/**
 * Svelte context wiring for the opt-in Three.js interactive surface-chart
 * renderer flag (mirrors `smart-art-3d-context.ts`, which uses the same
 * pattern for SmartArt). `PowerPointViewer` provides its `surfaceChart3D`
 * prop from the root; `ElementRenderer` consumes it deep in the tree to
 * choose the WebGL scene (camera orbit/zoom via OrbitControls) over the
 * static SVG isometric projection for `surface`/`surface3D` charts.
 *
 * The provided value is a getter function, not a raw boolean, so a change to
 * the root `surfaceChart3D` prop stays visible to consumers (context is
 * captured once at component initialisation; closing over the prop keeps it
 * live).
 */
export declare const SurfaceChart3DContextKey: unique symbol;
/** Provide the `surfaceChart3D` opt-in flag to the component subtree (root only). */
export declare function provideSurfaceChart3D(getFlag: () => boolean): void;
/** Read the surface-chart 3D opt-in flag; defaults to `false` when not provided. */
export declare function useSurfaceChart3D(): boolean;
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