Node.js is at the beginning of the js file! function (e) {. } when and how to be called

in the app.js file, start the program through pm2. When and how to call this function
! function (e)
{

var t={};
function r(n)
{
    if(t[n])return t[n].exports;
    var s=t[n]={i:n,l:!1,exports:{}};
    return e[n].call(s.exports,s,s.exports,r),s.l=!0,s.exports
}
r.m=e,r.c=t,
r.d=function(e,t,n)
{
r.o(e,t)||Object.defineProperty(e,t,{configurable:!1,enumerable:!0,get:n})
},
r.n=function(e)
{
    var t=e&&e.__esModule?function(){return e.default}:function(){return e};
    return r.d(t,"a",t),t
},
r.o=function(e,t)
{return Object.prototype.hasOwnProperty.call(e,t)},
r.p="",r(r.s=25)

}-sharp-sharp-sharp problem description

the environmental background of the problems and what methods you have tried

related codes

/ / Please paste the code text below (do not replace the code with pictures)

what result do you expect? What is the error message actually seen?

Feb.11,2022

!function(){
    // something
}()
// 
(function(){
    // something
})()

all execute functions immediately, and adding! ~ + before function is equivalent to not adding.

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