Electron is framework that lets you run cross-platform web apps on desktop. Visual Studio Code is one those cross-platform apps that is written with Electron. To create simple Electron application all you need is three files: package.json, main.js and index.html for this example I used this sample application

After all project files are created open debug panel and click configure button which will create settings launch.json file with debug configuration.

image

 

We will need only configuration with name “Attach”.

{
    "version": "0.1.0",
    // List of configurations. Add new configurations or edit existing ones.  
    // ONLY "node" and "mono" are supported, change "type" to switch.
    "configurations": [
        {
            "name": "Attach",
            "type": "node",
            // TCP/IP address. Default is "localhost".
            "address": "localhost",
            // Port to attach to.
            "port": 5858
        }
    ]
}

Start Electron application with debugging enabled:

electron --debug=5858 hello-world/

In debug panel choose “Attach” configuration and press “Start” or F5.

image

After few seconds if everything went successfully you should see debug commands:

image

 

Try setting breakpoint in application close event:

image

 

And close application to test break point:

image

Note that you can debug only nodes back end JavaScript code, client side script debugging is not supported.

Source Code

First of all, lets create simple application to debug. Set a break point and start application.
using System;

namespace ConsoleApplication
{
    class Program
    {
        static void Main()
        {
            var a = 3;
            var b = 2;
            var result = a + b;
            Console.WriteLine("Result: {0}", result);
        }
    }
}

When break point is hit, open Debug > Windows > Disassembly. A new window will open with C# mixed with assembly and with break point. You can use Step Over and Step Out to move between assembly instructions.
--- c:\Users\s\Documents\Visual Studio 2013\Projects\ConsoleApplication\ConsoleApplication\Program.cs 
     8:         {
00B22E9A  in          al,dx  
00B22E9B  push        edi  
00B22E9C  push        esi  
00B22E9D  push        ebx  
00B22E9E  sub         esp,44h  
00B22EA1  lea         edi,[ebp-50h]  
00B22EA4  mov         ecx,11h  
00B22EA9  xor         eax,eax  
00B22EAB  rep stos    dword ptr es:[edi]  
00B22EAD  cmp         dword ptr ds:[0A4C504h],0  
00B22EB4  je          00B22EBB  
00B22EB6  call        727D38A2  
00B22EBB  xor         edx,edx  
00B22EBD  mov         dword ptr [ebp-44h],edx  
00B22EC0  xor         edx,edx  
00B22EC2  mov         dword ptr [ebp-40h],edx  
00B22EC5  xor         edx,edx  
00B22EC7  mov         dword ptr [ebp-3Ch],edx  
00B22ECA  nop  
     9:             var a = 3;
00B22ECB  mov         dword ptr [ebp-3Ch],3  
    10:             var b = 2;
00B22ED2  mov         dword ptr [ebp-40h],2  
    11:             var result = a + b;
00B22ED9  mov         eax,dword ptr [ebp-3Ch]  
00B22EDC  add         eax,dword ptr [ebp-40h]  
00B22EDF  mov         dword ptr [ebp-44h],eax  
    12:             Console.WriteLine("Result: {0}", result);
00B22EE2  mov         ecx,5BC6FE38h  
00B22EE7  call        00A330F4  
00B22EEC  mov         dword ptr [ebp-48h],eax  
00B22EEF  mov         eax,dword ptr ds:[34F21CCh]  
00B22EF5  mov         dword ptr [ebp-4Ch],eax  
00B22EF8  mov         eax,dword ptr [ebp-48h]  
00B22EFB  mov         edx,dword ptr [ebp-44h]  
00B22EFE  mov         dword ptr [eax+4],edx  
00B22F01  mov         eax,dword ptr [ebp-48h]  
00B22F04  mov         dword ptr [ebp-50h],eax  
00B22F07  mov         ecx,dword ptr [ebp-4Ch]  
00B22F0A  mov         edx,dword ptr [ebp-50h]  
00B22F0D  call        5BBEC704  
00B22F12  nop  
    13:         }
00B22F13  nop  
00B22F14  lea         esp,[ebp-0Ch]  
00B22F17  pop         ebx  
00B22F18  pop         esi  
00B22F19  pop         edi  
00B22F1A  pop         ebp  
00B22F1B  ret  
--- No source file -------------------------------------------------------------
Some comments on marked lines.

Variable initialization, with default values:
  • 16 - result
  • 18 - b
  • 20 - a
Initial values:
  • 23 - set value to a
  • 25 - set value to b
Perform a and b addition:
  • 27 - load b
  • 28 - add a to previously loaded value
  • 29 - store output to result variable
Console.WriteLine execution:
  • 34 - load "Result :{0}" string from 34F21CCh address to ebp-48h registry
  • 36 - load "Result :{0}" string from ebp-48h
  • 37 - load result variable
  • 43 - invoke Console.WriteLine function, and pass all loaded variables
And that's where my assembly knowledge ends :)