It’s a javascript app that uses the react library - which is an open source library originated by Meta. It’s supposed to be easier to maintain and port cross platform apps. However it is not as efficient as a native app and given the Start menu is so frequently used it’s probably not a very efficient way to program it (or parts of it - I think the start menu has reactive native components rather than entirely made in it).
It’s a javascript app that uses the react library - which is an open source library originated by Meta. It’s supposed to be easier to maintain and port cross platform apps. However it is not as efficient as a native app and given the Start menu is so frequently used it’s probably not a very efficient way to program it (or parts of it - I think the start menu has reactive native components rather than entirely made in it).
So, WTF would Microsoft make a core Windows component with Meta libraries? I remember when Microsoft would only use Microsoft libraries.