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Dafny for Visual Studio Code

This extension supports Dafny version 3 and beyond. If you require Dafny 2 support, consider using the legacy extension.

Features

  • Compile and Run .dfy files.
  • Verification as one types.
  • Syntax highlighting thanks to sublime-dafny. See file LICENSE_sublime-dafny.rst for license.
  • Display counterexample for failing proof.
  • IntelliSense to suggest symbols.
  • Go to definition to quickly navigate.
  • Hover Information for symbols.

You can find examples below.

Shortcuts

Shortcut Description
Ctrl+Shift+B or ⇧+⌘+B Compile to .dll or, if there is a Main method, to .exe file
F5 Compile and run, if the source file has a Main method
F6 Compile with custom arguments
F7 Show Counterexample
F8 Hide Counterexample

Requirements

The plugin requires at least .NET Core 5.0 (the ASP.NET Core 5.0 or 6.0 runtimes to be more specific) to run the Dafny Language Server. Please download a distribution from Microsoft. When you first open a Dafny file, the extension will prompt you to install .NET Core manually. The language server gets installed automatically.

Examples

Here are a few impressions of the features.

Installation

On the first start, the plugin will install the Dafny language server automatically.

Installation

Error Highlighting

Syntax

Whenever a syntax, semantic, or verification error is present, the plugin will inform the user.

Compile and Run

Press F5 to compile and run the program.

Compile

Show Counterxamples

Press F7 to show counterexamples.

Counter

Hover Information

Hover a symbol to get information about that symbol.

Hover

IntelliSense

Type a dot to get a list of possible members of the accessed symbol.

IntelliSense

Automatic Verification

If VSCode appears unresponsive, you may lower the verification frequency or disable it entirely.

Automatic Verification

Troubleshooting

Stuck at Verifying...

Under certain circumstances, the extension appears to be stuck at Verifying.... Until now, this has only been observed for Mac OSX and occurs due to a stack overflow in the language server. To overcome this issue, set the environment variable COMPlus_DefaultStackSize to a sufficiently large value before starting VSCode. For example:

# Increase the stack size
export COMPlus_DefaultStackSize=100000

# Launch VSCode
code

Contribute

Dafny for Visual Studio Code is an MIT licensed open-source project that lives from code contributions.

We welcome your help! For a description of how you can contribute, as well as a list of issues you can work on, please visit the Dafny-VSCode GitHub repository.

Building Locally

To build Dafny VSCode locally, first clone this repository.

git clone https://github.com/dafny-lang/ide-vscode.git

Change into the root directory of the previously cloned repository and install the node modules.

npm install

To build and debug using Visual Studio Code, install the TypeScript + Webpack Problem Matchers extension. After the installation, open the root folder within VSCode and hit F5 to debug the Dafny extension.

Because the latest version of the plugin requires recent changes to the Dafny language server, you will then need to change the dafny.compilerRuntimePath and dafny.languageServerRuntimePath extension settings to point to the Dafny.dll and DafnyLanguageServer.dll files from a local build of Dafny. See here for instructions on building Dafny locally.

Packaging

To create a VSIX package of the previously built sources, create the package through the CLI:

npx vsce package

Coding Conventions

We use ESLint with the TypeScript plugin to ensure code consistency across the whole source. Install the ESLint extension in VSCode to have live feedback. Alternatively, you can check your code from the command line by running npm run lint.