40 lines
1.2 KiB
JavaScript
40 lines
1.2 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 /;
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var isES6ClassFn = function isES6ClassFn(value) {
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try {
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var fnStr = fnToStr.call(value);
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var singleStripped = fnStr.replace(/\/\/.*\n/g, '');
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var multiStripped = singleStripped.replace(/\/\*[.\s\S]*\*\//g, '');
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var spaceStripped = multiStripped.replace(/\n/mg, ' ').replace(/ {2}/g, ' ');
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return constructorRegex.test(spaceStripped);
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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 tryFunctionObject(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 (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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