svelte-kit build should respect vite.build.emptyOutDir

[milkbump]

Is your feature request related to a problem? Please describe.
Building using adapter-static, files from the previous build are still in the build folder after a subsequent build. Vite has a build.emptyOutDir: true default that svelte-kit seems to ignore.

Describe the solution you'd like
It would be nice if svelte-kit cleared the build directory, to avoid the build folder ballooning in size when doing multiple local builds.

Describe alternatives you've considered
Running rm -rf ./build && svelte-kit build is a good enough workaround for now.

[benmccann]

Duplicate of #1039

[kayakyakr]

@benmccann did the fix for #1039 handle rebuild if a file has been removed? I experienced it locally (with version next.89, not sure when that went out) when I removed a .svelte route, the generated html file was still present in build.

[kayakyakr]

This is still an issue with the latest. Seems like it needs to be an update to adapter-static. Recreation (for me):

1. Create an app with $layout, index, sveltePreprocess with scss, and adapter-static
2. In the $layout file, add some global styles
3. Build the app
4. Change the $layout file
5. Build the app again
6. In the build/app directory, there should now be two files named start.[hash].js

Requesting a reopen.