import type { CompactionResult, ExtensionAPI, SessionEntry } from "@earendil-works/pi-coding-agent";
import { type CompactionEnricher } from "./enrichers.js";
import { type CompactionInstructionDecodeError, type CompactionInstructionPolicy } from "./instructions.js";
import { type ProjectionOmittedCounts } from "./projections.js";
type CompactionEngine = "pi" | "fabric";
export type CutResult = {
    ok: true;
    summarized: SessionEntry[];
    firstKeptEntryId: string;
    firstSummarizedEntryId: string;
    lastSummarizedEntryId: string;
    lastTimestamp: string;
} | {
    ok: false;
    reason: "empty";
};
export declare const computeCut: (branchEntries: SessionEntry[]) => CutResult;
interface EntryRange {
    first: string;
    last: string;
}
export interface FabricCompactionDetailsV2 {
    compactor: "fabric";
    version: 2;
    sections: string[];
    coverage: {
        cumulativeSourceRange: EntryRange;
        liveCutRange: EntryRange;
    };
    counts: {
        branchEntries: number;
        cumulativeSourceEntries: number;
        sourceEvents: number;
        liveCutEntries: number;
        priorFabricV1: number;
        priorFabricV2: number;
    };
    omittedCounts: ProjectionOmittedCounts & {
        preserve: number;
    };
    instructionPolicy: CompactionInstructionPolicy;
    stableAddresses: {
        firstKeptEntryId: string;
        cumulativeSourceRange: EntryRange;
        recall: "session-entry-id-range";
    };
    timestamp: string;
}
export declare const fabricCompactionVersion: (details: unknown) => 1 | 2 | undefined;
export declare const compileFabricSummary: (branchEntries: SessionEntry[], tokensBefore: number, enrichers?: readonly CompactionEnricher[], customInstructions?: string) => {
    compaction: CompactionResult<FabricCompactionDetailsV2>;
} | {
    cancel: true;
    reason: string;
    instructionError?: CompactionInstructionDecodeError;
};
export interface CompactionHookOptions {
    getEngine: () => CompactionEngine;
    enrichers?: readonly CompactionEnricher[];
}
export declare const registerCompactionHook: (pi: ExtensionAPI, options: CompactionHookOptions) => void;
export {};
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