Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Check if a file path is a binary file

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

unist utility to check if a node passes a test

Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Check if a character is alphanumerical

Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Brand checking of React Elements.

Detect whether the terminal supports Unicode

Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Check if a value is a plain object

Check if the character represented by a given Unicode code point is fullwidth

Check if a character is hexadecimal

Is this value a JS ArrayBuffer?

when you want to fire an event no matter how a process exits.

Check if the process is running inside a Docker container

React is a JavaScript library for building user interfaces.

Determines if an object can be used as an array

Check if a character is alphabetical

walk paths fast and efficiently