This is a bit longer because there was some context to give, but basically what I did today was used the new JXA environment of OS X and its Objective-C bridge to build a little Cocoa app without an app bundle or using Script Editor.
On this page of the site you can watch the video online Recap: Building OS X apps from simple JavaScript with a duration of hours minute second in good quality, which was uploaded by the user Jeff Lindsay 28 August 2018, share the link with friends and acquaintances, this video has already been watched 498 times on youtube and it was liked by 13 viewers. Enjoy your viewing!