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# Contributing
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- [Pull Requests ](#pull-requests )
- [Requirements ](#requirements )
- [Development Workflow ](#development-workflow )
- [Build ](#build )
- [Structure ](#structure )
- [Modifications to VS Code ](#modifications-to-vs-code )
- [Currently Known Issues ](#currently-known-issues )
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- [Detailed CI and build process docs ](../ci )
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## Pull Requests
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Please create a [GitHub Issue ](https://github.com/cdr/code-server/issues ) for each issue
you'd like to address unless the proposed fix is minor.
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In your Pull Requests (PR), link to the issue that the PR solves.
Please ensure that the base of your PR is the **master** branch. (Note: The default
GitHub branch is the latest release branch, though you should point all of your changes to be merged into
master).
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## Requirements
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The prerequisites for contributing to code-server are almost the same as those for
[VS Code ](https://github.com/Microsoft/vscode/wiki/How-to-Contribute#prerequisites ).
There are several differences, however. You must:
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- Use Node.js version 12.x (or greater)
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- Have [yarn ](https://classic.yarnpkg.com/en/ ) installed (which is used to install JS packages and run development scripts)
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- Have [nfpm ](https://github.com/goreleaser/nfpm ) (which is used to build `.deb` and `.rpm` packages and [jq ](https://stedolan.github.io/jq/ ) (used to build code-server releases) installed
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The [CI container ](../ci/images/debian8/Dockerfile ) is a useful reference for all
of the dependencies code-server uses.
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## Development Workflow
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```shell
yarn
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yarn watch
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# Visit http://localhost:8080 once the build is completed.
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```
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To develop inside an isolated Docker container:
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```shell
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./ci/dev/image/run.sh yarn
./ci/dev/image/run.sh yarn watch
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```
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`yarn watch` will live reload changes to the source.
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## Build
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You can build using:
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```shell
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./ci/dev/image/run.sh ./ci/steps/release.sh
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```
Run your build with:
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```shell
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cd release
yarn --production
# Runs the built JavaScript with Node.
node .
```
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Build the release packages (make sure that you run `./ci/steps/release.sh` first):
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```shell
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IMAGE=centos7 ./ci/dev/image/run.sh ./ci/steps/release-packages.sh
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# The standalone release is in ./release-standalone
# .deb, .rpm and the standalone archive are in ./release-packages
```
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The `release.sh` script is equal to running:
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```shell
yarn
yarn build
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yarn build:vscode
yarn release
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```
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And `release-packages.sh` is equal to:
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```shell
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yarn release:standalone
yarn test:standalone-release
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yarn package
```
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For a faster release build, you can run instead:
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```shell
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KEEP_MODULES=1 ./ci/steps/release.sh
node ./release
```
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## Structure
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The `code-server` script serves an HTTP API for login and starting a remote VS Code process.
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The CLI code is in [./src/node ](./src/node ) and the HTTP routes are implemented in
[./src/node/app ](./src/node/app ).
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Most of the meaty parts are in the VS Code portion of the codebase under [./lib/vscode ](./lib/vscode ), which we described next.
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### Modifications to VS Code
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In v1 of code-server, we had a patch of VS Code that split the codebase into a front-end
and a server. The front-end consisted of all UI code, while the server ran the extensions
and exposed an API to the front-end for file access and all UI needs.
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Over time, Microsoft added support to VS Code to run it on the web. They have made
the front-end open source, but not the server. As such, code-server v2 (and later) uses
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the VS Code front-end and implements the server. We do this by using a git subtree to fork and modify VS Code. This code lives under [./lib/vscode ](./lib/vscode ).
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Some noteworthy changes in our version of VS Code:
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- Adding our build file, which includes our code and VS Code's web code
- Allowing multiple extension directories (both user and built-in)
- Modifying the loader, websocket, webview, service worker, and asset requests to
use the URL of the page as a base (and TLS, if necessary for the websocket)
- Sending client-side telemetry through the server
- Allowing modification of the display language
- Making it possible for us to load code on the client
- Making extensions work in the browser
- Making it possible to install extensions of any kind
- Fixing issue with getting disconnected when your machine sleeps or hibernates
- Adding connection type to web socket query parameters
As the web portion of VS Code matures, we'll be able to shrink and possibly
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eliminate our modifications. In the meantime, upgrading the VS Code version requires
us to ensure that our changes are still applied and work as intended. In the future,
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we'd like to run VS Code unit tests against our builds to ensure that features
work as expected.
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**Note**: We have [extension docs ](../ci/README.md ) on the CI and build system.
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If the functionality you're working on does NOT depend on code from VS Code, please
move it out and into code-server.
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### Currently Known Issues
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- Creating custom VS Code extensions and debugging them doesn't work
- Extension profiling and tips are currently disabled