babel-jest

Jest plugin to use Babel for transformation of source files during testing. Current stable version is 30.3.0 (released 2025). It is part of the Jest monorepo and follows Jest's release cadence. Key differentiators: integrates tightly with Jest's transform pipeline, automatically picks up Babel configuration, supports custom transformers and presets, and is ESM-compatible. It is the recommended way to transpile modern JavaScript and TypeScript code in Jest tests when using Babel. Compared to alternative transformers like ts-jest, babel-jest is faster but does not perform type checking.