The goal is to automate a users workflow, by scraping the current webpage, preparing a structure and returning it in a format with a shortened URL.
The contributions from the stackoverflow community contributed an effective solution needed.
From what I'm reading in the documentation of https://api.jquery.com/jquery.getscript/ the error seems legit.
The callback is fired once the script has been loaded but not necessarily executed.
You should have a look at the documentation regarding proper integration of the javascript library presented across these following links
However I think you could fix your problem by loading the library and providing a callback function reference which will be executed once the library has been loaded and executed.
I think that what you should do is wrap the bits requiring a gapi instance in a callback function, say gapiIsLoaded like so
function gapiIsLoaded() {
gapi.client.setApiKey("<API_KEY_HERE>");
gapi....
}
..and point the getScript function to this URL instead