Prool

Prool is a TypeScript-first library designed to provide programmatic HTTP testing instances for various Ethereum components. It enables developers to spin up local execution nodes (like Anvil and Tempo) and ERC-4337 bundler nodes (like Alto) within testing environments such as Vitest. The library is currently at version `0.2.4` and maintains an active release cadence with frequent patch and minor updates. A key differentiator is its focus on streamlining the setup and teardown of these instances for reliable, isolated tests, abstracting away the complexities of managing external processes or Docker containers. Users can utilize pre-configured instances or define custom ones to suit specific testing needs, requiring Node.js >=22. It integrates with `testcontainers` for containerized instances.