Add --watch flag to deno check

[Skillz4Killz]

Hello 👋

I am hoping to request the ability to have something like tsc --watch. A method to be able to monitor all your files code to see if it would compile. Relying on an editor to tell you warnings only shows warnings in files you have open.

This is extremely useful in development and does not require having to continue deno run just to have it crash with errors so you can fix those and then run again just to crash again.

Use Case: Monitor that can easily show whether your code will or will not compile!

Thank you

[ahuggins-nhs]

#2401 (comment)

[ahuggins-nhs]

Even better: #7382

[lucacasonato]

@Skillz4Killz I guess you want deno cache --watch?

[Skillz4Killz]

@Skillz4Killz I guess you want deno cache --watch?

Yes, I think that would work. It was the first thing I tried but I think --watch doesn't work on cache. But as mentioned on Discord deno cache could be a confusing place for this. If you watch cache then you would be watching the downloaded files by Deno which are cached which as you can guess does not make any sense I do agree with them about this but I would take any solution for this because in my opinion this is a really neat feature when coding in TypeScript

[lucacasonato]

Well cache does two things:

1. Download and cache remote urls
2. Transpile and optionally typecheck the given URLs

deno cache --watch would watch all local files in the given module graph, transpile and optionally typecheck them (2). It would not re-download & cache remote URLs.

[bartlomieju]

@kitsonk would you be in favor of adding deno cache --watch?

[kitsonk]

I am indifferent. Clearly a low priority as it doesn't appear to have received any support from the community.