import { Ref } from 'vue';
import { PlaylistSchema } from '@signage-editor/core';
export declare function useStageScale(activePlaylist: Readonly<Ref<PlaylistSchema | null>>): {
    viewportRef: Ref<HTMLDivElement | null, HTMLDivElement | null>;
    scale: Ref<number, number>;
    updateScale: () => void;
    scheduleScaleUpdate: () => void;
    observeViewport: () => void;
    disposeStageScale: () => void;
};