note when features were added

Author: Rich-Harris

packages/svelte/src/compiler/index.js

@@ -98,6 +98,8 @@ export function compileModule(source, options) {
  * The `modern` option (`false` by default in Svelte 5) makes the parser return a modern AST instead of the legacy AST.
  * `modern` will become `true` by default in Svelte 6, and the option will be removed in Svelte 7.
  *
+ * The `loose` option, available since 5.13.0, tries to always return an AST even if the input will not successfully compile.
+ *
  * @param {string} source
  * @param {{ filename?: string; rootDir?: string; modern?: boolean; loose?: boolean }} [options]
  * @returns {AST.Root | LegacyRoot}

packages/svelte/src/internal/client/render.js

@@ -272,9 +272,9 @@ let mounted_components = new WeakMap();
 /**
  * Unmounts a component that was previously mounted using `mount` or `hydrate`.
  *
- * If `options.outro` is `true`, [transitions](https://svelte.dev/docs/svelte/transition) will play before the component is removed from the DOM.
+ * Since 5.13.0, if `options.outro` is `true`, [transitions](https://svelte.dev/docs/svelte/transition) will play before the component is removed from the DOM.
  *
- * Returns a `Promise` that resolves after transitions have completed if `options.outro` is true, or immediately otherwise.
+ * Returns a `Promise` that resolves after transitions have completed if `options.outro` is true, or immediately otherwise (prior to 5.13.0, returns `void`).
  *
  * ```js
  * import { mount, unmount } from 'svelte';