Hot reloading with Typescript check

[jsantos42]

Goals

1. Add TS support to the Next compiler, so that hot reloading is prevented if there are TypeErrors

Non-Goals

No response

Background

When we run tsc && next dev, if there are any TS errors the process will fail. However, this TS error check only happens on the initial launch. Which means, if I introduce a type error, the hot reload of Next will not throw an error, and will instead reload the page normally.
If I understand correctly, that is because the Next compiler does not use TS.
Can we make it use it?

Proposal

Adding a tsconfig boolean option for the user to choose whether to use TS on hot reload
If that option is set to true: prepend tsc && to the Next compiler command.