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

Is this value a JS SharedArrayBuffer?

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

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

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

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

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

Check if the process is running inside Windows Subsystem for Linux (Bash on Windows)

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

Is this an arguments object? It's a harder question than you think.

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

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

Check if a file path is a binary file

unist utility to check if a node passes a test

Is this value a JS ArrayBuffer?

Resolve a URI relative to an optional base URI

Brand checking of React Elements.

Check if a character is alphanumerical

Check if the process is running inside a Docker container

Detect whether the terminal supports Unicode