# Build Instructions (Windows)

Follow the guidelines below for building Electron on Windows.

## Prerequisites

• Windows 10 / Server 2012 R2 or higher
• See the Chromium build documentation for more details on which Visual Studio components are required.
• If your Visual Studio is installed in a directory other than the default, you'll need to set a few environment variables to point the toolchains to your installation path.
• vs2019_install = DRIVE:\path\to\Microsoft Visual Studio\2019\Community, replacing 2019 and Community with your installed versions and replacing DRIVE: with the drive that Visual Studio is on. Often, this will be C:.
• WINDOWSSDKDIR = DRIVE:\path\to\Windows Kits\10, replacing DRIVE: with the drive that Windows Kits is on. Often, this will be C:.
• Python 2.7.10 or higher
• Contrary to the depot_tools setup instructions linked below, you will need to use your locally installed Python with at least version 2.7.10 (with support for TLS 1.2). To do so, make sure that in PATH, your locally installed Python comes before the depot_tools folder. Right now depot_tools still comes with Python 2.7.6, which will cause the gclient command to fail (see https://crbug.com/868864).
• Python for Windows (pywin32) Extensions is also needed in order to run the build process.
• Node.js
• Git
• Debugging Tools for Windows of Windows SDK 10.0.15063.468 if you plan on creating a full distribution since symstore.exe is used for creating a symbol store from .pdb files.
• Different versions of the SDK can be installed side by side. To install the SDK, open Visual Studio Installer, select ChangeIndividual Components, scroll down and select the appropriate Windows SDK to install. Another option would be to look at the Windows SDK and emulator archive and download the standalone version of the SDK respectively.
• The SDK Debugging Tools must also be installed. If the Windows 10 SDK was installed via the Visual Studio installer, then they can be installed by going to: Control PanelProgramsPrograms and Features → Select the "Windows Software Development Kit" → ChangeChange → Check "Debugging Tools For Windows" → Change. Or, you can download the standalone SDK installer and use it to install the Debugging Tools.

If you don't currently have a Windows installation, dev.microsoftedge.com has timebombed versions of Windows that you can use to build Electron.

Building Electron is done entirely with command-line scripts and cannot be done with Visual Studio. You can develop Electron with any editor but support for building with Visual Studio will come in the future.

Note: Even though Visual Studio is not used for building, it's still required because we need the build toolchains it provides.

## 32bit Build

To build for the 32bit target, you need to pass target_cpu = "x86" as a GN arg. You can build the 32bit target alongside the 64bit target by using a different output directory for GN, e.g. out/Release-x86, with different arguments.

$gn gen out/Release-x86 --args="import(\"//electron/build/args/release.gn\") target_cpu=\"x86\""  The other building steps are exactly the same. ## Visual Studio project To generate a Visual Studio project, you can pass the --ide=vs2017 parameter to gn gen: $ gn gen out/Testing --ide=vs2017


## Troubleshooting

If you encountered an error like Command xxxx not found, you may try to use the VS2015 Command Prompt console to execute the build scripts.

### Fatal internal compiler error: C1001

Make sure you have the latest Visual Studio update installed.

### LNK1181: cannot open input file 'kernel32.lib'

Try reinstalling 32bit Node.js.

Creating that directory should fix the problem:

$mkdir ~\AppData\Roaming\npm  ### node-gyp is not recognized as an internal or external command You may get this error if you are using Git Bash for building, you should use PowerShell or VS2015 Command Prompt instead. ### cannot create directory at '...': Filename too long node.js has some extremely long pathnames, and by default git on windows doesn't handle long pathnames correctly (even though windows supports them). This should fix it: $ git config --system core.longpaths true


### error: use of undeclared identifier 'DefaultDelegateCheckMode'

This can happen during build, when Debugging Tools for Windows has been installed with Windows Driver Kit. Uninstall Windows Driver Kit and install Debugging Tools with steps described above.

### ImportError: No module named win32file

Make sure you have installed pywin32 with pip install pywin32.

### Build Scripts Hang Until Keypress

This bug is a "feature" of Windows' command prompt. It happens when clicking inside the prompt window with QuickEdit enabled and is intended to allow selecting and copying output text easily. Since each accidental click will pause the build process, you might want to disable this feature in the command prompt properties.

## Keyboard Shortcuts

Key Action
/ Focus the search bar
Esc Focus the search bar and cleans it
Select the next search result
Select the previous search result
Enter Open the selected search result
cmdEnter Ctrl+Enter Open the selected search result in a new tab