Visual Studio 2017, JavaScript intellisense inconsistencies
It looks like the latest update March 14, 2017 (build 26228.09) caused this issue, you can go to Control Panel—Programs and Features-View Installed updates and remove this update, then reopen VS to check the intellisense. If it works, which means this update lead to this issue, you can temporarily not install this updat
I've noticed the Microsoft Report Projects for Visual Studio Extension can cause problems such as this when being used in a project, A couple of mine have broken right after I add my SQL Server Report project to the solution and restarted visual studio.. So for now I remove my Report project from the solution but I hope Microsoft fixes this issue