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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));
- };
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