Electrobun Debugging

Comprehensive debugging and troubleshooting guide for Electrobun applications.

Development Environment

Basic Development Setup

# Development mode with hot reload
bun run dev

# Development mode with verbose logging
DEBUG=* bun run dev

# Development mode with specific debug namespace
DEBUG=electrobun:* bun run dev

Environment Configuration

.env.development:

# Enable development features
NODE_ENV=development
DEBUG=electrobun:*

# DevTools always open
ELECTRON_ENABLE_DEVTOOLS=1

# Disable security warnings in dev
ELECTRON_DISABLE_SECURITY_WARNINGS=true

# Custom dev server port
DEV_SERVER_PORT=3000

Debugging Main Process

Console Logging

// Main process logs appear in terminal
console.log("Main process started");
console.error("Error in main process");
console.warn("Warning in main process");

// Structured logging
const logger = {
  debug: (msg: string, data?: any) => {
    if (process.env.DEBUG) {
      console.log(`[DEBUG] ${msg}`, data || "");
    }
  },
  info: (msg: string, data?: any) => {
    console.log(`[INFO] ${msg}`, data || "");
  },
  error: (msg: string, error?: any) => {
    console.error(`[ERROR] ${msg}`, error || "");
    if (error?.stack) {
      console.error(error.stack);
    }
  }
};

logger.info("Window created", { width: 1200, height: 800 });
logger.error("Failed to load file", error);

Bun Debugger

# Start with Bun debugger
bun --inspect run dev

# With breakpoint on first line
bun --inspect-brk run dev

# Connect with Chrome DevTools
# Open chrome://inspect in Chrome
# Click "inspect" on your process

Error Handling in Main

// Global error handlers
process.on("uncaughtException", (error) => {
  logger.error("Uncaught exception", error);
  
  // Show error dialog
  dialog.showMessageBox({
    type: "error",
    title: "Application Error",
    message: "An unexpected error occurred",
    detail: error.message,
  });
  
  // Optional: restart or quit
  // app.relaunch();
  // app.quit();
});

process.on("unhandledRejection", (reason, promise) => {
  logger.error("Unhandled rejection", { reason, promise });
});

// Window error handler
win.on("error", (error) => {
  logger.error("Window error", error);
});

// RPC error handling
win.defineRpc({
  handlers: {
    async someHandler(args: any) {
      try {
        // Handler logic
        return { success: true };
      } catch (error) {
        logger.error("RPC handler error", error);
        throw error; // Re-throw to send to webview
      }
    }
  }
});

Debugging Webview

Chrome DevTools

// Open DevTools programmatically
win.openDevTools();

// Open DevTools detached
win.openDevTools({ mode: "detach" });

// Toggle DevTools
win.toggleDevTools();

// Close DevTools
win.closeDevTools();

// Menu item to toggle DevTools
{
  label: "Toggle Developer Tools",
  accelerator: "CmdOrCtrl+Shift+I",
  action: () => win.toggleDevTools()
}

Console Logging in Webview

// Webview console logs appear in DevTools
console.log("Webview initialized");
console.error("Error in webview");
console.warn("Warning in webview");
console.table({ user: "Alice", age: 30 });

// Custom logger
const logger = {
  log: (msg: string, ...args: any[]) => {
    console.log(`[${new Date().toISOString()}] ${msg}`, ...args);
  },
  group: (label: string) => {
    console.group(label);
  },
  groupEnd: () => {
    console.groupEnd();
  }
};

logger.group("User Login");
logger.log("Validating credentials");
logger.log("Fetching user data");
logger.groupEnd();

Capturing Webview Errors

// Global error handler
window.addEventListener("error", (event) => {
  console.error("Uncaught error:", event.error);
  
  // Send to main process for logging
  electroview.rpc.logError({
    message: event.error.message,
    stack: event.error.stack,
    url: event.filename,
    line: event.lineno,
    column: event.colno,
  });
});

// Unhandled promise rejections
window.addEventListener("unhandledrejection", (event) => {
  console.error("Unhandled rejection:", event.reason);
  
  electroview.rpc.logError({
    message: "Unhandled rejection",
    reason: event.reason,
  });
});

// Main process handler
win.defineRpc({
  handlers: {
    async logError(error: any) {
      logger.error("Webview error", error);
      
      // Optional: save to file
      await saveErrorLog(error);
    }
  }
});

Debugging RPC Communication

RPC Logging

// Main process RPC logger
class RpcLogger {
  wrap(handlers: any) {
    const wrapped: any = {};
    
    for (const [name, handler] of Object.entries(handlers)) {
      wrapped[name] = async (...args: any[]) => {
        const callId = Math.random().toString(36).slice(2);
        
        logger.debug(`[RPC:${callId}] → ${name}`, args);
        const startTime = Date.now();
        
        try {
          const result = await (handler as Function)(...args);
          const duration = Date.now() - startTime;
          logger.debug(`[RPC:${callId}] ← ${name} (${duration}ms)`, result);
          return result;
        } catch (error) {
          const duration = Date.now() - startTime;
          logger.error(`[RPC:${callId}] ✗ ${name} (${duration}ms)`, error);
          throw error;
        }
      };
    }
    
    return wrapped;
  }
}

const rpcLogger = new RpcLogger();

win.defineRpc({
  handlers: rpcLogger.wrap({
    async getUser(id: string) {
      return await database.users.findById(id);
    },
    async saveFile(path: string, content: string) {
      await Bun.write(path, content);
      return { success: true };
    }
  })
});

Testing RPC in DevTools

// In webview DevTools console:

// Test RPC call
await electroview.rpc.getUser("123")

// Test error handling
try {
  await electroview.rpc.invalidMethod()
} catch (error) {
  console.error("Expected error:", error);
}

// Measure RPC performance
console.time("RPC call");
const result = await electroview.rpc.getUser("123");
console.timeEnd("RPC call");

Performance Profiling

CPU Profiling

// Main process CPU profiling
const { performance, PerformanceObserver } = require("perf_hooks");

const obs = new PerformanceObserver((items) => {
  items.getEntries().forEach(entry => {
    logger.debug(`${entry.name}: ${entry.duration}ms`);
  });
});

obs.observe({ entryTypes: ["measure"] });

// Measure operation
performance.mark("operation-start");
await expensiveOperation();
performance.mark("operation-end");
performance.measure("operation", "operation-start", "operation-end");

Webview CPU profiling:

// Use Chrome DevTools Performance tab
// Or programmatically:
console.profile("My Operation");
await performOperation();
console.profileEnd("My Operation");

// Simple timing
const start = performance.now();
await operation();
const duration = performance.now() - start;
console.log(`Operation took ${duration}ms`);

Memory Profiling

// Main process memory usage
function logMemoryUsage() {
  const usage = process.memoryUsage();
  logger.info("Memory usage", {
    heapUsed: `${Math.round(usage.heapUsed / 1024 / 1024)}MB`,
    heapTotal: `${Math.round(usage.heapTotal / 1024 / 1024)}MB`,
    external: `${Math.round(usage.external / 1024 / 1024)}MB`,
    rss: `${Math.round(usage.rss / 1024 / 1024)}MB`,
  });
}

// Monitor memory over time
setInterval(logMemoryUsage, 10000);

// Force garbage collection (development only)
if (global.gc) {
  global.gc();
  logMemoryUsage();
}

Webview memory profiling:

// Use Chrome DevTools Memory tab
// Or programmatically:
if (performance.memory) {
  console.log("Memory:", {
    used: `${Math.round(performance.memory.usedJSHeapSize / 1024 / 1024)}MB`,
    total: `${Math.round(performance.memory.totalJSHeapSize / 1024 / 1024)}MB`,
    limit: `${Math.round(performance.memory.jsHeapSizeLimit / 1024 / 1024)}MB`,
  });
}

Common Issues & Solutions

Build Errors

Issue: "Cannot find module 'electrobun'"

# Solution: Install dependencies
bun install

# Verify electrobun is installed
bun pm ls electrobun

Issue: Native module compilation fails

# macOS: Install Xcode Command Line Tools
xcode-select --install

# Windows: Install Visual Studio Build Tools
# Download from visualstudio.microsoft.com

# Linux: Install build essentials
sudo apt install build-essential

Issue: "WebView2 not found" (Windows)

# Install WebView2 Runtime
# Download from microsoft.com/edge/webview2

Runtime Errors

Issue: Window not showing

// Debug checklist:
// 1. Check window is created
console.log("Window created:", win);

// 2. Explicitly show window
win.show();

// 3. Check window bounds
console.log("Window bounds:", win.getBounds());

// 4. Check if window is minimized/hidden
console.log("Window visible:", win.isVisible());
console.log("Window minimized:", win.isMinimized());

Issue: RPC not working

// Debug checklist:
// 1. Verify RPC handlers defined
console.log("RPC handlers:", Object.keys(handlers));

// 2. Check webview loaded
win.on("did-finish-load", () => {
  console.log("Webview loaded");
});

// 3. Test RPC with try-catch
try {
  const result = await electroview.rpc.testMethod();
  console.log("RPC working:", result);
} catch (error) {
  console.error("RPC error:", error);
}

// 4. Check for CORS issues in webview
// 5. Verify Electroview initialized in webview

Issue: High memory usage

// Common causes:
// 1. Memory leaks from event listeners
window.removeEventListener("resize", handler);

// 2. Large data stored in closures
// Use WeakMap/WeakSet for object references

// 3. Not cleaning up resources
win.on("close", () => {
  // Clean up timers
  clearInterval(intervalId);
  // Close connections
  ws.close();
  // Release resources
  cache.clear();
});

Platform-Specific Issues

macOS:

// Issue: App won't open (Gatekeeper)
// Solution: Code sign and notarize

// Issue: Permissions denied
// Solution: Add Info.plist entries
<key>NSCameraUsageDescription</key>
<string>App needs camera access</string>
<key>NSMicrophoneUsageDescription</key>
<string>App needs microphone access</string>

Windows:

// Issue: SmartScreen warning
// Solution: Code sign with trusted certificate

// Issue: Antivirus blocking
// Solution: Code sign and submit to vendors

Linux:

// Issue: WebKit crashes
// Solution: Install webkit2gtk-4.1
sudo apt install libwebkit2gtk-4.1-dev

// Issue: Missing libraries
// Solution: Check dependencies
ldd dist/MyApp

Debugging Tools

Network Inspection

// Intercept network requests
win.on("will-navigate", (event) => {
  logger.debug("Navigating to:", event.url);
  
  // Block navigation if needed
  if (event.url.includes("blocked.com")) {
    event.preventDefault();
  }
});

// Monitor requests in DevTools Network tab
// Or programmatically:
win.webContents.session.webRequest.onBeforeRequest((details, callback) => {
  logger.debug("Request:", details.url);
  callback({});
});

Source Maps

Ensure source maps are enabled for better debugging:

// tsconfig.json
{
  "compilerOptions": {
    "sourceMap": true,
    "inlineSourceMap": false,
    "inlineSources": true
  }
}

Systematic Debugging Approach

// 1. Reproduce the issue consistently
// 2. Isolate the problem (main vs webview)
// 3. Add logging around suspected code
// 4. Use breakpoints in DevTools/debugger
// 5. Check error messages and stack traces
// 6. Review recent changes (git diff)
// 7. Test in isolation (minimal reproduction)
// 8. Check documentation and examples
// 9. Search issues on GitHub
// 10. Ask on Discord

// Debugging template
async function debugIssue() {
  logger.info("=== Debug Session Started ===");
  logger.info("Environment:", {
    platform: process.platform,
    version: app.getVersion(),
    development: process.env.NODE_ENV === "development",
  });
  
  try {
    logger.info("Step 1: Initialize");
    // ...
    
    logger.info("Step 2: Execute");
    // ...
    
    logger.info("Step 3: Verify");
    // ...
    
    logger.info("=== Debug Session Complete ===");
  } catch (error) {
    logger.error("=== Debug Session Failed ===", error);
    throw error;
  }
}

Resources

For more on Electrobun:

• Core skill: electrobun - Basic setup
• RPC patterns: electrobun-rpc-patterns - RPC debugging
• Distribution: electrobun-distribution - Build issues
• GitHub Issues: https://github.com/blackboardsh/electrobun/issues
• Discord: https://discord.gg/ueKE4tjaCE