declare class RegionExportController {
    private readonly mapEl;
    /** `hadElement` records whether an authored `<om-layer>` existed WHEN THE TILESET LOADED — see `visibleTilesets` for why "no element now" alone can't mean "removed". */
    private tilesets;
    constructor(mapEl: Element);
    /** The last committed ring on `target` — a draw widget's own polygon, same coords `snapshotIR`/measure read. `null` when nothing's been drawn yet (or the last shape isn't a polygon). */
    private lastRing;
    /**
     * Registered tilesets whose OWN `<om-layer>` is currently visible (spec:
     * issue #34 tier 1 — "measure/export only what's visible"). `visible`
     * reads directly off the DOM attribute — `!== "false"`, the exact check
     * `toggle-layer` itself uses (actions.ts) — not a reactive-props lookup,
     * so this stays consistent with a plain `visible="false"` author edit AND
     * with a live `toggle-layer` click, without needing this controller to
     * carry `layerIRs` around just for one boolean. A layer hidden AFTER it
     * loaded (the common case — someone toggles it off before exporting) is
     * excluded; one never registered at all (never fired `om-tileset-load`)
     * was already excluded by construction.
     *
     * A layer whose `<om-layer>` has since been REMOVED from the DOM (a
     * manifest edit, a story step, a framework re-render) is excluded too, and
     * its registry entry dropped on the way past — `this.tilesets` is only ever
     * appended to, so otherwise a deleted layer's geometry kept exporting
     * indefinitely.
     *
     * That's gated on `hadElement`, captured when the load event fired, rather
     * than on "no element right now": a programmatically-built layer legitimately
     * has no `<om-layer>` at all, and treating a missing element as removal
     * would exclude every such layer from export permanently. Seen-then-gone is
     * removal; never-seen is a DOM-less layer, which stays exportable.
     */
    private visibleTilesets;
    exportRegion(target: string, format: "glb" | "b3dm"): Promise<void>;
}
/** Exported so the `draw` widget can call this EAGERLY at render time (when `export-3d` is configured), before the user has drawn anything — see the constructor's own doc comment for why lazy binding on first export doesn't work. */
export declare function getRegionExportController(mapEl: Element): RegionExportController;
export {};