import { ViewerMode } from 'pptx-viewer-shared';
import { CollaborationController } from '../collab';
import { EditorState } from '../editor/editor-state.svelte';
import { CreateViewerStateOptions } from './create-viewer-state-types';
import { PresentationLoader } from './presentation-loader.svelte';
import { ViewerState } from './viewer-state.svelte';
export interface ViewerDerivedDeps {
    loader: PresentationLoader;
    viewer: ViewerState;
    editor: EditorState;
    collab: CollaborationController;
    options: CreateViewerStateOptions;
    /** The live editable flag (not the raw host prop). */
    getEditable(): boolean;
}
/** Layout / zoom / mode values every part of the chrome reads, as live getters. */
export interface ViewerDerived {
    readonly scale: number;
    readonly effectivePercent: number;
    readonly displaySlides: EditorState['renderedSlides'];
    readonly activeSlide: EditorState['renderedSlides'][number] | undefined;
    readonly chromeVisible: boolean;
    readonly editingActive: boolean;
    readonly showRibbon: boolean;
    readonly viewerMode: ViewerMode;
}
/**
 * The viewer's derived view state (canvas scale, zoom percent, the rendered
 * slide array, chrome/editing/ribbon visibility, the resolved mode) plus the
 * `$effect`s that report the ones the host subscribes to. Split out of
 * `createViewerState` to keep that file under the repo's file-size budget.
 *
 * Every value is returned as a getter, not a snapshot, so a consumer reading
 * `derived.scale` outside an effect still tracks it. Named `use*`, not
 * `build*`: it registers the host-notification effects.
 */
export declare function useViewerDerived(deps: ViewerDerivedDeps): ViewerDerived;
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