/**
 * Pure slide-navigation and zoom-step helpers for the Svelte viewer.
 * Kept framework-free so they are trivially unit-testable.
 */
/** Clamp a slide index into `[0, count - 1]` (0 when there are no slides). */
export declare function clampSlideIndex(index: number, count: number): number;
/** Keyboard-driven navigation intents. */
export type NavigationAction = 'next' | 'prev' | 'first' | 'last';
/**
 * Map a `KeyboardEvent.key` to a navigation action, mirroring the slideshow
 * conventions used by the other bindings (arrows, paging keys, space, Home/End).
 */
export declare function resolveNavigationKey(key: string): NavigationAction | undefined;
/**
 * Zoom bounds and step, re-exported from `pptx-viewer-shared`.
 *
 * These used to be a local 1.25x multiplicative step, so one press of the same
 * button zoomed 25% here and 10% in React/Vue/Angular. The arithmetic now lives
 * in one place for all five bindings; these names stay because they are part of
 * this package's public API.
 */
export { ZOOM_MAX_PERCENT, ZOOM_MIN_PERCENT, zoomInPercent, zoomOutPercent, } from 'pptx-viewer-shared';
/**
 * Fit-to-viewport scale for a canvas inside a viewport, with breathing room.
 * Returns a strictly positive scale (falls back to 1 while unmeasured).
 */
export declare function fitScale(viewportWidth: number, viewportHeight: number, canvasWidth: number, canvasHeight: number, padding?: number): number;
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