es-to-primitive
ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.
is-boolean-object
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
kind-of
Get the native type of a value.
typical
Isomorphic, functional type-checking for Javascript
has-value
Returns true if a value exists, false if empty. Works with deeply nested values using object paths.