programatically add a function to a javascript file from another javascript -

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i want add function/code java script file script. have below code in a.js

/*some comments.. 4-5 lines*/ module.exports = {     aaa: aaa,     add: add };  var asd = 'test';  function aaa() {  console.log('ddddd --- ' + asd); }  function add(a, b) {  var sum = + b;  console.log(sum); }

from js file need add below function a.js , update module.exports list

function diff(c, d) {    ///some code }

i parsed contents of a.js , new function esprima parser , splice function added code. converted ast code recast , wrote file comments gone.

how insert code without affecting other content of original file?


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