import { Scene, Spec, View, SceneItem, SceneGroup } from 'vega';
import { OlliDataset } from 'olli';
export declare function getVegaView(spec: Spec): Promise<View>;
export declare function getVegaScene(view: View): SceneGroup;
export declare function filterUniqueObjects<T>(arr: T[]): T[];
export declare function findScenegraphNodes(scenegraphNode: Scene | SceneGroup | SceneItem, passRole: string): any[];
export declare function getData(scene: SceneGroup): OlliDataset[];
export declare function getVegaAxisTicks(scene: any): any;
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