What's New

In addition to this page, you may also follow us on twitter (@WallabyJs) to be notified whenever we release notable features.

Note

The content of this page is adjusted based on your editor of choice. Your editor selection can be changed using the dropdown in the top right corner of the page.

Most Recent Major Features and Changes

The What’s New section includes major features and changes that have been made in the last 12-18 months. For older news or more details about minor updates and changes, please refer to our changelog.

Copilot Agent tools and MCP support (Apr 17 2025)

Agentic AI workflows are transforming how developers interact with code, with context playing a crucial role. Wallaby’s new AI tools and MCP server provide rich insights—such as runtime values, execution paths, and coverage data—to enhance agent capabilities. Now Wallaby enables Copilot Chat, Cursor, Windsurf, Cline, and other agents to access detailed runtime context on demand. Read more in our blog.

Support for Vitest v3.1.x+ (Apr 01 2025)

Wallaby now supports the latest version of vitest (v3.1.x+). The recent update of vitest included breaking changes that required updates to Wallaby's vitest integration.

Copilot Chat Integration (Feb 18 2025)

The best AI model for investigating unit test errors is the one with the most context — provided by the user and the right tools. Wallaby now automatically provides GitHub Copilot with detailed context and tools - including execution paths, test coverage, and runtime values - to debug smarter. Read more in our blog.

Keyboard Shortcuts (Feb 12 2025)

Wallaby UI now offers quick access to keyboard shortcuts documentation in the Overview and Side view panels, both inside the editor and from the browser (when using Linked or Standalone Mode). Press the ? key while focused on either panel, or click the keyboard icon on the right side of the Overview panel, to display a comprehensive list of available shortcuts.

Support for Vitest v3.0.x+ (Jan 23 2025)

Wallaby now supports the latest version of vitest (v3.0.x+). The recent update of vitest included breaking changes that required updates to Wallaby's vitest integration.

Value Peek (Jan 21 2025)

Wallaby for VS Code and JetBrains editors now supports Value Peek, a way to quickly see any value just by hovering over it. Wallaby will handle execution of the relevant tests to provide values, which will be displayed in the hover. To keep your editor clutter-free, values shown this way will not appear next to your code by default (but can be made to appear using the "Explore Value" action available in the hover). Value Peek can be toggled on or off to fit with your workflow.

Previous major features and changes

Our what’s new archive contains the full history of our major features and changes (starting February 2020).

Full Change Log

Our changelog is available in our public repository. Please note that while we update our changelog every few months, we release new versions of Wallaby.js a few times a week (sometimes a few times a day).

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