feat(watcher): clear screen on each restart

[bartlomieju]

Closes #10622

Quality of life improvement:

Screen.Recording.2021-10-31.at.14.14.33.mov

[ry]

do other systems do this?

[bartlomieju]

do other systems do this?

I saw it in Vite and Next.js

[lucacasonato]

I am in favor.

[David-Else]

@ry It would be great to get this merged soon! It is needed in Neovim's terminal to use Deno's built-in testing, without it the results just disappear from the bottom of the terminal as they update. The user has to focus on the terminal window and scroll down, this makes it useless in this situation.

[Im-Beast]

I'm not sure whether I should create separate issue for that (because it's QOL improvement just like clearing the screen), but imho after each restart watcher should also disable terminal raw mode (Deno.setRaw), as it makes it impossible to kill running command using Ctrl+C.

[bartlomieju]

I'm not sure whether I should create separate issue for that (because it's QOL improvement just like clearing the screen), but imho after each restart watcher should also disable terminal raw mode (Deno.setRaw), as it makes it impossible to kill running command using Ctrl+C.

@Im-Beast it seems it's not directly related to this PR, so I suggest to open a new issue.

[dsherret]

LGTM

[zifeo]

Some feedbacks after a few days using it: works well but should be configurable. This is a real pain on multi environments where files are linked (dylib) and watch/reload chained.

[bartlomieju]

@zifeo please open an issue if you want to have configuration added.