lml-main
Version:
This is now a mono repository published into many standalone packages.
12 lines (9 loc) • 350 B
JavaScript
;
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));
};