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Function to intercept functions calls even to nativ functions.
function interceptFunction (object, fnName, options) {
var noop = function () {};
var fnToWrap = object[fnName];
var before = options.before || noop;
var after = options.after || noop;
object[fnName] = function () {
before.apply(this, arguments);
var result = fnToWrap.apply(this, arguments);
after.apply(this, arguments);
return result
}
}
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