var isObject = require('../internals/is-object'); // `ToPrimitive` abstract operation // https://tc39.es/ecma262/#sec-toprimitive // instead of the ES6 spec version, we didn't implement @@toPrimitive case // and the second argument - flag - preferred type is a string module.exports = function (input, PREFERRED_STRING) { if (!isObject(input)) return input; var fn, val; if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val; if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val; if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val; throw TypeError("Can't convert object to primitive value"); };