import type { FlushableRunLedger, RunLedger, RunLedgerDurability } from "./contracts.js";
export declare const DEFAULT_LEDGER_BATCH_ENTRIES = 128;
export declare const HARD_LEDGER_BATCH_ENTRIES = 4096;
export declare const DEFAULT_LEDGER_BATCH_BYTES: number;
export declare const HARD_LEDGER_BATCH_BYTES: number;
export declare const DEFAULT_LEDGER_BATCH_DELAY_MS = 25;
export declare const HARD_LEDGER_BATCH_DELAY_MS = 60000;
export interface BatchedRunLedgerOptions {
    /** Flush triggers, not write grouping: a pending flush fires once the buffer reaches
     *  this many entries. Writes still go to the target one at a time (RunLedger has no
     *  batch append); these bounds shape flush *timing*, not per-write coalescing. */
    readonly maxBatchEntries?: number;
    /** Flush trigger: pending flush fires once buffered bytes reach this bound. */
    readonly maxBatchBytes?: number;
    /** Backpressure bound: enqueue flushes synchronously before exceeding this. */
    readonly maxBufferedEntries?: number;
    /** Backpressure bound (bytes): enqueue flushes synchronously before exceeding this. */
    readonly maxBufferedBytes?: number;
    readonly maxDelayMs?: number;
    readonly durability?: RunLedgerDurability;
}
/**
 * Wrap any RunLedger with one bounded FIFO. Inputs must already be redacted, as required by RunLedger.
 * `buffered` may lose accepted records on process crash; call `flush()` for acknowledgement.
 */
export declare function createBatchedRunLedger(target: RunLedger, options?: BatchedRunLedgerOptions): FlushableRunLedger;
export declare function isFlushableRunLedger(ledger: RunLedger): ledger is FlushableRunLedger;