| 1 | 'use strict';
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| 2 | var call = require('../internals/function-call');
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| 3 | var isObject = require('../internals/is-object');
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| 4 | var isSymbol = require('../internals/is-symbol');
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| 5 | var getMethod = require('../internals/get-method');
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| 6 | var ordinaryToPrimitive = require('../internals/ordinary-to-primitive');
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| 7 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 8 |
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| 9 | var $TypeError = TypeError;
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| 10 | var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
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| 11 |
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| 12 |
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| 13 |
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| 14 | module.exports = function (input, pref) {
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| 15 | if (!isObject(input) || isSymbol(input)) return input;
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| 16 | var exoticToPrim = getMethod(input, TO_PRIMITIVE);
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| 17 | var result;
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| 18 | if (exoticToPrim) {
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| 19 | if (pref === undefined) pref = 'default';
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| 20 | result = call(exoticToPrim, input, pref);
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| 21 | if (!isObject(result) || isSymbol(result)) return result;
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| 22 | throw new $TypeError("Can't convert object to primitive value");
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| 23 | }
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| 24 | if (pref === undefined) pref = 'number';
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| 25 | return ordinaryToPrimitive(input, pref);
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| 26 | };
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