1 var global = require('../internals/global');
2 var call = require('../internals/function-call');
3 var isObject = require('../internals/is-object');
4 var isSymbol = require('../internals/is-symbol');
5 var getMethod = require('../internals/get-method');
6 var ordinaryToPrimitive = require('../internals/ordinary-to-primitive');
7 var wellKnownSymbol = require('../internals/well-known-symbol');
9 var TypeError = global.TypeError;
10 var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
12 // `ToPrimitive` abstract operation
13 // https://tc39.es/ecma262/#sec-toprimitive
14 module.exports = function (input, pref) {
15 if (!isObject(input) || isSymbol(input)) return input;
16 var exoticToPrim = getMethod(input, TO_PRIMITIVE);
19 if (pref === undefined) pref = 'default';
20 result = call(exoticToPrim, input, pref);
21 if (!isObject(result) || isSymbol(result)) return result;
22 throw TypeError("Can't convert object to primitive value");
24 if (pref === undefined) pref = 'number';
25 return ordinaryToPrimitive(input, pref);