/**
 * The scanner fires onProgress once per file, so a large scan would otherwise
 * broadcast thousands of scan_progress WebSocket frames. This throttle collapses
 * them to at most one per whole-percent step, plus a guaranteed final frame when
 * the scan completes (scanned === total). Caps frames at ~101 regardless of the
 * file count, while always delivering the terminal 100% update.
 *
 * Returns a predicate: call it with each (scanned, total) tick; it returns true
 * when that tick should be broadcast. Stateful — create one per scan.
 */
export declare function createScanProgressThrottle(): (scanned: number, total: number) => boolean;
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