jest-runner-prettier

A Jest runner that formats files using Prettier. Current stable version is 1.0.0, released February 2022. It integrates Prettier into Jest as a custom runner, allowing you to check formatting as part of your test suite. Requires Jest >= 27.0.0 and Prettier >= 1.8. Ships TypeScript definitions. Key differentiator: provides a built-in Jest preset for easy configuration, supports all file types Prettier handles, and produces diff output on formatting failures. Suitable for CI pipelines to enforce consistent code style.