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25 lines
1001 B
25 lines
1001 B
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 = 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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