Cross-platform environment var helper

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

Verification, sanitization, and type coercion for environment variables in Node.js

Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.

Determine if the JS environment has `Symbol.toStringTag` support. Supports spec, or shams.

Determine if the JS environment has Symbol support. Supports spec, or shams.

ES6 spec-compliant RegExp.prototype.flags shim.

An ES2015 spec-compliant `Function.prototype.name` shim

ES spec-compliant shim for ArrayBuffer.prototype.slice

string-argv parses a string into an argument array to mimic process.argv. This is useful when testing Command Line Utilities that you want to pass arguments to.

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

Wrap all spawned Node.js child processes by adding environs and arguments ahead of the main JavaScript file argument.

Fast Javascript text diff

Module for reading .pgpass

Define a data property on an object. Will fall back to assignment in an engine without descriptors.

ES2017 spec-compliant Object.values shim.

ES2019 spec-compliant String.prototype.trimStart shim.

ES2017 spec-compliant Object.entries shim.

A module which will endeavor to guess your terminal's level of color support.

An ESnext spec-compliant `Array.prototype.toSorted` shim/polyfill/replacement that works as far down as ES3.