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node_modules/es5-ext/object/is-plain-function.js

@@ -0,0 +1,11 @@
+"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));
+};