my-idlers/node_modules/es5-ext/function/#/copy.js

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"use strict";
var mixin = require("../../object/mixin")
, validFunction = require("../valid-function")
, re = /^\s*function\s*([\0-')-\uffff]+)*\s*\(([\0-(*-\uffff]*)\)\s*\{/;
module.exports = function () {
var match = String(validFunction(this)).match(re), fn;
// eslint-disable-next-line no-new-func
fn = new Function(
"fn",
"return function " +
match[1].trim() +
"(" +
match[2] +
") { return fn.apply(this, arguments); };"
)(this);
try { mixin(fn, this); }
catch (ignore) {}
return fn;
};