import type Resource from '../resources/resource';
import type MapPreviewer from './map';
import ImagePreviewer from './image';
export type AnyPreviewer = MapPreviewer | ImagePreviewer;
/**
 * Every preview a single resource offers. A list, because one resource can be worth showing more
 * than one way: a georeferenced scan is both an image to page through and a map to overlay, and
 * each of those is its own tab.
 */
export declare function previewersFor(resource: Resource): Promise<AnyPreviewer[]>;
/**
 * Every preview a list of resources offers, in the order they were given - which is the tab order.
 * Never rejects: this is awaited before the tabs are rendered, where a rejection would leave the
 * whole record without a preview rather than the one reference that failed.
 *
 * A location is the exception to that order, and goes last. It says where the record is, which is
 * worth a tab only when nothing else drew a map - a scan with no georeferencing to place it, or a
 * record with nothing previewable at all. Settled here rather than where the resources were built,
 * because a manifest is a map only if it turns out to be georeferenced and finding that out means
 * fetching it.
 */
export declare function previewersForResources(resources: Resource[]): Promise<AnyPreviewer[]>;