#check

Check if a URL is absolute

Check if a string matches the name of a Node.js builtin module

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

Check if something is a promise

If you use globs, this will make your code faster. Returns `true` if the given string looks like a glob pattern or an extglob pattern. This makes it easy to create code that only uses external modules like node-glob when necessary, resulting in much faster code execution and initialization time, and a better user experience. 55+ million downloads.

Check if a path is a file, directory, or symlink

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

utility to check if a node has a property

micromark extension to support GFM task list items

Check if a file path is a binary file

Check if a path is the current working directory

Isomorphic, functional type-checking for Javascript

Reliably determines if the code is running in Node.js. Treats Jest, React Native, Electron, and others like Node.js.

Check if a value is a regular expression

mdast extension to parse and serialize GFM task list items

Check if something is a Node.js stream

Check if a file path is a text file

Detect whether the terminal supports Unicode

Returns true if a value exists, false if empty. Works with deeply nested values using object paths.

Returns `true` if a file path appears to be relative. Moved from the "relative" lib.

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

Check if a value is an object

Checks if a newer version is available for command line interfaces

Check if your code is running as an npm or yarn script

Check if a value is a plain object

Returns true if a filepath is absolute. The original path-is-absolute.

Check if something is a generator function

Check if the process is running in an SSH session