Blazingly Fast Tests run immediately as you type, on unsaved changes, in parallel if required; no need to do anything manually. Wallaby knows how your code and tests relate, so after a change only the minimum set of tests need to re-run; no other tool is capable of operating like this. No matter how large your project grows, feedback is almost instant.

Time Travel DebuggingNEW Move forward and backwards through your code to understand the conditions that led to a specific bug. Wallaby's Time Travel Debugger accelerates your edit, compile and debug loop by allowing you to jump to a specific line of code, view runtime values, edit-and-continue and step into, over and out of your code.

Test StoriesNEW Inspect the code that your test is executing in a single logical view. Wallaby's Test Story Viewer allows you to see your test execution trace without having to jump between multiple functions or code files. It is ideal for both reading and debugging code. Quickly see covered lines of code, step into, over and out of your code, and view runtime values.

Inline Runtime Values See the results of console.log and runtime variables in your editor, right next to your code. Show and copy expression values with editor commands, accessible using keyboard shortcuts. Wallaby's special comment format can also be used to evaluate expressions and includes the ability to measure code execution times.

Inline Error Reporting Error messages are displayed right next to the code that caused them. Gutter indicators show if the current line of code is the source of an error, or if it's on the execution path of a failing test or error. Editor commands (with keyboard shortcuts) allow you to quickly navigate to the associated failing test or error source.

Inline Code Coverage Indicators in the gutter of your code editor are constantly updated in realtime to display test coverage so you can quickly see which lines of code are fully covered, only partially covered or not covered at all. Editor commands can be used to toggle uncovered regions to see exactly which parts of your code have not been executed.

Test and Coverage Explorer A strategic-level view of your project's tests and code coverage is available through Wallaby's locally hosted web application. Open files in your editor from your browser as you explore your tests and code-coverage. Sort and filter by name, duration, passing / failing tests, and code coverage. You can also exclude code from coverage calculations.

Interactive Tests Output Test execution results are ergonomically displayed in your editor's output window. All tests that are currently failing are listed, along with errors, diffs/snapshots, error stacks and any console.log calls. The output window's hyperlinks allow you to navigate directly to files in your editor, for example to the exact error line, or to a broken test.

Runtime Value Explorer Wallaby's Value Explorer allows non-primitive runtime values to be viewed and explored in an easy-to-navigate real-time treeview. This feature is great for exploring larger objects and makes debugging with Wallaby easier and faster. The tree can be expanded to any depth and paths / values can be copied directly to the clipboard.