/** Ensure the presentation `@keyframes` are present in the document head. */
export declare function ensurePresentationKeyframes(): void;
/**
 * Upsert the current slide's native-animation `@keyframes` (`p:animClr` colour
 * ramps, staged builds, etc.) into a dedicated head-level `<style>`. Keyframe
 * rules are global, so a single head-level injection reaches the windowed stage
 * and the fullscreen element alike (mirrors the Vue binding rendering
 * `presentationKeyframesCss` in its presentation template). Passing an empty
 * string clears the rules (e.g. on slide change / leaving presentation).
 */
export declare function syncNativeAnimationKeyframes(css: string): void;
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