How to load an external library before interface loads?

[tothewine]

I see there is a Espo.loadLib function, but it does not seem to work. Say that I want to load this js: http://yourjavascript.com/31429113014/x.js
If I host the file myself it seems to work Espo.loadLib('x.js',function(){console.log('loaded ');}); but putting the whole url does not work, but that is not a big deal.

Yet I don't think that loading libraries in a view is the best design because of the delay each time. How can I load a library along with the others normally loaded by espo before the interface loads?

[tothewine]

After some fiddling, here is a partial solution: After defining a new library in /custom/Espo/Custom/Resources/metadata/app/jsLibs.json file (no __APPEND__ needed) in custom view we do...
Espo.define('custom:views/fields/iframe', ['views/fields/text', 'lib!MyLibrary'], function (Dep) { // view... }

The only downside is that I wasn't able to get my library to be preemptively loaded in the pre-load.json file.