'use strict'; var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol'; var isPrimitive = require('./helpers/isPrimitive'); var isCallable = require('is-callable'); var isDate = require('is-date-object'); var isSymbol = require('is-symbol'); var ordinaryToPrimitive = function OrdinaryToPrimitive(O, hint) { if (typeof O === 'undefined' || O === null) { throw new TypeError('Cannot call method on ' + O); } if (typeof hint !== 'string' || (hint !== 'number' && hint !== 'string')) { throw new TypeError('hint must be "string" or "number"'); } var methodNames = hint === 'string' ? ['toString', 'valueOf'] : ['valueOf', 'toString']; var method, result, i; for (i = 0; i < methodNames.length; ++i) { method = O[methodNames[i]]; if (isCallable(method)) { result = method.call(O); if (isPrimitive(result)) { return result; } } } throw new TypeError('No default value'); }; var GetMethod = function GetMethod(O, P) { var func = O[P]; if (func !== null && typeof func !== 'undefined') { if (!isCallable(func)) { throw new TypeError(func + ' returned for property ' + P + ' of object ' + O + ' is not a function'); } return func; } return void 0; }; // http://www.ecma-international.org/ecma-262/6.0/#sec-toprimitive module.exports = function ToPrimitive(input) { if (isPrimitive(input)) { return input; } var hint = 'default'; if (arguments.length > 1) { if (arguments[1] === String) { hint = 'string'; } else if (arguments[1] === Number) { hint = 'number'; } } var exoticToPrim; if (hasSymbols) { if (Symbol.toPrimitive) { exoticToPrim = GetMethod(input, Symbol.toPrimitive); } else if (isSymbol(input)) { exoticToPrim = Symbol.prototype.valueOf; } } if (typeof exoticToPrim !== 'undefined') { var result = exoticToPrim.call(input, hint); if (isPrimitive(result)) { return result; } throw new TypeError('unable to convert exotic object to primitive'); } if (hint === 'default' && (isDate(input) || isSymbol(input))) { hint = 'string'; } return ordinaryToPrimitive(input, hint === 'default' ? 'number' : hint); };