Further, I must agree with and say that 3rd party library/framework files should not be changed with light hand. Instead, you can change the whole Cordova's (or any other library's) version and deploy newer bits. You can change the Cordova version from your project properties. As for other 3rd party frameworks or libraries you can use either the AppBuilder Package Manager
or directly add the new files in your project navigator.
project and see if the index.js
file, under the js
folder is editable. Also, just as Sepehr has noted, you should be able to add new files
in order to write your code there.
I hope this helps.