/**
 * rgui core — summarize rule types.
 *
 * The host knows what a node MEANS, so it can summarize better than rgui:
 * when a node is too small to show its fields (level "small"), or when
 * nodes merge into a pseudo-node (level "pseudo"), rgui asks the host's
 * summarize rule for compact content and renders it screen-constant.
 */
import type { GraphNode } from "./graph.js";
export type SummaryContent = {
    kind: "text";
    lines: string[];
} | {
    kind: "kv";
    rows: [string, string][];
} | {
    kind: "canvas";
    /** screen-space, clipped; origin at the summary region's top-left */
    draw: (ctx: CanvasRenderingContext2D, rect: {
        width: number;
        height: number;
    }) => void;
    /** region height in px (default 36) */
    height?: number;
};
export interface SummaryInfo {
    /** true when summarizing a collapsed pseudo-node's members */
    collapsed: boolean;
    /** "small": single node below field readability; "pseudo": merged group */
    level: "small" | "pseudo";
    /** available screen size of the target region (px) */
    screen: {
        w: number;
        h: number;
    };
}
/** return null/undefined to fall back to rgui's default rendering */
export type SummarizeFn = (nodes: GraphNode[], info: SummaryInfo) => SummaryContent | null | undefined;
export declare const SUMMARY_LINE_H = 14;
/** height (px) a summary renders at — pure, canvas-free */
export declare function summaryContentHeight(c: SummaryContent): number;
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