Check whether a binary version satisfies a semver range

Runtime library to validate data against TypeScript interfaces

A simple Node.js module to check if a TCP port is already bound.

Check if a local or remote port is reachable

Check if a value is a regular expression

Check if a file path is a text file

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

Try to downgrade the permissions of a process with root privileges and block access if it fails

Property based testing for Jest based on fast-check

Checks the ECMAScript version of .js glob against a specified version of ECMAScript with a shell command

Property based testing for Vitest based on fast-check

Check if a binary is working

Ensure a path doesn't contain null bytes

Parses and compiles CSS nth-checks to highly optimized functions.

Property based testing framework for JavaScript (like QuickCheck)

Core library for the 51Degrees Pipeline API

checks the all of the hyperlinks in a markdown text to determine if they are alive or dead

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

Check if a string is an IP address

Check if the process is running in a Continuous Integration (CI) environment