/** Longest edge, in pixels, for a reference or gallery thumbnail. */
export declare const REFERENCE_THUMBNAIL_PX = 640;
/** Panels sit in a table cell, so they need far less. */
export declare const PANEL_THUMBNAIL_PX = 384;
/** Inline previews keyed by the source file's absolute path. */
export type Thumbnails = ReadonlyMap<string, string>;
export declare function encodeThumbnail(input: string | Buffer, edge: number): Promise<string>;
/** Grabs a frame half a second in, which skips fade-ups and black leaders. */
export declare function extractVideoPoster(path: string): Buffer | undefined;
/**
 * Disk-backed thumbnail cache scoped to one project directory.
 *
 * Every lookup is best-effort: an unreadable file, an exotic codec, or a
 * missing ffmpeg yields `undefined` and the caller falls back to showing a
 * path. Nothing here should ever fail a production command.
 */
export declare class ThumbnailCache {
    private readonly cachePath?;
    private entries;
    private dirty;
    private constructor();
    /** In-memory only. For callers with no project directory to persist into. */
    static ephemeral(): ThumbnailCache;
    static open(projectDir: string): Promise<ThumbnailCache>;
    /**
     * Thumbnail for one file. Videos are posterized with ffmpeg first; anything
     * sharp can decode is resized directly.
     */
    get(path: string, edge: number, kind?: 'image' | 'video'): Promise<string | undefined>;
    /** Drops entries for files that no longer exist, then writes if anything changed. */
    save(): Promise<void>;
}
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