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Visual Studio Code (VSCode) is a cross-platform text and source code editor from Microsoft. It’s one of the most exciting open source projects today, with regular updates from hundreds of contributors. VSCode was among the first tools to support Language Server Protocol (LSP), which has played a large part in providing a great developer experience, in a variety of languages and technologies.
With the previously announcednow shipping in Xcode, it’s a great time to see how this integration works for yourself.
This week, we’ll walk through the process of how to get started with Swift’s new Language Server Protocol support in Visual Studio Code on macOS. If you haven’t tried writing Swift outside Xcode, or are already a VSCode user and new to the language entirely, this article will tell you everything you need to know.
Step 0: Install Xcode
If you don’t already have Xcode installed on your machine, open the Terminal app and run the following command:
Running this command presents a system prompt.
Click the “Get Xcode” button and continue installation on the App Store.
You can verify that everything is working as expected by running the sourcekit-lsp command:
This command launches a new language server process, but don’t worry if it doesn’t provide any feedback to STDOUT — that means it’s working as intended. Exit the process with an ETX signal (^C).
Step 1: Install Visual Studio Code
Download Visual Studio Code and install it to your system Applications folder. Open the app and follow the instructions for launching from the command line. You’ll need to have the code command accessible from $PATH in order to install the SourceKit-LSP extension later on.
Electron apps have a reputation for being big and slow, but don’t let that stop you from giving VSCode a try — its performance and memory footprint are comparable to a native app.
Step 2: Install Node and NPM
VSCode extensions are written in JavaScript / TypeScript. If you’re not already set up for JS development, you can download Node (a JavaScript run-time for outside the browser)
and npm (a package manager for Node) with Homebrew using the following commands or manually by following these instructions:
To verify that you have a working installation, run the following command:
Homebrew Install Vscode
Step 3: Build and Install SourceKit-LSP Extension for Visual Studio Code
From the command line, clone the sourcekit-lsp repository and navigate to Editors/vscode in the resulting directory. Use npm to build the extension and then use the code command to install it:
Now launch (or relaunch) VSCode and open a Swift project, such as this one, and test out Language Server Protocol support for Swift.
To get the full experience of working with Swift from VSCode, we recommend that you also check out the Swift Lint extension (for real-time style and convention diagnostics).
Visual Studio Code Insiders Homebrew
So there you have it — the makings of a first-class Swift development experience outside of Xcode.
Homebrew Vs Code
And with GitHub’s recent announcement of Codespaces, that future may be coming sooner than we once thought. Thanks to Swift’s support for Language Server Protocol, we’ll soon be able to edit Swift code — syntax highlighting, autocompletion, and all — directly from the browser.