/**
 * About event handler — `if.event.about_displayed`.
 *
 * Produces the same structured banner as `handleGameStarted`, via the
 * shared `buildBannerBlocks` helper. The ABOUT action gives us a
 * flat `params: Record<string, string>` that mirrors `event.data.story`
 * — we project it into the `BannerStoryInfo` shape and reuse the
 * builder.
 *
 * Public interface: `handleAboutDisplayed`. Used by the pipeline's
 * event-type dispatch.
 *
 * Owner context: `@sharpee/engine` — internal prose pipeline.
 *
 * @see ADR-174 §Engine-internal prose pipeline (port from text-service)
 */
import type { ITextBlock } from '@sharpee/text-blocks';
import type { ISemanticEvent } from '@sharpee/core';
import type { HandlerContext } from './types';
/**
 * Handle `if.event.about_displayed` by showing the structured banner.
 *
 * Reads the about action's `params` payload (title, author, version,
 * description, engineVersion, buildDate, portedBy). The ABOUT action
 * does not currently pass `credits` directly; when present, the
 * builder falls back to `By {author}` for a single author-list line.
 * Stories that want richer ABOUT credit blocks should propagate
 * `credits` through the about action's params.
 */
export declare function handleAboutDisplayed(event: ISemanticEvent, context: HandlerContext): ITextBlock[];
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