* Expose object of which slots have received content in `$$slots` ([#2106](https://github.com/sveltejs/svelte/issues/2106))
* Correctly disallow using lifecycle hooks after synchronous component initialisation ([#4259](https://github.com/sveltejs/svelte/issues/4259), [#4899](https://github.com/sveltejs/svelte/issues/4899))
* Re-throw an unhandled rejection when an `{#await}` block with no `{:catch}` gets a rejection ([#5129](https://github.com/sveltejs/svelte/issues/5129))
* Add types to `createEventDispatcher` ([#5211](https://github.com/sveltejs/svelte/issues/5211))
* In SSR mode, do not automatically declare variables for reactive assignments to member expressions ([#5247](https://github.com/sveltejs/svelte/issues/5247))