IS Packages

ES2015 Number.MAX_SAFE_INTEGER ponyfill

Check if a string is a valid filename

Returns true if a path is a dot-directory.

Minimal JavaScript type checking library

Determine whether a given string is a newline character.

Validates if a value is undefined.

Check if a repository has untracked or added files

Returns `true` if a value exists in the given string, array or object.

Check if the process is running as administrator on Windows

Is this value a JS ArrayBuffer?

Tells, is given character a part of astral character, specifically, a high and low surrogate

Browser-friendly enhanced util fully compatible with standard node.js

Strict equality test (like ===) that handles both built-in and custom value objects (those with a valueOf function).

Check if a String/Buffer is TTF

Check if a String/Buffer/ArrayBuffer is OTF

typeof number, or use a default

Check if a value is something

Determine type of a variable

Determine if something is a React class component

Find out, is nested array/object/string/AST tree is empty