/**
 * Decode-window census for full-pass journal planning.
 *
 * Packed columns stay resident. Planners decode at most
 * {@link JOURNAL_DECODE_WINDOW} `JournalEntry` objects before dropping the
 * window (a cooperative checkpoint is a valid drop point). The stderr metric
 * reports the current window and the peak since the last emit.
 */
import type { JournalEntry } from "./types.js";
/** Ceiling: a full-pass planner must drop its decoded window at this many rows. */
export declare const JOURNAL_DECODE_WINDOW = 10000;
/** @deprecated Alias of {@link JOURNAL_DECODE_WINDOW}; kept for census callers. */
export declare const JOURNAL_CACHE_MAX_ROWS = 10000;
export interface JournalCacheMetric {
    type: "journal-cache";
    rowsInFlight: number;
    peakRowsInFlight: number;
    heapUsedMb: number;
    maxRows: number;
}
/** Full-pass heap cap may lower this for the rest of a chore; otherwise the ceiling. */
export declare function activeJournalDecodeWindow(): number;
export declare function setActiveJournalDecodeWindow(size: number): void;
export declare function journalCacheMetric(): JournalCacheMetric;
/** Existing stderr JSON channel: one line, no secrets, numeric decode-window census. */
export declare function emitJournalCacheMetric(write?: (line: string) => void): void;
export declare function noteJournalDecoded(count?: number): void;
export declare function dropJournalDecodeWindow(): void;
export declare function resetJournalDecodeWindowForTest(): void;
export declare function journalFingerprintMatchesStat(fingerprint: JournalEntry | {
    hash: string;
    size: number;
    mtimeMs?: number;
    ctimeMs?: number;
    kind?: "file" | "symlink";
    localDiverges?: boolean;
    removedAt?: string;
    localDeleteIntent?: unknown;
} | undefined, lstat: {
    isFile(): boolean;
    size: number;
    mtimeMs: number;
    ctimeMs: number;
}): boolean;
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