Node-TAP Test Framework

TAP (Test-Anything-Protocol) is a robust and opinionated test framework for Node.js, currently in version 21.7.1. It provides a comprehensive command-line test runner and a JavaScript/TypeScript framework for writing tests that output in the TAP format. A key differentiator is its philosophy of treating test files as "normal" programs, running each test in its own process to prevent state leakage and inter-test dependencies. Since version 18, `tap` has been entirely rewritten in TypeScript, offering first-class support for ESM, CommonJS, and TypeScript out-of-the-box, including rich, machine-generated type definitions for an enhanced developer experience with editor auto-completion. It features built-in test coverage (powered by `c8`), various reporter formats, and an extensive API leveraging a plugin-based architecture for core functionalities like assertions and mocking. The project maintains an active release cadence with frequent updates.