check for the existence of deeply nested objects

Deep check if an identifier is defined and not null

Deep check if property exists

deep check for equality

Run deep-check and throw and Error for missing properties

type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

Deep Check to compare contents of Objects as opposed to just Identity Checking. Feature add to JavaScript.

Large collection of predicates.

Improved deep equality testing for Node.js and the browser.

Custom errors

Minimalistic update notifications for command line interfaces

get colors in your node.js console

Light ECMAScript (JavaScript) Value Notation - human written, concise, typed, flexible

Framework-agnostic, micro-library for getting stack traces in all environments

Check if a binary is working

Check if a stream has ended

Compile ES2015 constants to ES5

HTTP response freshness testing

Fastest deep equal comparison for React. Great for React.memo & shouldComponentUpdate. Also really fast general-purpose deep comparison.

check if a source string is an es6 module