/**
 * CaptureDebugOverlay — diagnostic overlay for capture sessions.
 *
 * Shows the live engine state in a floating pill at the top of the
 * capture screen so operators can see:
 *
 *   - which frame outcome the engine just emitted (accept/skip/reject)
 *   - keyframe count vs. cap (e.g. "3 / 6")
 *   - per-frame newContent fraction + overlap percent
 *   - latest processingMs (how long the gate eval took)
 *   - JS-side IMU translation accumulator (when non-AR)
 *   - JS heap usage estimate (rough — RN doesn't expose Native heap)
 *
 * The overlay is gated by `<Camera>`'s `settings.debug` flag.  When
 * `debug = false` the component renders null and consumes no CPU.
 *
 * Why a separate component (not inline in Camera.tsx)?
 *
 *   Camera.tsx is already a 1200-line beast and the debug pill needs
 *   its own styling/layout that would distract from the main capture
 *   UX.  Splitting it out keeps Camera.tsx focused and the debug
 *   surface easy to evolve independently (future F9 work — port the
 *   richer memory bubble + stitch toast from the RetaiLens host).
 *
 *   This component is intentionally PRESENTATIONAL — all data is
 *   pushed in as props.  The host (Camera.tsx) owns the
 *   subscriptions / refs / state and decides when to mount the
 *   overlay.
 */
import React from 'react';
import type { IncrementalState } from '../stitching/incremental';
export interface CaptureDebugOverlayProps {
    /** Latest engine state (null = no capture in progress). */
    incrementalState: IncrementalState | null;
    /** JS-side IMU translation accumulator in metres (non-AR mode). */
    imuTranslationMetres?: number | null;
    /** Capture-source label so the operator knows which gate path is live. */
    captureSource: 'ar' | 'non-ar';
    /** Effective frame selection mode that's running right now. */
    frameSelectionMode: 'time-based' | 'pose-based' | 'flow-based';
    /** Effective stitchMode setting (operator-set, before auto-resolution). */
    stitchMode: 'auto' | 'panorama' | 'scans';
}
export declare function CaptureDebugOverlay({ incrementalState, imuTranslationMetres, captureSource, frameSelectionMode, stitchMode, }: CaptureDebugOverlayProps): React.JSX.Element;
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