How to Contribute

Daniel Imms edited this page Dec 24, 2018 · 140 revisions

Contributing to Code

There are many ways to contribute to the Code project: logging bugs, submitting pull requests, reporting issues, and creating suggestions.

After cloning and building the repo, check out the issues list. Issues labeled good first issue are good candidates to pick up if you are in the code for the first time. If you are contributing significant changes, please discuss with the assignee of the issue first before starting to work on the issue.

Build and Run

If you want to understand how Code works or want to debug an issue, you'll want to get the source, build it, and run the tool locally.

Getting the sources

git clone


  • Git
  • Node.JS, 64-bit, >= 8.12.0, < 9.0.0
  • Yarn, follow the installation guide
  • Python, at least version 2.7 (version 3 is not supported)
  • C/C++ compiler tool chain
    • Windows
      • Set a PYTHON environment variable pointing to your python.exe. E.g.: C:\Python27\python.exe
      • Install a compiler for the native modules VSCode is depending on
        • Option 1 (recommended): Use Windows Build Tools npm module
          • Start Powershell as Administrator and install Windows Build Tools npm module (documentation).

             npm install --global windows-build-tools --vs2015

            Note: The --debug flag is helpful if you encounter any problems during installation.

            Note: if you encounter an error The build tools for v141 (Platform Toolset = 'v141') cannot be found." you might have a version of Visual Studio installed. Either uninstall that version or make sure to have VC++ 2015.3 v14.00 (v140) toolset for desktop installed (see below)

        • Option 2: Use Visual Studio 2017
          • Install Visual Studio 2017 Community Edition

          • Select Desktop Development with C++

          • Select VC++ 2015.3 v14.00 (v140) toolset for desktop on the right hand side

            Note: if you encounter an error The build tools for v141 (Platform Toolset = 'v141') cannot be found." make sure you installed the VC++ 2015.3 v14.00 (v140) toolset for desktop from the previous step

      • Restart your computer
      • Warning: Make sure your profile path only contains ASCII letters, e.g. John, otherwise it can lead to node-gyp usage problems (nodejs/node-gyp/issues#297)
      • Note: Building and debugging via the Windows subsystem for Linux (WSL) is currently not supported.
    • macOS
      • Xcode and the Command Line Tools (Xcode -> Preferences -> Downloads), which will install gcc and the related toolchain containing make
    • Linux
      • make
      • GCC or another compile toolchain
      • native-keymap needs libx11-dev and libxkbfile-dev.
        • On Debian-based Linux: sudo apt-get install libx11-dev libxkbfile-dev
        • On Red Hat-based Linux: sudo yum install libX11-devel.x86_64 libxkbfile-devel.x86_64 # or .i686.
      • keytar needs libsecret-1-dev.
        • On Debian-based Linux: sudo apt-get install libsecret-1-dev.
        • On Red Hat-based Linux: sudo yum install libsecret-devel.
      • Building deb and rpm packages requires fakeroot and rpm, run: sudo apt-get install fakeroot rpm

Finally, install all dependencies using Yarn:

cd vscode

If you are on Windows or Linux 64 bit systems and would like to compile to 32 bits, you'll need to set the npm_config_arch environment variable to ia32 before running yarn. This will compile all native node modules for a 32 bit architecture. Similarly, when cross-compiling for ARM, set npm_config_arch to arm.

Note: For more information on how to install NPM modules globally on UNIX systems without resorting to sudo, refer to this guide.


From a terminal, where you have cloned the vscode repository, execute the following command to run the TypeScript incremental builder:

yarn watch

The incremental builder will do an initial full build and will display a message that includes the phrase "Finished compilation" once the initial build is complete. The builder will then continue to run in the terminal. It will watch for file changes and compile those changes incrementally, giving you a fast, iterative coding experience.

👉 Tip! Linux users may hit a ENOSPC error when running yarn run watch, to get around this follow instructions in the Common Questions.

👉 Tip! Open VS Code on the folder where you have cloned the vscode repository and press CMD+SHIFT+B (CTRL+SHIFT+B on Windows, Linux) to start the builder. To view the build output open the Output stream by pressing CMD+SHIFT+U.

Errors and Warnings

Errors and warnings will show in the console while developing Code. If you use VS Code to develop Code, errors and warnings are shown in the status bar at the bottom left of the editor. You can view the error list using View | Errors and Warnings or pressing CMD+P and then !.

👉 Tip! You don't need to stop and restart the development version of Code after each change. You can just execute Reload Window from the command palette. We like to assign the keyboard shortcut CMD+R (CTRL+R on Windows, Linux) to this command.


To test the changes you launch a development version of VS Code on the workspace vscode, which you are currently editing.

macOS and Linux




You can identify the development version of Code ("Code - OSS") by the following icon in the Dock or Taskbar:

VS Code default icon

👉 Tip! If you receive an error stating that the app is not a valid Electron app, it probably means you didn't run yarn run watch first.


Code has a multi-process architecture and your code is executed in different processes.

The render process runs the UI code inside the Shell window. To debug code running in the render you can either use VS Code or the Chrome Developer Tools.

Using VSCode

  • Install the Debugger for Chrome extension. This extension will let you attach to and debug client side code running in Chrome.
  • Open the vscode repository folder
  • Choose the Launch VS Code launch configuration from the launch dropdown in the Debug viewlet and press F5.

Using the Chrome Developer Tools

  • Run the Developer: Toggle Developer Tools command from the Command Palette in your development instance of Code to launch the Chrome tools.
  • It's also possible to debug the released versions of Code, since the sources link to sourcemaps hosted online.


The extension host process runs code implemented by a plugin. To debug extensions (including those packaged with Code) which run in the extension host process, you can use VS Code itself. Switch to the Debug viewlet, choose the Attach to Extension Host configuration, and press F5.

The search process can be debugged, but must first be started. Before attempting to attach, start a search by pressing CMD+P (CTRL+P on Windows), otherwise attaching will fail and time out.

Automated Testing

Run the unit tests directly from a terminal by running ./scripts/ from the vscode folder (scripts\test on Windows). The test README has complete details on how to run and debug tests, as well as how to produce coverage reports.

We also have automated UI tests. The smoke test README has all the details.


We use tslint for linting our sources. You can run tslint across the sources by calling gulp tslint from a terminal or command prompt. You can also run gulp tslint as a Code task by pressing CMD+P (CTRL+P on Windows) and entering task tslint. Warnings from tslint show up in the Errors and Warnings quick box and you can navigate to them from inside Code.

To lint the source as you make changes you can install the tslint extension.

Work Branches

Even if you have push rights on the Microsoft/vscode repository, you should create a personal fork and create feature branches there when you need them. This keeps the main repository clean and your personal workflow cruft out of sight.

Pull Requests

Before we can accept a pull request from you, you'll need to sign a Contributor License Agreement (CLA). It is an automated process and you only need to do it once.

To enable us to quickly review and accept your pull requests, always create one pull request per issue and link the issue in the pull request. Never merge multiple requests in one unless they have the same root cause. Be sure to follow our Coding Guidelines and keep code changes as small as possible. Avoid pure formatting changes to code that has not been modified otherwise. Pull requests should contain tests whenever possible.

Where to Contribute

Check out the full issues list for a list of all potential areas for contributions. Note that just because an issue exists in the repository does not mean we will accept a contribution to the core editor for it. There are several reasons we may not accept a pull request like:

  • Performance - One of Visual Studio Code's core values is to deliver a lightweight code editor, that means it should perform well in both real and perceived performance.
  • User experience - Since we want to deliver a lightweight code editor, the UX should feel lightweight as well and not be cluttered. Most changes to the UI should go through the issue owner and/or the UX team.
  • Architectural - The team and/or feature owner needs to agree with any architectural impact a change may make. Things like new extension APIs must be discussed with and agreed upon by the feature owner.

To improve the chances to get a pull request merged you should select an issue that is labelled with the help-wanted or bug labels. If the issue you want to work on is not labelled with help-wanted or bug, you can start a conversation with the issue owner asking whether an external contribution will be considered.

To avoid multiple pull requests resolving the same issue, let others know you are working on it by saying so in a comment.


Code can be packaged for the following platforms: win32-ia32 | win32-x64 | darwin | linux-ia32 | linux-x64 | linux-arm

These gulp tasks are available:

  • vscode-[platform]: Builds a packaged version for [platform].
  • vscode-[platform]-min: Builds a packaged and minified version for [platform].

See also: Cross-Compiling for Debian-based Linux


We're also interested in your feedback for the future of Code. You can submit a suggestion or feature request through the issue tracker. To make this process more effective, we're asking that these include more information to help define them more clearly.


We appreciate your localization contributions, either by providing new translations, voting on translations, or suggesting process improvements. We take translations through the Transifex service, not through the vscode repo. See our localization site to get started.

Discussion Etiquette

In order to keep the conversation clear and transparent, please limit discussion to English and keep things on topic with the issue. Be considerate to others and try to be courteous and professional at all times.

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