import type { SummarizeFn } from "./summary.js";
export type MergeRule = "max" | "min" | "sum" | "concat" | "mean" | "range" | "mode" | "set" | "median" | "same" | "any" | "all" | "first" | "last" | "count" | ((values: string[]) => string);
/** merge a list of field values under a rule (display string out) */
export declare function aggregate(values: string[], rule: MergeRule): string;
/**
 * Build a SummarizeFn that merges member FIELDS into kv rows:
 * per-key rules (e.g. { "min score": "max", device: "set" }) with a
 * fallback rule (default "mode") for unlisted keys. Used as rgui's
 * default pseudo summary when the host provides none.
 */
export declare function fieldSummarize(rules?: Record<string, MergeRule>, fallback?: MergeRule): SummarizeFn;
/** rgui's default data-merge summary (mode for every field) */
export declare const defaultSummarize: SummarizeFn;
/**
 * Extremum under an ordering — the generalization behind max/min/any/all.
 * Give an enum order (["ok","warn","error"] → severity) or a key function
 * (Date.parse → latest). dir "max" picks the greatest.
 *
 *   fieldSummarize({ status: ordered(["ok","warn","error"]) })   // worst
 *   fieldSummarize({ updated: ordered(Date.parse, "max") })      // latest
 */
export declare function ordered(order: string[] | ((v: string) => number), dir?: "max" | "min"): (values: string[]) => string;
/**
 * ADVANCED: arbitrary quantile of the numeric values (q in 0..1, linear
 * interpolation). The everyday cases have plain names — use "min", "max",
 * "median" — reach for this only when you really need e.g. a p95.
 */
export declare function quantile(q: number): (values: string[]) => string;
/**
 * Top-k histogram — mode generalized: topK(1) ≡ "mode",
 * topK(2)(["en","ja","en","de","ja","en"]) → "en ×3, ja ×2".
 */
export declare function topK(k: number): (values: string[]) => string;
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