1 | 'use strict';
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2 |
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3 | var fnToStr = Function.prototype.toString;
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4 |
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5 | var constructorRegex = /^\s*class\b/;
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6 | var isES6ClassFn = function isES6ClassFunction(value) {
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7 | try {
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8 | var fnStr = fnToStr.call(value);
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9 | return constructorRegex.test(fnStr);
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10 | } catch (e) {
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11 | return false;
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12 | }
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13 | };
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14 |
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15 | var tryFunctionObject = function tryFunctionToStr(value) {
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16 | try {
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17 | if (isES6ClassFn(value)) { return false; }
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18 | fnToStr.call(value);
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19 | return true;
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20 | } catch (e) {
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21 | return false;
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22 | }
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23 | };
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24 | var toStr = Object.prototype.toString;
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25 | var fnClass = '[object Function]';
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26 | var genClass = '[object GeneratorFunction]';
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27 | var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
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28 |
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29 | module.exports = function isCallable(value) {
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30 | if (!value) { return false; }
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31 | if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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32 | if (typeof value === 'function' && !value.prototype) { return true; }
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33 | if (hasToStringTag) { return tryFunctionObject(value); }
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34 | if (isES6ClassFn(value)) { return false; }
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35 | var strClass = toStr.call(value);
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36 | return strClass === fnClass || strClass === genClass;
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37 | };
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