This PR removes all of the custom HMR handling we had in the
`@tailwindcss/vite` plugin.
When Vite 7.1 was introduced, Vite stopped performing a full page reload
for unknown files and instead started performing normal `hmr` updates.
This resulted in this issue:
https://github.com/tailwindlabs/tailwindcss/issues/19637
At the time, it felt like something we could easily re-add: if a file is
not covered by Vite, we can perform a `full-reload`. This meant that a
`.php` file would trigger a full page reload as expected.
The reason the `.php` file triggered Vite in the first place is because
those files were scanned by us (`@tailwindcss/vite`) so it made sense.
However, this then resulted in a plethora of issues, and it feels a bit
like a game of whac-a-mole.
- https://github.com/tailwindlabs/tailwindcss/issues/19744
- https://github.com/tailwindlabs/tailwindcss/issues/19903
- https://github.com/tailwindlabs/tailwindcss/issues/20320
- https://github.com/tailwindlabs/tailwindcss/issues/20378
- https://github.com/tailwindlabs/tailwindcss/issues/20411Fixes: #19744Fixes: #19903Fixes: #20320Fixes: #20378Fixes: #20411
We kept updating the logic by safelisting certain extensions, checking
different servers and/or environments, handling the fact that `server`
in the callback could be absent in `experimental.bundledDev` mode, etc.
etc.
Now, when investigating the last issue
(https://github.com/tailwindlabs/tailwindcss/issues/20411), I can
trigger full reloads by changing `.json`, `.yaml` or `.svg` files. This
makes sense since they aren't handled by default.
So thinking about this more, I think it's just not Tailwind's
responsibility to tell Vite to reload the browser or not. Yes, we use
the `addWatchFile` API, so files are being watched because of us.
However, our only goal is to update the `.css` file (and HMR that).
This means that we can just drop all the custom HMR handling we have in
`@tailwindcss/vite`.
This also means that
https://github.com/tailwindlabs/tailwindcss/issues/19637 would regress
and won't trigger full page reloads. But this can be easily handled by a
plugin responsible for this behavior:
- https://github.com/ElMassimo/vite-plugin-full-reload
## Test plan
1. All tests pass
2. Manually tested and changing unknown files don't result in a full
page reload
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