import type { SessionRecord } from "./sessions.js";
import type { SourceWithContent } from "./synthesize.js";
export interface SourceRef {
    url: string;
    title: string;
}
export type LineKind = "same" | "add" | "del";
export interface DiffLine {
    kind: LineKind;
    text: string;
}
export interface SessionSide {
    id: string;
    question: string;
    createdAt: number;
    model: string;
    sourceCount: number;
    rounds: number;
    costUsd: number;
}
export interface SessionDiff {
    a: SessionSide;
    b: SessionSide;
    sources: {
        added: SourceRef[];
        removed: SourceRef[];
        shared: SourceRef[];
    };
    answer: {
        lines: DiffLine[];
        added: number;
        removed: number;
        unchanged: number;
    };
}
export declare function diffSessions(a: SessionRecord, b: SessionRecord): SessionDiff;
export declare function diffSources(a: SourceWithContent[], b: SourceWithContent[]): SessionDiff["sources"];
export declare function diffLines(a: string[], b: string[]): SessionDiff["answer"];
export interface RenderDiffOptions {
    color?: boolean;
    context?: number;
}
export declare function renderDiffText(diff: SessionDiff, opts?: RenderDiffOptions): string;
export declare const DIFF_NARRATE_SYSTEM = "You compare two research answers to the same (or a closely related) question, produced at different times. Summarize what substantively changed between the OLDER answer (A) and the NEWER answer (B).\n\nRules:\n- Focus on changes in facts, conclusions, numbers, and recommendations \u2014 not wording.\n- Lead with the single most important change.\n- Call out new claims in B, claims dropped from A, and any reversals.\n- If the two answers are materially the same, say so in one sentence.\n- Be concise: a short paragraph or a few bullets. No preamble.";
export declare function buildDiffNarrateUser(a: SessionRecord, b: SessionRecord): string;
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