personae/app/utils/isBlank.js

export default function isBlank(value) {
  if (_isNil(value)) {
    return true
  }

  switch (checkType(value)) {
    case "string":
      return value === ""
    case "Array":
      return value.length === 0
    case "Set":
    case "Map":
      return value.size === 0
    default:
      return false
  }

  function checkType(value) {
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof
    if (value === null) {
      return "null"
    }

    const baseType = typeof value

    // Primitive types
    if (!["object", "function"].includes(baseType)) {
      return baseType
    }

    // Symbol.toStringTag often specifies the "display name" of the
    //   object's class. It's used in Object.prototype.toString().
    const tag = value[Symbol.toStringTag]
    if (typeof tag === "string") {
      return tag
    }

    // If it's a function whose source code starts with the "class" keyword
    if (
      baseType === "function" &&
      Function.prototype.toString.call(value)
        .startsWith("class")
    ) {
      return "class"
    }

    // The name of the constructor; for example `Array`, `GeneratorFunction`,
    //   `Number`, `String`, `Boolean` or `MyCustomClass`
    const className = value.constructor.name
    if (typeof className === "string" && className !== "") {
      return className
    }

    // At this point there's no robust way to get the type of value,
    //   so we use the base implementation.
    return baseType
  }
}