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"use strict";
var isClassStr = RegExp.prototype.test.bind(/^\s*class[\s{/}]/)
, fnToString = Function.prototype.toString;
module.exports = function (fn) {
if (typeof fn !== "function") return false;
if (typeof fn.call !== "function") return false;
if (typeof fn.apply !== "function") return false;
return !isClassStr(fnToString.call(fn));
};