astro check --watch

[matthewp]

Body

• Accepted Date: 2-3-2023
• Reference Issues/Discussions: https://github.com/withastro/roadmap/discussions/436
• Implementation PR:

Summary

Add a --watch flag to astro check.

Background & Motivation

In development mode there isn't a way to know if your .astro files contain no errors, aside from editor feedback. If you use astro check you will know about errors, but might not see them until CI unless you remember to run the command before pushing.

Goals

• A way to check TS errors in .astro files during development workflow.

Non-Goals

• Having errors reported in the UI. This could be a nice enhancement in the future but would come with some downsides (such as possibly slowing down dev) that we want to punt on.

Example

astro check --watch

[matthewp]

astro check --experimental-watch

[ematipico]

With --watch, do we expect to validate ALL files and then start watching, or should we just start watching for changes?

[matthewp]

I think I would expect it to validate first, what do you think @Princesseuh?

[Princesseuh]

I would also expect it to validate first! Maybe worth to check what tsc --watch, svelte-check --watch and vue-tsc --watch do to see if there's a pattern we could follow.

[ematipico]

tsc does check and then starts watching. Makes sense to follow their lead. Good call @Princesseuh

[natemoo-re]

This proposal has been accepted and merged. https://github.com/withastro/roadmap/blob/main/proposals/0030-astro-watch-check.md