38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
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'use strict';
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var fnToStr = Function.prototype.toString;
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var constructorRegex = /^\s*class\b/;
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var isES6ClassFn = function isES6ClassFunction(value) {
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try {
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var fnStr = fnToStr.call(value);
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return constructorRegex.test(fnStr);
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} catch (e) {
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return false; // not a function
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}
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};
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var tryFunctionObject = function tryFunctionToStr(value) {
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try {
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if (isES6ClassFn(value)) { return false; }
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fnToStr.call(value);
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return true;
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} catch (e) {
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return false;
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}
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};
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var toStr = Object.prototype.toString;
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var fnClass = '[object Function]';
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var genClass = '[object GeneratorFunction]';
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var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
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module.exports = function isCallable(value) {
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if (!value) { return false; }
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if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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if (typeof value === 'function' && !value.prototype) { return true; }
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if (hasToStringTag) { return tryFunctionObject(value); }
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if (isES6ClassFn(value)) { return false; }
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var strClass = toStr.call(value);
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return strClass === fnClass || strClass === genClass;
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};
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