realType.js

// module.exports = function realType(anyType){
// 	return global[Object.prototype.toString.call(anyType).slice(8, -1)]
// }

const extractType = anyInput => Object.prototype.toString.call(anyInput).slice(8, -1)

module.exports = function realType(anyType){
	let literalType = global[extractType(anyType)]
	return {
		literal: literalType,
		is: typeInput => typeInput === literalType,
		isNot: typeInput => typeInput !== literalType,
		isOneOf: function(){ return Array.from(arguments).some(test => test === literalType) },
		isNotOneOf: function(){ return Array.from(arguments).every(test => test !== literalType) },
		toString: () => extractType(anyType)
	}
}