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Go in Visual Studio Code

Using the Go extension for Visual Studio Code, you get features like IntelliSense, code navigation, symbol search, testing, debugging, and many more that will help you in Go development.

Go extension banner

You can install the Go extension from the VS Code Marketplace.

Watch "Getting started with VS Code Go" for an explanation of how to build your first Go application using VS Code Go.

This article describes only a subset of the features the Go extension provides. See the extension's documentation for the full, up-to-date list of supported features.

IntelliSense

IntelliSense

IntelliSense features are provided by the Go language server, gopls, maintained by the Go team. You can configure the behavior of gopls using the gopls settings.

Semantic syntax highlighting

For better syntax highlighting than the default TextMate-based syntax highlighting, we recommend enabling semantic highlighting by turning on Gopls' ui.semanticTokens setting.

"gopls": { "ui.semanticTokens": true }

Auto completions

As you type in a Go file, you can see IntelliSense providing you with suggested completions. This even works for members in current, imported, and not yet imported packages. Just type any package name followed by ., and you will get suggestions for the corresponding package members.

Tip: Use ⌃Space (Windows, Linux Ctrl+Space) to trigger the suggestions manually.

Hover information

Hovering on any variable, function, or struct will give you information on that item such as documentation, signature, etc.

Signature help

When you open the ( while calling a function, a pop-up provides signature help for the function. As you keep typing the parameters, the hint (underline) moves to the next parameter.

Tip: Use ⇧⌘Space (Windows, Linux Ctrl+Shift+Space) to manually trigger the signature help when the cursor is inside the () in the function call.

Code navigation

Code Navigation features are available in the context menu in the editor.

  • Go to Definition F12 - Go to the source code of the type definition.
  • Go to Type Definition - Go to the type that defines a symbol.
  • Peek Definition ⌥F12 (Windows Alt+F12, Linux Ctrl+Shift+F10) - Bring up a Peek window with the type definition.
  • Go to References ⇧F12 (Windows, Linux Shift+F12) - Show all references for the type.
  • Show Call Hierarchy ⇧⌥H (Windows, Linux Shift+Alt+H) - Show all calls from or to a function.
  • Go to Implementations ⌘F12 (Windows, Linux Ctrl+F12) - Bring up a Peek window with the list of all implementations of an interface (if triggered with an interface type symbol), or interfaces a type implements (if triggered with a concrete type symbol).
  • Find All Implementations - Show all implementation of an interface (if triggered with an interface type symbol), or interfaces a type implements (if triggered with a concrete type symbol).

You can navigate via symbol search using the Go to Symbol commands from the Command Palette (⇧⌘P (Windows, Linux Ctrl+Shift+P)).

  • Go to Symbol in File - ⇧⌘O (Windows, Linux Ctrl+Shift+O)
  • Go to Symbol in Workspace - ⌘T (Windows, Linux Ctrl+T)

You can also navigate back and forth between a Go file and its test implementation using the Go: Toggle Test File command.

Build and diagnose

The Go language server (gopls) detects build and vet errors found on the workspace. The errors and warnings from running any/all of the above will be shown red/green squiggly lines in the editor. These diagnostics also show up in the Problems panel (View > Problems).

You can add additional lint checks using the go.lintOnSave setting and configuring your choice of linting tool (staticcheck, golangci-lint, or revive) using the go.lintTool setting.

Formatting

You can format your Go file using ⇧⌥F (Windows Shift+Alt+F, Linux Ctrl+Shift+I) or by running the Format Document command from the Command Palette or the context menu in the editor.

By default, formatting is run when you save your Go file. You can disable this behavior by setting editor.formatOnSave to false for the [go] language identifier. You can change this using your JSON setting files.

"[go]": {
        "editor.formatOnSave": false
}

When you have multiple formatters activated for Go files, you can select the Go extension as the default formatter.

"[go]": {
    "editor.defaultFormatter": "golang.go"
}

Formatting is provided by gopls. If you want gofumpt-style formatting, you can configure gopls to use gofumpt.

"gopls": {
    "formatting.gofumpt": true
}

Test

The VS Code Test UI and editor CodeLens elements allow users to easily run tests, benchmarks, profiles for a given function, file, package, or workspace.

Alternatively, the same functionality is available through a set of commands:

There are many test-related commands that you can explore by typing "Go: test" in the Command Palette.

Test Commands

The first three above can be used to generate test skeletons for the functions in the current package, file, or at the cursor using gotests. The last few can be used to run tests in the current package, file, or at the cursor using go test. There is also a command for getting test coverage.

You can configure the extension to run tests and compute test coverage using:

  • go.testOnSave
  • go.coverOnSave
  • go.testFlags

Import packages

The extension organizes imports, and removes unused imports by default. For different behavior, you can override per-language default settings following these instructions.

Run the command Go: Add Import to get a list of packages that can be imported to your Go file. Choose one and it will get added in the import block of your Go file.

Refactoring

Select the area for refactoring (for example variable, function body, etc.). Click on the Code Action light bulb icon that appears in the selected area, or select Refactoring... or Rename Symbol (F2) from the VS Code context menu.

Debugging

The Go extension lets you debug Go code by utilizing the Delve debugger.

Read Debug Go programs in VS Code for setup steps, supported features, configurations, information on remote debugging and a troubleshooting guide. For general debugging features such as inspecting variables, setting breakpoints, and other activities that aren't language-dependent, review VS Code debugging.

Some features unique to Go are:

  • Local & remote debugging
  • Data inspection using Delve's expression syntax
  • Dynamic configuration change and inspection options with dlv command from DEBUG CONSOLE
  • Ability to hide/show system goroutines (use hideSystemGoroutines configuration)
  • Disassembly view support (right-click your source code and select Open Disassembly View)
  • Experimental function call, core inspection, Mozilla rr support

Next steps

This has been a brief overview showing the Go extension features within VS Code. For more information, see the details provided in the Go extension README.

To stay up to date on the latest features/bug fixes for the Go extension, see the CHANGELOG.

If you have any issues or feature requests, feel free to log them in the Go extension vscode-go repo.

If you'd like to learn more about VS Code, try these topics:

12/11/2024