/** Gallery (preview cards) or List (flat rows); remembered in this browser. */
export type ArtifactView = "gallery" | "list";
export declare const ARTIFACT_VIEW_KEY = "opengeni:artifact-library:view:v1";
export declare function readArtifactView(): ArtifactView;
export declare function rememberArtifactView(view: ArtifactView): void;
/** A file's extension for its placeholder ("csv"), or nothing when it has none. */
export declare function artifactExtension(item: {
    filename?: string | undefined;
    title: string;
}): string | null;