/**
* Optional callback for collecting CSS hrefs during tree traversal.
* Only called server-side when processing
*/
export type CssHrefCollector = (href: string) => void;
/**
* Wait for all lazy elements in a tree to be resolved.
* This ensures client component chunks are fully loaded before rendering,
* preventing Suspense boundaries from flashing during SWR navigation.
*
* Also collects CSS hrefs from
* elements for preloading in .
*
* @param tree - The tree to process
* @param cssCollector - Optional callback to collect CSS hrefs (server-only)
*/
export declare function awaitLazyElements(tree: unknown, cssCollector?: CssHrefCollector): Promise;