export type ThumbViewerKind = "pdf" | "pptx";
/** Unified default: thumbnail strip visible on first load. */
export declare const DEFAULT_THUMB_STRIP_VISIBLE = true;
/** Config override wins; else localStorage; else unified default (hidden). */
export declare function resolveThumbStripVisible(viewer: ThumbViewerKind, configValue?: boolean): boolean;
export declare function persistThumbStripVisible(viewer: ThumbViewerKind, visible: boolean): void;
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