A serious refactor

CLAUDE.md

@@ -1,8 +1,19 @@
 ## Development Workflow
 
+- Use pnpm as the package manager (configured in package.json)
 - Run pnpm lint before any commit (and after major edits as well).
 - With each commit (and only commit) increment patch version by one. Unless there is a direct instruction to increase minor (or major) version.
 
 ## Code Quality Rules
 
-- NEVER fail silently - always log errors and make failures visible to users when appropriate.
+- NEVER fail silently - always log errors and make failures visible to users when appropriate.
+
+## Type Safety Requirements
+
+- AVOID using `any` types to mask type checking - this defeats the purpose of TypeScript
+- AVOID using `as` casting without proper validation - it bypasses type safety
+- DO import types directly from libraries when available
+- DO use type guards and runtime validation when interfacing with untyped external systems
+- AVOID patterns like `export type WebRInstance = any` - these mask real type safety issues
+- AVOID creating type aliases that just re-export types - import directly instead
+- ALL functions must have explicit return types - this is enforced by ESLint rules

README.md

@@ -1,100 +1,50 @@
-# WebR ggplot2 & dplyr Demo
+# WebR ggplot2 Demo
 
-A minimal Vue.js application demonstrating interactive R data visualization and manipulation using WebR, ggplot2, and dplyr in the browser.
+Interactive R data visualization in the browser using [WebR](https://webr.r-wasm.org/), [ggplot2](https://ggplot2.tidyverse.org/), and Vue.js.
 
-## Features
+## What is it?
 
-- 🎨 **Interactive Code Editor**: Monaco editor with R syntax highlighting
-- 📊 **Built-in Examples**: Pre-configured examples for ggplot2 and dplyr
-- 📁 **CSV Upload**: Drag-and-drop CSV file upload functionality
-- 🖥️ **Real-time Output**: Live R code execution with stdout/stderr display
-- 📈 **Plot Visualization**: SVG plot rendering in the browser
-- 🎯 **Clean Architecture**: Well-organized Vue 3 components with TypeScript
+A web application that runs R code directly in your browser - no server required. Features live code editing, CSV upload, and interactive plots.
 
-## Tech Stack
-
-- **Vue 3** with TypeScript
-- **Vite** for build tooling
-- **WebR** for R in the browser
-- **Monaco Editor** for code editing
-- **ESLint** with strict rules
-- **Prettier** for code formatting
-- **pnpm** for package management
-
-## Quick Start
+## License
 
-1. **Install dependencies**:
-   ```bash
-   pnpm install
-   ```
+MIT License
 
-2. **Run development server**:
-   ```bash
-   pnpm dev
-   ```
+## Author
 
-3. **Build for production**:
-   ```bash
-   pnpm build
-   ```
+Developed by [Piotr Migdal](https://p.migdal.pl/) from [Quesma](https://quesma.com/)
 
-## Usage
+## Installation
 
-1. **Select Examples**: Choose from pre-built examples in the dropdown
-2. **Upload CSV**: Drag and drop CSV files or click to browse
-3. **Edit Code**: Use the Monaco editor to write R code
-4. **Run Code**: Click "Run Code" to execute R scripts
-5. **View Results**: See output, plots, and any errors in the output panel
+Prerequisites:
+- Node.js 18+
+- [pnpm](https://pnpm.io/)
 
-## Example Scripts
+```bash
+# Clone repository
+git clone https://github.com/QuesmaOrg/demo-webr-ggplot.git
+cd demo-webr-ggplot
 
-- **Basic ggplot2**: Simple scatter plot with mtcars dataset
-- **dplyr filtering**: Data manipulation and summarization
-- **Enhanced scatter plot**: Color mapping and trend lines
-- **Bar chart**: Grouped bar charts with custom styling
-- **CSV template**: Template for working with uploaded data
+# Install dependencies
+pnpm install
 
-## Project Structure
+# Start development server
+pnpm dev
 
+# Build for production
+pnpm build
 ```
-src/
-├── components/          # Vue components
-│   ├── CodeEditor.vue   # Monaco editor wrapper
-│   ├── FileUpload.vue   # CSV upload component
-│   ├── ExampleSelector.vue # Example dropdown
-│   └── OutputDisplay.vue   # Results display
-├── composables/         # Vue composables
-│   └── useWebR.ts       # WebR integration logic
-├── data/               # Static data
-│   └── examples.ts     # R code examples
-├── types/              # TypeScript types
-│   └── index.ts        # Type definitions
-├── App.vue             # Main application
-├── main.ts             # Application entry point
-└── style.css           # Global styles
-```
-
-## Development
 
-- **Linting**: `pnpm lint`
-- **Formatting**: `pnpm format`
-- **Type checking**: `pnpm build` (includes vue-tsc)
-
-## WebR Configuration
-
-The application uses WebR with the following packages pre-installed:
-- `ggplot2` for data visualization
-- `dplyr` for data manipulation
-
-WebR is configured with CORS headers and proper service worker setup for browser compatibility.
-
-## Contributing
+## Usage
 
-1. Follow the existing code style (ESLint + Prettier)
-2. Use TypeScript for type safety
-3. Keep components small and focused
-4. Add examples for new R functionality
+1. Open http://localhost:5173 in your browser
+2. Select an example or write your own R code
+3. Upload CSV files via drag & drop
+4. Click "Run Code" to execute
 
-## License
+## Stack
 
-MIT License - feel free to use this project as a starting point for your own WebR applications.
+- [WebR](https://webr.r-wasm.org/) - R in WebAssembly
+- [Vue 3](https://vuejs.org/) + TypeScript
+- [Vite](https://vitejs.dev/) - Build tool
+- [Monaco Editor](https://microsoft.github.io/monaco-editor/) - Code editor

eslint.config.js

@@ -0,0 +1,33 @@
+import pluginVue from 'eslint-plugin-vue'
+import { defineConfigWithVueTs, vueTsConfigs } from '@vue/eslint-config-typescript'
+
+export default defineConfigWithVueTs(
+  {
+    ignores: ['dist/**', 'node_modules/**', '*.d.ts', 'coverage/**', '.vite/**']
+  },
+  pluginVue.configs['flat/recommended'],
+  vueTsConfigs.recommended,
+  {
+    files: ['**/*.{ts,tsx,vue,js,jsx,mjs,cjs}'],
+    rules: {
+      '@typescript-eslint/no-unused-vars': ['error', { 
+        argsIgnorePattern: '^_',
+        varsIgnorePattern: '^_',
+        caughtErrorsIgnorePattern: '^_'
+      }],
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/explicit-function-return-type': 'error',
+      '@typescript-eslint/explicit-module-boundary-types': 'error',
+
+      'vue/multi-word-component-names': 'off',
+      'vue/block-order': ['error', {
+        order: ['script', 'template', 'style']
+      }],
+
+      'no-console': ['warn', { allow: ['warn', 'error'] }],
+      'no-debugger': 'error',
+      'prefer-const': 'error',
+      'no-var': 'error'
+    }
+  }
+)

package.json

@@ -1,35 +1,29 @@
 {
   "name": "webr-ggplot2-demo",
   "private": true,
-  "version": "0.1.6",
+  "version": "0.1.8",
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "vue-tsc --noEmit && vite build",
+    "build": "vite build",
     "preview": "vite preview",
-    "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix --ignore-path .gitignore",
-    "format": "prettier --write src/"
+    "lint": "eslint . --fix"
   },
   "dependencies": {
-    "@monaco-editor/loader": "^1.5.0",
     "monaco-editor": "^0.52.2",
-    "vue": "^3.4.0",
+    "vue": "^3.5.18",
     "webr": "^0.5.4"
   },
   "devDependencies": {
-    "@rushstack/eslint-patch": "^1.3.3",
-    "@tsconfig/node18": "^18.2.2",
-    "@types/node": "^18.19.9",
-    "@vitejs/plugin-vue": "^4.5.2",
-    "@vue/eslint-config-prettier": "^8.0.0",
-    "@vue/eslint-config-typescript": "^12.0.0",
-    "@vue/tsconfig": "^0.5.1",
-    "eslint": "^8.49.0",
-    "eslint-plugin-vue": "^9.17.0",
-    "prettier": "^3.0.3",
-    "typescript": "~5.3.0",
-    "vite": "^5.0.10",
-    "vue-tsc": "^1.8.25"
+    "@types/node": "^24.1.0",
+    "@typescript-eslint/eslint-plugin": "^8.38.0",
+    "@typescript-eslint/parser": "^8.38.0",
+    "@vitejs/plugin-vue": "^6.0.1",
+    "@vue/eslint-config-typescript": "^14.6.0",
+    "eslint": "^9.32.0",
+    "eslint-plugin-vue": "^10.4.0",
+    "typescript": "~5.9.2",
+    "vite": "^7.0.6"
   },
-  "packageManager": "pnpm@10.7.1+sha512.2d92c86b7928dc8284f53494fb4201f983da65f0fb4f0d40baafa5cf628fa31dae3e5968f12466f17df7e97310e30f343a648baea1b9b350685dafafffdf5808"
+  "packageManager": "pnpm@10.7.1"
 }