Type check values
Function argument validation for humans
Validate the type of object's properties.
Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
Check if the given value is of the particular type or types.
Allows runtime-check that object implements an interface (missing functionality in TypeScript)
Mixin ES6 based classes made easy & simple.
An instanceof alternative for non class based, factory oriented, programming.
Define errors without frills, but with stack traces and instanceof support.
Module for type detection
Lightweight library for determining types of variables based on battle-tested implementation from lodash but having a fraction of overall size.
Provides functionality for type checking
Validate the type of array's items.