export { annotate, applyAnnotateOps, pruneExpired, renderLayer };
type StoredAnnotation = {
    id: string;
    spec: any;
    expiresAt?: number;
};
/**
 * Fold an annotate payload into the current annotation list.
 *
 * Pure, so the add/update/clear semantics are testable without a browser.
 *
 * @param current Annotations currently on screen.
 * @param payload The step's `annotate` value.
 * @param now Millisecond clock, injected so `duration` is testable.
 * @returns The new list, the ids that are newly added (only those animate in),
 *   and any error that should fail the step.
 */
declare function applyAnnotateOps(current: StoredAnnotation[], payload: any, now: number): {
    next: StoredAnnotation[];
    added: string[];
    error?: string;
};
/** Drop annotations whose `duration` has elapsed. */
declare function pruneExpired(entries: StoredAnnotation[], now: number): StoredAnnotation[];
/**
 * Resolve and mount the current annotation set into the page.
 *
 * Exported because navigation re-mounts the same set: a fresh document has no
 * layer, so the runner calls this again rather than duplicating the pipeline.
 */
declare function renderLayer({ config, driver, entries, annotationTheme, newIds, departing, }: {
    config: any;
    driver: any;
    entries: StoredAnnotation[];
    annotationTheme?: any;
    newIds?: string[];
    departing?: StoredAnnotation[];
}): Promise<{
    errors: string[];
}>;
declare function annotate({ config, step, driver, annotationTheme, }: {
    config: any;
    step: any;
    driver: any;
    annotationTheme?: any;
}): Promise<any>;
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