Is

toxiproxyGo

A TCP proxy for simulating network failures and latency to test application resiliency in development and CI environments.

@sindresorhus/isTypeScript

A comprehensive JavaScript type checking library with TypeScript support, type guards, and assertions.

is-numberJavaScript

A JavaScript utility that reliably checks if a value is a finite number, handling edge cases like strings, NaN, and Infinity.

is-windowsJavaScript

Detects if the current platform is Windows, including Cygwin and MSYS/MinGW environments.

isElixir

A fast, extensible, and easy-to-use data structure validation library for Elixir with nested structure support.