feat: CLI argument --fail-on-hints

[bfanger]

Feature
svelte-check --fail-on-hints will exit with error code when there are hints, similar to --fail-on-warnings

Use case
I want my CI and commit hooks to fail when there are hints, that way I can prevent committing code with hints such as:

/path/to/Component.svelte:10:3
Hint: 'someVariable' is declared but its value is never read. (ts)

[dummdidumm]

Thanks for the PR! Could you also update the writer's completion method so that hints also appear in the summary? Else it might feel odd that the summary doesn't mention hints but still fails.

[bfanger]

Also in the machine output?

[dummdidumm]

Yes

[bfanger]

I've refactored the completion method, going from 4 to 8 variations:

X error(s) and X warning(s)
X error(s)
X warning(s)
no errors and no warning

to:

X error(s), X warning(s) and X hint(s)
X error(s) and X warning(s)
X error(s) and X hint(s)
X error(s)
X warning(s) and X hint(s)
X warning(s)
X hint(s)
no errors, no warnings  and no hints

[dummdidumm]

I think at this point it might make sense - also from a maintenance perspective - to simplify this to X error(s), X warning(s) and X hint(s) where X >= 0. I think this also makes it easier to read because it's consistent, all three levels are always listed.

[bfanger]

This line was 102 characters, creating a linting error.

[bfanger]

Simplified

[dummdidumm]

👍