--- /dev/null
+var global = require('../internals/global');
+var call = require('../internals/function-call');
+var isCallable = require('../internals/is-callable');
+var isObject = require('../internals/is-object');
+
+var TypeError = global.TypeError;
+
+// `OrdinaryToPrimitive` abstract operation
+// https://tc39.es/ecma262/#sec-ordinarytoprimitive
+module.exports = function (input, pref) {
+ var fn, val;
+ if (pref === 'string' && isCallable(fn = input.toString) && !isObject(val = call(fn, input))) return val;
+ if (isCallable(fn = input.valueOf) && !isObject(val = call(fn, input))) return val;
+ if (pref !== 'string' && isCallable(fn = input.toString) && !isObject(val = call(fn, input))) return val;
+ throw TypeError("Can't convert object to primitive value");
+};