import { ComputedPlacement, ITourDelegate, NoElement, Rect } from '@thisway/base';
import { Size } from '@thisway/utils';
import { Readable } from 'svelte/store';
import { IStepOptionsContext, RenderState } from './context';
export declare function observeElement(renderState$: Readable<RenderState>, popoverSize$: Readable<Size>, delegate: ITourDelegate, stepOptionsContext: IStepOptionsContext, updatePositionSignal$: Readable<number>): {
    elementBounding$: Readable<NoElement | Rect | undefined>;
    placement$: import('svelte/store').Writable<ComputedPlacement | undefined>;
};