import type { MercuryPluginMiddlewareAssetMetadata } from "../typings/plugin";
/**
 * Recursively collects all file paths inside a directory and updates the provided metadata map.
 * @param sourceDir - The source directory to scan for files.
 * @param appDestinationFolderPrefix - The prefix to be added to the request path match.
 * @param middlewareMetadata - A map to store the metadata of each file found.
 * @param root - The root directory to calculate relative paths (defaults to sourceDir).
 */
export declare function updateMetadataForProxiedFiles(sourceDir: string, appDestinationFolderPrefix: string, middlewareMetadata: Map<string, MercuryPluginMiddlewareAssetMetadata>, root?: string): Promise<void>;