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to-primitive.js
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Tue, Mar 4, 11:37

to-primitive.js
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var call = require('../internals/function-call');
var isObject = require('../internals/is-object');
var isSymbol = require('../internals/is-symbol');
var getMethod = require('../internals/get-method');
var ordinaryToPrimitive = require('../internals/ordinary-to-primitive');
var wellKnownSymbol = require('../internals/well-known-symbol');
var $TypeError = TypeError;
var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
// `ToPrimitive` abstract operation
// https://tc39.es/ecma262/#sec-toprimitive
module.exports = function (input, pref) {
if (!isObject(input) || isSymbol(input)) return input;
var exoticToPrim = getMethod(input, TO_PRIMITIVE);
var result;
if (exoticToPrim) {
if (pref === undefined) pref = 'default';
result = call(exoticToPrim, input, pref);
if (!isObject(result) || isSymbol(result)) return result;
throw $TypeError("Can't convert object to primitive value");
}
if (pref === undefined) pref = 'number';
return ordinaryToPrimitive(input, pref);
};

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