@vnedyalk0v/react19-simple-maps

Create beautiful, interactive SVG maps in React with d3-geo and topojson using a declarative, TypeScript-first API built exclusively for React 19+.

🍴 This is a modernized fork of the original react-simple-maps by Richard Zimerman, completely rewritten with full TypeScript support, React 19 compatibility, and modern development practices by Georgi Nedyalkov.

✨ Key Features

• 🔒 Zero Security Vulnerabilities - Completely secure dependencies with built-in security features
• 📝 Full TypeScript Support - Strict typing with comprehensive type definitions and branded types
• ⚛️ React 19+ Exclusive - Built exclusively for React 19+ with cutting-edge features and patterns
• 🚀 Modern Build System - ESM, CJS, and UMD builds with tree-shaking support
• 🧪 Comprehensive Testing - 100% test coverage with 159 tests using Vitest
• 📦 Optimized Bundle - Smaller bundle size with better performance than alternatives
• 🛡️ Enterprise Security - Built-in SRI validation, HTTPS enforcement, and content validation
• 🎯 Developer Experience - Excellent IntelliSense, error boundaries, and debugging support

📋 Quick Links

• 📦 npm Package - Install from npm registry
• 📦 GitHub Packages - Alternative installation source
• 📚 Live Examples - Interactive demos with source code
• 📝 Changelog - See what's new!
• 🐛 Issues - Report bugs or request features
• 💬 Discussions - Community support and ideas

Why @vnedyalk0v/react19-simple-maps?

@vnedyalk0v/react19-simple-maps makes working with SVG maps in React effortless. It handles complex tasks like panning, zooming, projections, and rendering optimization while leveraging the power of d3-geo and topojson-client without requiring the entire d3 library.

Since the library leaves DOM work to React, it integrates seamlessly with other React libraries like react-spring for animations and react-annotation for enhanced annotations.

Why Choose This Package:

• 🎯 Declarative API - Build complex maps with simple React components
• 🔧 TypeScript First - Full type safety with branded types and comprehensive IntelliSense
• 🎨 Highly Customizable - Style with CSS-in-JS, regular CSS, or styled-components
• 📱 Touch & Mobile Ready - Built-in pan, zoom, and touch interactions
• 🌍 Universal Map Data - Works with any valid TopoJSON, GeoJSON, or custom data
• ⚡ Performance Optimized - Efficient rendering, updates, and memory management
• 🛡️ Enterprise Security - Built-in security features for production applications
• 🔄 React 19 Native - Leverages latest React features like the use API and enhanced error boundaries

📦 Installation

From npm Registry (Recommended)

# npm
npm install @vnedyalk0v/react19-simple-maps

# yarn
yarn add @vnedyalk0v/react19-simple-maps

# pnpm
pnpm add @vnedyalk0v/react19-simple-maps

From GitHub Packages

# Configure npm to use GitHub Packages for @vnedyalk0v scope
echo "@vnedyalk0v:registry=https://npm.pkg.github.com" >> ~/.npmrc

# Install from GitHub Packages
npm install @vnedyalk0v/react19-simple-maps

Requirements

• React: 19.0.0 or higher (React 19+ exclusive - no backward compatibility)
• TypeScript: 5.0.0 or higher (strongly recommended for best developer experience)
• Node.js: 18.0.0 or higher (for development and build tools)

🔄 Migration from react-simple-maps

Migrating from the original react-simple-maps? We've got you covered!

Quick Migration:

1. npm uninstall react-simple-maps && npm install @vnedyalk0v/react19-simple-maps
2. Update imports: from "react-simple-maps" → from "@vnedyalk0v/react19-simple-maps"
3. Convert coordinates: [lon, lat] → createCoordinates(lon, lat)
4. Update event handlers to use enhanced data parameter

📖 Complete Migration Guide - Detailed step-by-step instructions, breaking changes, and troubleshooting tips.

Peer Dependencies

The package automatically includes these dependencies:

• d3-geo ^3.1.0 - Geographic projections and utilities
• d3-zoom ^3.0.0 - Zoom and pan behavior
• d3-selection ^3.0.0 - DOM selection utilities
• d3-color ^3.1.0 - Color manipulation
• d3-interpolate ^3.0.1 - Value interpolation
• topojson-client ^3.1.0 - TopoJSON parsing and processing

🚀 Quick Start

react19-simple-maps provides a set of composable React components for creating interactive SVG maps. You can combine these components to build everything from simple world maps to complex interactive visualizations.

Basic World Map (JavaScript)

import React from 'react';
import {
  ComposableMap,
  Geographies,
  Geography,
} from '@vnedyalk0v/react19-simple-maps';

// URL to a valid TopoJSON file
const geoUrl = 'https://unpkg.com/world-atlas@2/countries-110m.json';

const MapChart = () => {
  return (
    <ComposableMap
      projection="geoEqualEarth"
      projectionConfig={{
        scale: 147,
        center: [0, 0],
      }}
      width={800}
      height={500}
    >
      <Geographies geography={geoUrl}>
        {({ geographies }) =>
          geographies.map((geo) => (
            <Geography
              key={geo.rsmKey}
              geography={geo}
              style={{
                default: { fill: '#D6D6DA', outline: 'none' },
                hover: { fill: '#F53', outline: 'none' },
                pressed: { fill: '#E42', outline: 'none' },
              }}
            />
          ))
        }
      </Geographies>
    </ComposableMap>
  );
};

export default MapChart;

Interactive Map with TypeScript

import React, { useState } from 'react';
import {
  ComposableMap,
  Geographies,
  Geography,
  Marker,
  ZoomableGroup,
  createCoordinates,
  createScaleExtent,
  createTranslateExtent,
} from '@vnedyalk0v/react19-simple-maps';
import type { Feature, Geometry } from 'geojson';

const geoUrl = 'https://unpkg.com/world-atlas@2/countries-50m.json';

const InteractiveMap: React.FC = () => {
  const [selectedCountry, setSelectedCountry] = useState<string | null>(null);

  const handleGeographyClick = (geography: Feature<Geometry>) => {
    const countryName = geography.properties?.name || 'Unknown';
    setSelectedCountry(countryName);
  };

  return (
    <div>
      {selectedCountry && <p>Selected: {selectedCountry}</p>}

      <ComposableMap projection="geoEqualEarth" width={800} height={500}>
        <ZoomableGroup
          zoom={1}
          center={createCoordinates(0, 0)}
          minZoom={0.5}
          maxZoom={8}
          scaleExtent={createScaleExtent(0.5, 8)}
          translateExtent={createTranslateExtent(
            createCoordinates(-2000, -1000),
            createCoordinates(2000, 1000),
          )}
        >
          <Geographies geography={geoUrl}>
            {({ geographies }) =>
              geographies.map((geo) => (
                <Geography
                  key={geo.rsmKey}
                  geography={geo}
                  onClick={() => handleGeographyClick(geo)}
                  style={{
                    default: {
                      fill:
                        selectedCountry === geo.properties?.name
                          ? '#1976d2'
                          : '#D6D6DA',
                      outline: 'none',
                      stroke: '#FFFFFF',
                      strokeWidth: 0.5,
                    },
                    hover: { fill: '#F53', cursor: 'pointer' },
                    pressed: { fill: '#E42' },
                  }}
                />
              ))
            }
          </Geographies>

          {/* Add a marker for New York */}
          <Marker coordinates={createCoordinates(-74.006, 40.7128)}>
            <circle r={5} fill="#F53" stroke="#fff" strokeWidth={2} />
            <text
              textAnchor="middle"
              y={-10}
              style={{ fontSize: '12px', fill: '#333' }}
            >
              New York
            </text>
          </Marker>
        </ZoomableGroup>
      </ComposableMap>
    </div>
  );
};

export default InteractiveMap;

🎯 Live Examples

Check out our comprehensive examples in the examples/ directory:

• Basic Map - Simple world map with click interactions
• Interactive Map - Advanced features with zoom, pan, and markers

The examples use the Equal Earth projection, which provides an accurate representation of land areas. Learn more about this projection on Shaded Relief and Wikipedia.

🧩 Core Components

ComposableMap

The main wrapper component that provides the SVG context and projection system.

Props:

• projection - Map projection (string name or d3-geo projection function)
• projectionConfig - Configuration for built-in projections
• width, height - SVG dimensions
• className - CSS class name
• debug - Enable debug logging (default: false, opt-in only)
• metadata - Optional metadata for SEO and accessibility

import {
  ComposableMap,
  createCoordinates,
} from '@vnedyalk0v/react19-simple-maps';

<ComposableMap
  projection="geoEqualEarth"
  projectionConfig={{
    scale: 147,
    center: createCoordinates(0, 0),
    rotate: [0, 0, 0],
  }}
  width={800}
  height={600}
  className="my-map"
>
  {/* Map content */}
</ComposableMap>;

Geographies

Renders geographic features from TopoJSON or GeoJSON data with built-in error handling.

Props:

• geography - URL string, TopoJSON object, or GeoJSON FeatureCollection
• parseGeographies - Optional function to transform geography data
• className - CSS class name

import { Geographies, Geography } from '@vnedyalk0v/react19-simple-maps';

<Geographies geography="https://unpkg.com/world-atlas@2/countries-110m.json">
  {({ geographies, outline, borders }) =>
    geographies.map((geo) => (
      <Geography
        key={geo.rsmKey}
        geography={geo}
        onClick={(event) => console.log('Clicked:', geo.properties?.name)}
        onMouseEnter={(event) => console.log('Hover:', geo.properties?.name)}
      />
    ))
  }
</Geographies>;

Geography

Individual geographic feature component with enhanced interaction support.

Enhanced Event Handlers:

All event handlers now receive geographic data as a second parameter:

<Geography
  geography={geo}
  onClick={(event, data) => {
    console.log('Country:', data.geography.properties?.name);
    console.log('Centroid:', data.centroid);
    console.log('Bounds:', data.bounds);
    console.log('Coordinates:', data.coordinates);
  }}
  onMouseEnter={(event, data) => {
    // Access to rich geographic data
  }}
/>

Props:

• geography - GeoJSON feature object
• style - Conditional styling object with default, hover, pressed states
• Enhanced event handlers: onClick, onMouseEnter, onMouseLeave, onFocus, onBlur
  • All handlers receive (event, GeographyEventData) parameters

ZoomableGroup

Provides zoom and pan functionality with configurable constraints. Supports both simple and advanced APIs.

Simple API (Recommended):

import { ZoomableGroup, createZoomConfig, createPanConfig } from '@vnedyalk0v/react19-simple-maps';

// Easy zoom configuration
<ZoomableGroup
  zoom={1}
  center={createCoordinates(0, 0)}
  {...createZoomConfig(0.5, 8)} // minZoom, maxZoom
>
  {/* Content */}
</ZoomableGroup>

// Or use direct props
<ZoomableGroup
  zoom={1}
  center={createCoordinates(0, 0)}
  minZoom={0.5}
  maxZoom={8}
  enableZoom={true}
>
  {/* Content */}
</ZoomableGroup>

Props:

• zoom - Current zoom level
• center - Center coordinates
• minZoom, maxZoom - Zoom level constraints (simple API)
• enableZoom, enablePan - Enable/disable behaviors (simple API)
• scaleExtent - Alternative to minZoom/maxZoom using branded types
• translateExtent - Pan boundaries
• filterZoomEvent - Custom zoom event filtering
• onMoveStart, onMove, onMoveEnd - Movement event handlers

import {
  ZoomableGroup,
  createCoordinates,
  createScaleExtent,
  createTranslateExtent,
} from '@vnedyalk0v/react19-simple-maps';

// Approach 1: Using enableZoom/enablePan with explicit constraints
<ZoomableGroup
  zoom={1}
  center={createCoordinates(0, 0)}
  enableZoom={true}
  minZoom={0.5}
  maxZoom={8}
  scaleExtent={createScaleExtent(0.5, 8)}
  enablePan={true}
  translateExtent={createTranslateExtent(
    createCoordinates(-1000, -500),
    createCoordinates(1000, 500),
  )}
  onMoveEnd={(position) => console.log('New position:', position)}
>
  {/* Zoomable content */}
</ZoomableGroup>

// Approach 2: Simplified with just constraints
<ZoomableGroup
  zoom={1}
  center={createCoordinates(0, 0)}
  minZoom={0.5}
  maxZoom={8}
  translateExtent={createTranslateExtent(
    createCoordinates(-1000, -500),
    createCoordinates(1000, 500),
  )}
>
  {/* Zoomable content */}
</ZoomableGroup>;

Marker

Add custom markers to specific coordinates on your map.

Props:

• coordinates - Geographic coordinates using branded types
• className - CSS class name
• Event handlers: onClick, onMouseEnter, onMouseLeave, onFocus, onBlur

import { Marker, createCoordinates } from '@vnedyalk0v/react19-simple-maps';

<Marker coordinates={createCoordinates(-74.006, 40.7128)}>
  <circle r={5} fill="#F53" stroke="#fff" strokeWidth={2} />
  <text textAnchor="middle" y={-10} style={{ fontSize: '12px' }}>
    New York
  </text>
</Marker>;

Annotation

Create annotations with connector lines pointing to specific locations.

Props:

• subject - Target coordinates
• dx, dy - Offset from subject
• curve - Connector curve amount
• connectorProps - SVG props for the connector line

import { Annotation, createCoordinates } from '@vnedyalk0v/react19-simple-maps';

<Annotation
  subject={createCoordinates(-74.006, 40.7128)}
  dx={-90}
  dy={-30}
  connectorProps={{
    stroke: '#FF5533',
    strokeWidth: 2,
    strokeLinecap: 'round',
  }}
>
  <text textAnchor="end" alignmentBaseline="middle" fill="#F53">
    New York City
  </text>
</Annotation>;

Additional Components

• Line - Draw lines between coordinates
• Graticule - Add coordinate grid lines
• Sphere - Add map outline/background
• GeographyErrorBoundary - React 19 error boundary for geography loading

📝 TypeScript Support

The package includes comprehensive TypeScript definitions with strict typing and branded types for enhanced type safety.

Branded Types for Coordinates

import {
  createCoordinates,
  createLongitude,
  createLatitude,
  createScaleExtent,
  createTranslateExtent,
} from '@vnedyalk0v/react19-simple-maps';

// Branded types prevent coordinate mistakes
const longitude = createLongitude(-74.006); // Type: Longitude
const latitude = createLatitude(40.7128); // Type: Latitude
const coordinates = createCoordinates(-74.006, 40.7128); // Type: Coordinates

// Scale and translate extents
const scaleExtent = createScaleExtent(0.5, 8);
const translateExtent = createTranslateExtent(
  createCoordinates(-1000, -500),
  createCoordinates(1000, 500),
);

Geography Utilities

Extract geographic data from features for enhanced interactions:

import {
  getGeographyCentroid,
  getGeographyBounds,
  getBestGeographyCoordinates,
  isValidCoordinates,
} from '@vnedyalk0v/react19-simple-maps';

// Extract centroid for map centering
const centroid = getGeographyCentroid(geography);
if (centroid) {
  setMapCenter(centroid);
}

// Get bounding box for zoom-to-fit
const bounds = getGeographyBounds(geography);
if (bounds) {
  const [southwest, northeast] = bounds;
  // Use bounds for map fitting
}

// Get best available coordinates
const coords = getBestGeographyCoordinates(geography);

Component Props and Event Handlers

import type {
  ComposableMapProps,
  GeographyProps,
  GeographyEventData,
  MarkerProps,
  ProjectionConfig,
  Position,
  SimpleZoomableGroupProps,
} from '@vnedyalk0v/react19-simple-maps';
import type { Feature, Geometry } from 'geojson';

// Typed projection configuration
const projectionConfig: ProjectionConfig = {
  scale: 147,
  center: createCoordinates(0, 0),
  rotate: [0, 0, 0],
};

// Enhanced event handlers with geographic data
const handleGeographyClick = (
  event: React.MouseEvent,
  data: GeographyEventData,
) => {
  console.log('Country:', data.geography.properties?.name);
  console.log('Centroid:', data.centroid);
  if (data.centroid) {
    setMapCenter(data.centroid);
  }
};

const handleZoomEnd = (position: Position) => {
  console.log('New position:', position.coordinates, 'Zoom:', position.zoom);
};

🗺️ Map Data Sources

The library works with any valid TopoJSON or GeoJSON data, giving you complete flexibility in map visualization.

Recommended Data Sources

• 🌍 Natural Earth - High-quality public domain map data at multiple scales
• 🗺️ TopoJSON Collection - Ready-to-use TopoJSON files for various regions
• 🌐 World Atlas - Comprehensive world and country boundaries
• 📊 World Bank Data - Official administrative boundaries
• 🏛️ US Atlas - Detailed US states, counties, and congressional districts

Popular Geography URLs

// World maps
const worldCountries = 'https://unpkg.com/world-atlas@2/countries-110m.json';
const worldCountriesDetailed = 'https://unpkg.com/world-atlas@2/countries-50m.json';

// US maps
const usStates = 'https://unpkg.com/us-atlas@3/states-10m.json';
const usCounties = 'https://unpkg.com/us-atlas@3/counties-10m.json';

// Usage
<Geographies geography={worldCountries}>
  {({ geographies }) => /* render countries */}
</Geographies>

Creating Custom Maps

To create your own TopoJSON maps from shapefiles:

1. GDAL/OGR - Convert shapefiles to GeoJSON
2. TopoJSON CLI - Convert GeoJSON to TopoJSON
3. Mapshaper - Simplify and optimize map data

Tutorial: "How to convert and prepare TopoJSON files for interactive mapping with d3"

🚀 Advanced Features

Built-in Projections

The library supports all major d3-geo projections out of the box:

// Popular projections
<ComposableMap projection="geoEqualEarth" />      // Equal area, good for world maps
<ComposableMap projection="geoMercator" />        // Web maps standard
<ComposableMap projection="geoNaturalEarth1" />   // Compromise projection
<ComposableMap projection="geoAlbersUsa" />       // US-specific projection
<ComposableMap projection="geoOrthographic" />    // Globe view

Custom Projections

Use any d3-geo projection or create your own:

import { geoMercator, geoConicEqualArea } from 'd3-geo';

// Custom Mercator
const customMercator = geoMercator()
  .scale(100)
  .translate([400, 300])
  .rotate([-11, 0]);

// Custom conic projection for specific regions
const customConic = geoConicEqualArea()
  .parallels([29.5, 45.5])
  .scale(1000)
  .translate([480, 250])
  .rotate([96, 0]);

<ComposableMap projection={customMercator}>{/* Map content */}</ComposableMap>;

Advanced Zoom and Pan

import {
  ZoomableGroup,
  createCoordinates,
  createTranslateExtent,
} from '@vnedyalk0v/react19-simple-maps';

<ZoomableGroup
  zoom={2}
  center={createCoordinates(-100, 40)}
  minZoom={0.5}
  maxZoom={10}
  translateExtent={createTranslateExtent(
    createCoordinates(-2000, -1000),
    createCoordinates(2000, 1000),
  )}
  filterZoomEvent={(event) => !event.ctrlKey} // Disable zoom with Ctrl
  onMoveStart={(position, event) => console.log('Move started')}
  onMove={(position, event) => console.log('Moving:', position)}
  onMoveEnd={(position, event) => console.log('Move ended:', position)}
>
  {/* Zoomable content */}
</ZoomableGroup>;

🛡️ Enterprise Security Features

The library includes comprehensive security features designed for production applications.

Geography Data Security

import {
  configureGeographySecurity,
  enableDevelopmentMode,
  DEFAULT_GEOGRAPHY_FETCH_CONFIG,
} from '@vnedyalk0v/react19-simple-maps/utils';

// Default: Strict HTTPS-only mode (recommended for production)
// No configuration needed - secure by default

// For development with local geography files:
if (process.env.NODE_ENV === 'development') {
  enableDevelopmentMode(true); // Allows HTTP localhost
}

// Custom security configuration:
configureGeographySecurity({
  STRICT_HTTPS_ONLY: true, // Force HTTPS only
  ALLOW_HTTP_LOCALHOST: false, // Disable HTTP localhost
  TIMEOUT_MS: 5000, // 5 second timeout
  MAX_RESPONSE_SIZE: 10 * 1024 * 1024, // 10MB max
  ALLOWED_CONTENT_TYPES: [
    // Restrict content types
    'application/json',
    'application/geo+json',
  ],
});

Built-in Security Features

• 🔒 HTTPS-only by default - Prevents man-in-the-middle attacks
• 🚫 Private IP blocking - Prevents SSRF attacks
• ⏱️ Request timeout protection - Prevents hanging requests
• 📏 Response size limits - Prevents memory exhaustion
• 🛡️ Content-Type validation - Ensures valid geography data
• 🏠 Configurable localhost access - Safe development mode
• 🔐 Subresource Integrity (SRI) - Tamper-proof external resources
• 🛡️ URL validation - Prevents malicious URLs

Subresource Integrity (SRI)

Protect against tampered external resources with built-in SRI validation:

import {
  configureSRI,
  enableStrictSRI,
  addCustomSRI,
  generateSRIHash,
  generateSRIForUrls,
} from '@vnedyalk0v/react19-simple-maps/utils';

// Enable strict SRI for all external resources
enableStrictSRI();

// Add custom SRI for your geography data
addCustomSRI('https://your-domain.com/data.json', {
  algorithm: 'sha384',
  hash: 'sha384-your-calculated-hash',
  enforceIntegrity: true,
});

// Generate SRI hash for a URL (development utility)
const hash = await generateSRIHash('https://example.com/data.json');
console.log('SRI Hash:', hash);

// Batch generate SRI for multiple URLs
const sriMap = await generateSRIForUrls([
  'https://unpkg.com/world-atlas@2/countries-110m.json',
  'https://unpkg.com/us-atlas@3/states-10m.json',
]);

React 19 Error Boundaries

Built-in error boundaries for robust geography loading:

import { GeographyErrorBoundary } from '@vnedyalk0v/react19-simple-maps';

<GeographyErrorBoundary
  fallback={(error, retry) => (
    <div>
      <p>Failed to load map: {error.message}</p>
      <button onClick={retry}>Retry</button>
    </div>
  )}
  onError={(error) => console.error('Geography error:', error)}
>
  <Geographies geography="https://example.com/map.json">
    {({ geographies }) => /* render geographies */}
  </Geographies>
</GeographyErrorBoundary>

🎨 Styling and Customization

CSS-in-JS Styling

const geographyStyle = {
  default: {
    fill: '#D6D6DA',
    outline: 'none',
    stroke: '#FFFFFF',
    strokeWidth: 0.5,
  },
  hover: {
    fill: '#F53',
    outline: 'none',
    cursor: 'pointer',
  },
  pressed: {
    fill: '#E42',
    outline: 'none',
  },
};

<Geography geography={geo} style={geographyStyle} />;

Conditional Styling

const getCountryStyle = (
  countryName: string,
  selectedCountry: string | null,
) => ({
  default: {
    fill: selectedCountry === countryName ? '#1976d2' : '#D6D6DA',
    outline: 'none',
    stroke: '#FFFFFF',
    strokeWidth: 0.5,
  },
  hover: {
    fill: selectedCountry === countryName ? '#1565c0' : '#F53',
    cursor: 'pointer',
  },
});

<Geography
  geography={geo}
  style={getCountryStyle(geo.properties?.name, selectedCountry)}
/>;

CSS Classes

// Use CSS classes for styling
<ComposableMap className="world-map">
  <Geographies geography={geoUrl} className="countries">
    {({ geographies }) =>
      geographies.map((geo) => (
        <Geography
          key={geo.rsmKey}
          geography={geo}
          className={`country country-${geo.properties?.iso_a2?.toLowerCase()}`}
        />
      ))
    }
  </Geographies>
</ComposableMap>

🔄 Migration from react-simple-maps

This is a complete rewrite focused exclusively on React 19+. No backward compatibility with React 18 or earlier versions.

Key Differences

• React 19+ Exclusive: No support for React 18 or earlier
• Full TypeScript rewrite with strict typing and zero any types
• React 19 features: use API, enhanced error boundaries, improved Suspense
• Modern build system: ESM/CJS/UMD with tree-shaking and source maps
• Updated dependencies: Latest D3 versions with security fixes
• Performance improvements: Smaller bundle size and better rendering
• Enhanced security: Built-in SRI, HTTPS enforcement, and validation
• Branded types: Type-safe coordinates and configuration objects

Migration Steps

1. Upgrade React: Ensure you're using React 19.0.0+
2. Install package: npm install @vnedyalk0v/react19-simple-maps
3. Update imports: Change import paths to the new package
4. Use branded types: Replace coordinate arrays with createCoordinates()
5. Add error boundaries: Wrap geography components for better error handling
6. Update TypeScript: Use the new comprehensive type definitions

🐛 Debugging

The library provides opt-in debugging capabilities to help with development and troubleshooting.

Debug Mode

By default, the library is quiet and produces no console output. You can enable debugging in two ways:

1. Environment Variable (Global)

# Enable debug mode for all maps
REACT_SIMPLE_MAPS_DEBUG=true npm start

# Or in your .env file
REACT_SIMPLE_MAPS_DEBUG=true

2. Component Prop (Per Map)

<ComposableMap debug={true}>{/* Map content */}</ComposableMap>

Debug Output

When enabled, debug mode provides:

• Component render information with React 19 Owner Stack
• Performance metrics for render times
• Error context with detailed stack traces
• Props and state logging for troubleshooting

// Example debug output in console:
// 🗺️ ComposableMap Render
//   Owner Stack: ComposableMap <- App <- Router
//   Props: { width: 800, height: 600, projection: "geoEqualEarth" }

Best Practices

• Production: Always keep debug disabled (debug={false} or omit the prop)
• Development: Enable only when needed for troubleshooting
• CI/CD: Set REACT_SIMPLE_MAPS_DEBUG=false in production environments

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

Development Setup

# Clone the repository
git clone https://github.com/vnedyalk0v/react19-simple-maps.git
cd react19-simple-maps

# Install dependencies
npm install

# Start development with watch mode
npm run dev

# Run tests
npm test

# Run tests with coverage
npm run test:coverage

# Type checking
npm run type-check

# Linting
npm run lint

# Build the package
npm run build

Development Scripts

• npm run dev - Start development with watch mode
• npm run build - Build all output formats (ESM, CJS, UMD)
• npm run test - Run test suite with Vitest
• npm run test:watch - Run tests in watch mode
• npm run test:ui - Run tests with UI interface
• npm run type-check - TypeScript type checking
• npm run lint - ESLint code linting
• npm run format - Format code with Prettier
• npm run analyze - Bundle size analysis

Publishing

The package uses Changesets for version management and automated publishing:

• npm Registry: Automatically published on main branch merges
• GitHub Packages: Also published to GitHub Package Registry
• Changelog: Automatically generated from changesets

📄 License

MIT licensed. Original work Copyright (c) Richard Zimerman 2017. Fork enhancements Copyright (c) Georgi Nedyalkov 2025. See LICENSE for more details.

🔗 Links & Resources

Package Distribution

• 📦 npm Package - Primary distribution
• 📦 GitHub Packages - Alternative source
• 📊 Bundle Analysis - Size and dependencies

Documentation & Examples

• 📚 Live Examples - Interactive demos with source code
• 📝 Changelog - Version history and updates
• 🔒 Security Guide - Security configuration details

Community & Support

• 🐛 Issues - Bug reports and feature requests
• 💬 Discussions - Community support and ideas
• 📧 Maintainer - Direct contact

Original Project

• 🍴 Original react-simple-maps - By Richard Zimerman
• 📖 Original Documentation - Legacy documentation

Built with ❤️ for the React community. Powered by React 19, TypeScript, and modern web standards.