import { BeatHtmlFragment } from 'mulmocast/browser';
/** All this module needs of its container. An HTMLElement satisfies it; so can a test double. */
export type FragmentHost = {
    querySelectorAll: (selectors: string) => ArrayLike<unknown>;
};
/** Load a CDN script once. Concurrent calls for the same URL share one load. */
export declare const loadScript: (src: string) => Promise<void>;
export declare const requiredRuntimes: (fragments: readonly (BeatHtmlFragment | undefined)[]) => string[];
export declare const requiredChartPlugins: (fragments: readonly (BeatHtmlFragment | undefined)[]) => string[];
export declare const collectedCss: (fragments: readonly (BeatHtmlFragment | undefined)[]) => string;
/**
 * Draw every chart and diagram inside `container`, replacing whatever the previous call drew.
 * Only the most recent call for a container draws; earlier ones stop at their next await.
 */
export declare const driveRuntimes: (container: FragmentHost, fragments: readonly (BeatHtmlFragment | undefined)[]) => Promise<void>;
/**
 * Destroy whatever a container drew and forget it.
 *
 * A per-beat host is unmounted when its beat is deleted or the list is torn down, and
 * Chart.js keeps a live instance per canvas until it is told otherwise. Without this the
 * instances outlive their canvases.
 */
export declare const releaseRuntimes: (container: FragmentHost | null) => void;
/** Test seam: forget which scripts have been loaded. */
export declare const resetLoadedScripts: () => void;