/**
 * Finds out where a drag-out was dropped, by looking for what the shell wrote.
 *
 * Windows never tells the source application where a drop landed: it serves a
 * `DownloadURL` through the shell, which fetches the URL and writes the file
 * itself, so Chromium — and therefore Electron — only ever sees the request
 * (piège #58). The way around it is to stop announcing the payload and announce
 * a **uniquely named empty marker** instead: the shell writes *that* into the
 * drop folder, and finding it is what reveals the folder.
 *
 * This is a heuristic and is documented as one. It sweeps the places a drop
 * plausibly lands — the desktop, the downloads folder, every open Explorer
 * window, and one level of subdirectories of each, because dropping onto a
 * folder *icon* inside a window lands inside that folder. A drop anywhere else
 * is not found, and the caller falls back to a known directory rather than
 * failing.
 */
export declare class SidebarPlusDropLocator {
    /**
     * Waits for `markerName` to appear in one of the plausible drop folders.
     *
     * Returns the folder that received it, having deleted the marker; `null` if
     * it never turned up. Deletion is best effort: a marker held open by the
     * shell still identifies the right folder, so a failure to remove it is not
     * a failure to locate.
     */
    locate(markerName: string): Promise<string | null>;
    /** Where a file is delivered when the drop folder cannot be found. */
    fallbackFolder(): string;
    /**
     * The folders worth sweeping, widest first.
     *
     * Built once per drop rather than per sweep: enumerating shell windows
     * costs a process launch, and the set of open windows does not meaningfully
     * change between two sweeps 300 ms apart.
     */
    private candidateFolders;
    private childDirectories;
    /**
     * Paths of every open Explorer window.
     *
     * Asked of the shell itself through COM, which is the only thing that knows
     * them. There is no Node API for this and no Electron one either, hence the
     * out-of-process hop; measured at ~50 ms on the development machine, paid
     * once per drop.
     *
     * A window showing a virtual location (This PC, a search result) has no
     * filesystem path and throws on `Self.Path`; those are skipped rather than
     * failing the enumeration.
     */
    private explorerFolders;
}