chore: better types

packages/svelte/src/internal/client/custom-renderer/index.js

@@ -27,7 +27,7 @@ import { get_parent_node, remove_child } from '../dom/operations.js';
  * @property {(element: TElement | TFragment)=>TNode | null} getFirstChild - Return the first child of the element, or null if it has no children. This should work for both elements and fragments
  * @property {(element: TElement | TFragment)=>TNode | null} getLastChild - Return the last child of the element, or null if it has no children. This should work for both elements and fragments
  * @property {(node: TElement | TTextNode | TComment)=>TNode | null} getNextSibling - Return the next sibling of the node, or null if it has no next sibling
- * @property {(parent: TElement | TFragment, element: TNode, anchor: TNode | null)=>void} insert - Insert the element into the parent before the anchor (if the anchor is null, insert at the end). This should work for both elements and fragments as parents. If `element` is a fragment, all of it's children should be inserted, not the fragment itself. If the element already has a parent, it should be removed from it's current parent before being inserted into the new parent.
+ * @property {(parent: TElement | TFragment, element: TNode, anchor: TElement | TTextNode | TComment | null)=>void} insert - Insert the element into the parent before the anchor (if the anchor is null, insert at the end). This should work for both elements and fragments as parents. If `element` is a fragment, all of it's children should be inserted, not the fragment itself. If the element already has a parent, it should be removed from it's current parent before being inserted into the new parent.
  * @property {(node: TElement | TTextNode | TComment)=>void} remove - Remove the node from the tree
  * @property {(element: TElement | TTextNode | TComment)=>TNode | null} getParent - Return the parent of the element, or null if it has no parent
  * @property {(target: TElement, type: string, handler: any, options?: any)=>void} addEventListener - Add an event listener of the given type and handler to the target node, with optional options

packages/svelte/types/index.d.ts

@@ -2642,7 +2642,7 @@ declare module 'svelte/renderer' {
 		/**
 		 * - Insert the element into the parent before the anchor (if the anchor is null, insert at the end). This should work for both elements and fragments as parents. If `element` is a fragment, all of it's children should be inserted, not the fragment itself. If the element already has a parent, it should be removed from it's current parent before being inserted into the new parent.
 		 */
-		insert: (parent: TElement | TFragment, element: TNode, anchor: TNode | null) => void;
+		insert: (parent: TElement | TFragment, element: TNode, anchor: TElement | TTextNode | TComment | null) => void;
 		/**
 		 * - Remove the node from the tree
 		 */