1
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'use strict';
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2
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3
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var fnToStr = Function.prototype.toString;
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4
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5
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var constructorRegex = /^\s*class\b/;
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6
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var isES6ClassFn = function isES6ClassFunction(value) {
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7
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try {
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8
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var fnStr = fnToStr.call(value);
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9
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return constructorRegex.test(fnStr);
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10
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} catch (e) {
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11
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return false; // not a function
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12
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}
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13
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};
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14
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15
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var tryFunctionObject = function tryFunctionToStr(value) {
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16
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try {
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17
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if (isES6ClassFn(value)) { return false; }
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18
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fnToStr.call(value);
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19
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return true;
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20
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} catch (e) {
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21
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return false;
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22
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}
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23
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};
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24
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var toStr = Object.prototype.toString;
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25
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var fnClass = '[object Function]';
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26
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var genClass = '[object GeneratorFunction]';
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27
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var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
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28
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|
29
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module.exports = function isCallable(value) {
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30
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if (!value) { return false; }
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31
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if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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32
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if (typeof value === 'function' && !value.prototype) { return true; }
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33
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if (hasToStringTag) { return tryFunctionObject(value); }
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34
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if (isES6ClassFn(value)) { return false; }
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35
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var strClass = toStr.call(value);
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36
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return strClass === fnClass || strClass === genClass;
|
37
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};
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