is-explicit/lib/is.js

Combines instance of operator and typeof operator in a way that works seamlessly with objects and literals.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.typeIsValid = typeIsValid;
exports.default = void 0;

var _isInstanceable = _interopRequireDefault(require("./is-instanceable"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

// This is a pain in the ass, but without it the babel transpile breaks Symbol
// checking, because Symbol !== require('babel-runtime/core-js/symbol')

/******************************************************************************/
// Helper

/******************************************************************************/
const TESTS = {
  string: type => type === String,
  boolean: type => type === Boolean,
  number: (type, value) => type === Number && !Number.isNaN(value),
  symbol: type => type === Symbol,
  function: (type, value) => type === Function,
  object: (type, value) => type === Object ? value !== null : type === Array ? Array.isArray(value) : value instanceof type,
  undefined: type => false
};

function typeIsValid(type, isArray = Array.isArray(type)) {
  return isArray ? type.length > 0 && type.every(_isInstanceable.default) : (0, _isInstanceable.default)(type);
}
/******************************************************************************/
// Main

/******************************************************************************/


function is(value, type) {
  type = this || type;
  const typesAsArray = Array.isArray(type); // Validate type arguments

  if (!typeIsValid(type, typesAsArray)) throw new Error(`${typesAsArray ? 'types' : 'type'} ` + `${typesAsArray ? 'are' : 'is'} expected to be ` + `${typesAsArray ? 'an array of' : 'a'} prototypal ` + `${typesAsArray ? 'functions' : 'function'}`); // Test types

  const test = TESTS[typeof value];
  if (!typesAsArray) return test(type, value);

  for (const t of type) if (test(t, value)) return true;

  return false;
}
/******************************************************************************/
// Exports

/******************************************************************************/


var _default = is;
exports.default = _default;