1
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'use strict';
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2
|
|
3
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var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
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4
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var toStr = Object.prototype.toString;
|
5
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|
6
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var isStandardArguments = function isArguments(value) {
|
7
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if (hasToStringTag && value && typeof value === 'object' && Symbol.toStringTag in value) {
|
8
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return false;
|
9
|
}
|
10
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return toStr.call(value) === '[object Arguments]';
|
11
|
};
|
12
|
|
13
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var isLegacyArguments = function isArguments(value) {
|
14
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if (isStandardArguments(value)) {
|
15
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return true;
|
16
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}
|
17
|
return value !== null &&
|
18
|
typeof value === 'object' &&
|
19
|
typeof value.length === 'number' &&
|
20
|
value.length >= 0 &&
|
21
|
toStr.call(value) !== '[object Array]' &&
|
22
|
toStr.call(value.callee) === '[object Function]';
|
23
|
};
|
24
|
|
25
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var supportsStandardArguments = (function () {
|
26
|
return isStandardArguments(arguments);
|
27
|
}());
|
28
|
|
29
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isStandardArguments.isLegacyArguments = isLegacyArguments; // for tests
|
30
|
|
31
|
module.exports = supportsStandardArguments ? isStandardArguments : isLegacyArguments;
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