/**
 * CSS-based slide transition definitions for the View Transitions API.
 *
 * Each transition defines keyframes for `::view-transition-old(slide)`
 * and `::view-transition-new(slide)` pseudo-elements.
 *
 * The View Transitions API captures the old DOM as an image, updates
 * the DOM, then animates from old to new using these keyframes.
 */
export interface SlideTransition {
    /** A unique name for this transition */
    name: string;
    /** Duration in ms */
    duration?: number;
    /** CSS easing function */
    easing?: string;
    /** CSS for the old slide (exiting) — a CSS keyframes body */
    oldKeyframes: Keyframe[];
    /** CSS for the new slide (entering) — a CSS keyframes body */
    newKeyframes: Keyframe[];
}
export declare const fadeTransition: SlideTransition;
export declare const slideTransition: SlideTransition;
export declare const dropTransition: SlideTransition;
export declare const noneTransition: SlideTransition;
export declare const morphTransition: SlideTransition;
/**
 * Resolve a transition name string to a SlideTransition object.
 */
export declare function resolveTransition(name: string | undefined): SlideTransition | undefined;
/**
 * Inject a <style> element with view transition keyframes into the document.
 * Called once when the Deck mounts.
 */
export declare function injectTransitionStyles(transition: SlideTransition, direction: "forward" | "backward"): void;