rambdax/src/type.js

Extended version of Rambda - a lightweight, faster alternative to Ramda

export function type(input){
  if (input === null){
    return 'Null'
  } else if (input === undefined){
    return 'Undefined'
  } else if (Number.isNaN(input)){
    return 'NaN'
  }
  const typeResult = Object.prototype.toString.call(input).slice(8, -1)

  return typeResult === 'AsyncFunction' ? 'Promise' : typeResult
}