Wallaby

What it does

Wallaby runs your JavaScript and TypeScript tests immediately as you type in VS Code, WebStorm and other editors, highlighting results next to your code.

Test run results and coverage update in real time, right next to your code . Tools like time travel debugging and value explorer help you fix issues fast without breaking flow. Basic testing framework extensions are to Wallaby what Notepad is to a modern editor. The tool is insanely fast because it calculates and runs the absolute minimum set of tests affected by your code changes; often only a single test needs to be run. No other testing tool, not even in watch mode, is capable of operating at this level of precision and efficiency. Wallaby Skill and MCP server give AI agents live access to test results, runtime values, execution paths, coverage, and dependencies — letting them deeply…from wallabyjs.com

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