Jest Environment Emitter

jest-environment-emit is a utility package for Jest that overcomes the limitation of having only one test environment per project. It provides a mechanism to add multiple event handlers to any Jest test environment, acting similarly to multiple test reporters. The package offers `WithEmitter`, a higher-order function to wrap custom environments, and pre-wrapped `TestEnvironment` classes for `jest-environment-node` and `jest-environment-jsdom` via subpath exports. Currently at version 1.2.0, released in June 2025, the package maintains a steady release cadence, frequently addressing compatibility with new Jest versions (e.g., Jest 30 support in v1.2.0) and refining import/export mechanisms for robust ESM and CJS interoperability. Its primary differentiator is enabling modular, composable event-driven logic within the Jest testing lifecycle, which is otherwise restricted to a single environment definition. It ships with full TypeScript types, enhancing developer experience.