Viewing methods/functions of a class/object - javascript?


I really only have experience with cloud 9, i own a chromebook so i haven’t been able to use other popular code editors. but, i was watching a tutorial where the guy was using some other editor, not sure which one. anyways, upon highlighting or hovering the cursor over the text of firebase or HttpParams or any object/class that has methods or functions that can be called, a popup with a list of all the methods would appear on the screen. does cloud 9 offer this feature? it seems like it could be handy. i also, noticed something similar that works in javascript but not typescript. it seems like built in js methods provide what the arguments should be a link to docs. anyways, just curious.