/**
 * ViewportCropOverlay — V12.12 + v0.12.0 orientation-aware (R2-lite).
 *
 * Translucent dim bars on the camera preview's PAN-AXIS edges
 * showing where the panorama engine's source-crop is.  The engine
 * clips ALONG the pan axis:
 *
 *   • Portrait capture (horizontal pan / Mode B):
 *     clip = sensor X (cols).  User perceives this as LEFT and RIGHT
 *     of their portrait view.
 *
 *   • Landscape capture (vertical pan / Mode A):
 *     clip = sensor Y (rows).  User perceives this as TOP and BOTTOM
 *     of their landscape view.
 *
 * ## v0.12.0 update (R2-lite)
 *
 * Pre-v0.12 this component assumed the host app was orientation-
 * locked to portrait, in which case ALL device orientations mapped
 * to JS-left + JS-right for the bars (because the user's vertical
 * mapped to JS-horizontal under portrait-lock).  Under R2-lite the
 * SDK no longer holds the UI in portrait, so JS coordinates align
 * with the physical device orientation reported by
 * `useDeviceOrientation()`.  The bars now live at:
 *
 *   portrait, portrait-upside-down → JS-left + JS-right  (horizontal pan)
 *   landscape-left, landscape-right → JS-top  + JS-bottom (vertical pan)
 *
 * Mounting: the flagship `<Camera>` component mounts this overlay
 * by default in v0.12.0 (PR-3 wiring); Layer-2 hosts can mount it
 * themselves via the public export.
 *
 * ## Bar dimensions
 *
 * Bar `(1 - panFraction) / 2` of the pan-axis extent.  For the
 * default engine constant `kPanAxisFractionRect = 0.70`, each bar
 * is 15 % of the pan-axis extent — visibly substantial, matching
 * what the engine clips out per frame.
 */
import React from 'react';
export interface ViewportCropOverlayProps {
    /**
     * Fraction of the PAN axis the engine keeps per frame, in (0, 1].
     * E.g. 0.70 for the V12.12 rectilinear engine's
     * `kPanAxisFractionRect`.  Values ≥ 1 hide the overlay (no clip).
     */
    panFraction: number;
}
export declare function ViewportCropOverlay({ panFraction, }: ViewportCropOverlayProps): React.JSX.Element | null;
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