for progress map

Development Notes

Running Tests

npm run test        # Watch mode
npm run test:run    # Single run
npm run test:ui     # With UI

Code Quality

npm run lint        # ESLint
npm run format      # Prettier
npm run type-check  # TypeScript

Building

npm run build       # Production build
npm run preview     # Preview build

New Services Reference

AdaptiveLearningService

Provides personalized learning recommendations based on user performance.

  • analyzeWeaknesses(): Identifies weak keys and patterns
  • recommendExercises(): Suggests targeted exercises
  • adjustDifficulty(): Auto-adjusts lesson difficulty

ExerciseModeService

Manages different exercise modes for varied practice.

  • Dictation Mode: Audio-based typing
  • Blind Typing: Hidden input mode
  • Time Pressure: Countdown challenges
  • Error Correction: Mistake-focused drills
  • Warmup/Endurance: Session management

ProgressTrackingService

Comprehensive progress tracking and analytics.

  • Session recording with detailed metrics
  • Weekly/monthly summaries
  • Milestone achievement tracking
  • Performance comparison over time

Last updated: March 21, 2026