'use strict';

var fnToStr = Function.prototype.toString;

var constructorRegex = /^s*classb/; var isES6ClassFn = function isES6ClassFunction(value) {

try {
        var fnStr = fnToStr.call(value);
        return constructorRegex.test(fnStr);
} catch (e) {
        return false; // not a function
}

};

var tryFunctionObject = function tryFunctionToStr(value) {

try {
        if (isES6ClassFn(value)) { return false; }
        fnToStr.call(value);
        return true;
} catch (e) {
        return false;
}

}; var toStr = Object.prototype.toString; var fnClass = '[object Function]'; var genClass = '[object GeneratorFunction]'; var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';

module.exports = function isCallable(value) {

if (!value) { return false; }
if (typeof value !== 'function' && typeof value !== 'object') { return false; }
if (typeof value === 'function' && !value.prototype) { return true; }
if (hasToStringTag) { return tryFunctionObject(value); }
if (isES6ClassFn(value)) { return false; }
var strClass = toStr.call(value);
return strClass === fnClass || strClass === genClass;

};