Last change
on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
976 bytes
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1 | 'use strict';
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2 |
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3 | var hasToStringTag = require('has-tostringtag/shams')();
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4 | var callBound = require('call-bind/callBound');
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5 |
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6 | var $toString = callBound('Object.prototype.toString');
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7 |
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8 | var isStandardArguments = function isArguments(value) {
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9 | if (hasToStringTag && value && typeof value === 'object' && Symbol.toStringTag in value) {
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10 | return false;
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11 | }
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12 | return $toString(value) === '[object Arguments]';
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13 | };
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14 |
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15 | var isLegacyArguments = function isArguments(value) {
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16 | if (isStandardArguments(value)) {
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17 | return true;
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18 | }
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19 | return value !== null &&
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20 | typeof value === 'object' &&
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21 | typeof value.length === 'number' &&
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22 | value.length >= 0 &&
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23 | $toString(value) !== '[object Array]' &&
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24 | $toString(value.callee) === '[object Function]';
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25 | };
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26 |
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27 | var supportsStandardArguments = (function () {
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28 | return isStandardArguments(arguments);
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29 | }());
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30 |
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31 | isStandardArguments.isLegacyArguments = isLegacyArguments; // for tests
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32 |
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33 | module.exports = supportsStandardArguments ? isStandardArguments : isLegacyArguments;
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