import type { App } from 'vue';
import type { BreadcrumbLeafHandle } from './types';
/** App-scoped map of `:leaf-id` → leaf handle, for the rare two-breadcrumb case. */
export type BreadcrumbLeafRegistry = Map<string, BreadcrumbLeafHandle>;
export declare function provideBreadcrumbLeafRegistry(registry?: BreadcrumbLeafRegistry, app?: App): BreadcrumbLeafRegistry;
export declare function injectBreadcrumbLeafRegistry(app?: App): BreadcrumbLeafRegistry | undefined;
/**
 * Override the current (leaf) crumb's label — the one imperative seam for
 * dynamic `/:id` page titles. Resolve in page `setup` (e.g. after
 * `useAsyncData`); the override auto-clears when the route changes.
 *
 * Targeting (the "both" decision): with no `id`, the nearest ancestor
 * `<VCBreadcrumb>` is targeted (zero config, the 99% case). Pass an `id`
 * matching a `<VCBreadcrumb :leaf-id>` to disambiguate when two
 * breadcrumbs co-exist (e.g. a layout breadcrumb + a section-local one).
 *
 * ```ts
 * const { set } = useBreadcrumbLeaf();
 * const { data } = await useAsyncData(() => fetchUser(route.params.id));
 * watchEffect(() => data.value && set(data.value.name));
 * ```
 */
export declare function useBreadcrumbLeaf(id?: string): BreadcrumbLeafHandle;
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