Add changesets

.changeset/five-dolls-smash.md

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+---
+'@astrojs/svelte': major
+---
+
+Adds support for Svelte 5. Svelte 3 and 4 are no longer supported.
+
+The integration will now also no longer add `vitePreprocess()` by default if a preprocessor is not set up in `svelte.config.js`. It is recommended to set up the Svelte config manually so that features like IDE completion and syntax highlighting work properly.
+
+If you're using SCSS, Stylus, etc in your Svelte component style tags, make sure that the preprocessor is also set up in `svelte.config.js`. For example:
+
+```js
+// svelte.config.js
+import { vitePreprocess } from '@astrojs/svelte';
+
+export default {
+	preprocess: vitePreprocess(),
+};
+```
+
+Refer to the [Svelte 5 migration guide](https://svelte.dev/docs/svelte/v5-migration-guide) and [`@sveltejs/vite-plugin-svelte` changelog](https://github.com/sveltejs/vite-plugin-svelte/blob/main/packages/vite-plugin-svelte/CHANGELOG.md#400) for details of their respective breaking changes.

.changeset/tasty-coats-repair.md

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+---
+'@astrojs/solid-js': patch
+---
+
+Handles checking Svelte 5 component functions to avoid processing them as Solid components