Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc

Run scripts that set and use environment variables across platforms

Check if the process is running in a Continuous Integration (CI) environment

Get the PATH environment variable key cross-platform

Offers getProxyForUrl to get the proxy URL for a URL, respecting the *_PROXY (e.g. HTTP_PROXY) and NO_PROXY environment variables.

Environment utilities

Environment with unlimited test event handlers

Easily expose environment variables in Vite.js

Check if the process is running in an SSH session

Helper visitor to only visit nodes in the current 'this' context

Detect if code is running in an AI agent or automated development environment

Loads environment variables from .env file

Validation for your environment variables

Puppeteer environment for Jest.

Use Happy DOM as environment in Jest.

Check the engines and platform fields in package.json

A superset of the JSDOM environment for Jest that respects Node.js globals.

Get and typecast environment variables.

Use env() variables in CSS

Executes a command using the environment variables in an env file