jedwatson/exenv

Exenv is a utility package that provides React's ExecutionEnvironment module for detecting available browser features like the DOM, Web Workers, and event listeners. It's designed for developers who need to check environmental capabilities in their JavaScript packages, particularly when building components that need to work across different contexts like server-side rendering or browser environments. The package serves as a safe alternative to directly accessing React's internal ExecutionEnvironment, preventing potential breaking changes when React updates its internal APIs.