You can use word wrapping/line wrapping features of your IDE.
In Visual Studio Code:
Since v1.0 you can toggle word wrap:
- with the new command editor.action.toggleWordWrap,
 
- from the View
 
- menu (View > Toggle Word Wrap), or using the ALT+Z keyboard shortcut
  (for Mac: ⌥+Z).
 
Source HERE
Or you can use javascript string concatenation with + sign like this to build the key string and use it in your object:
var key = "hide(), show(), toggle(), fadeIn(), fadeOut(), fadeTo(), "+
          "fadeToggle(), slideDown(), slideUp(), slideToggle(), "+
          "animate(). Something different for text(), html(), "+
          "and val() , attr() and load() "
var obj = { [key] : "after each functions callback function can be executed?"}
or if you prefer in one statement:
var obj = { ["hide(), show(), toggle(), fadeIn(), fadeOut(), fadeTo(), "+
          "fadeToggle(), slideDown(), slideUp(), slideToggle(), "+
          "animate(). Something different for text(), html(), "+
          "and val() , attr() and load() "] : 
          "after each functions callback function can be executed?"}