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