Extend native function of javascript (callback)

*It may affect outer javascript and framework(like vue, angular, react etc...). I strongly recommend you use it in unavoidable case.

function insertCallback(parent, funcname, callback, ...args) {
    let oldFunc = parent[funcname] ? parent[funcname] : function (){}
    parent[funcname] = function() {
        oldFunc.apply(this, arguments)
        return callback(...args)
    }
}

sample is here