Check Packages

Check whether a RegExp flag is supported

Function argument validation for humans

Is this a bluebird promise I see before me?

Check if a Buffer/Uint8Array is a GIF image

Check if a URL is relative

check if an AST node is a function of some sort

JavaScript Standard Style JSX support - ESLint Shareable Config

Type assertions aka less-broken `typeof`

Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)

Hook and modify stdout and stderr

Tiny wrapper around ansi-colors to add colored symbols and a timestamp.

Check if a string is HTML

Wrap your standards in a tortilla and cover it in special sauce.

Check if mobile browser.

JavaScript Standard Style

Check dependencies in your node module

ESLint shareable config for the Google style

Check if a Buffer/Uint8Array is a TAR file

A simple and composable way to validate data in JavaScript (and TypeScript).

Check whether a value is "empty".