/**
 * @license
 * Copyright 2022-2026 Matter.js Authors
 * SPDX-License-Identifier: Apache-2.0
 */
import type { Directory } from "../../fs/Directory.js";
import { type WalCommitId, type WalOp } from "./WalCommit.js";
/**
 * Manages the current WAL segment and writes commits.
 */
export declare class WalWriter {
    #private;
    constructor(walDir: Directory, options?: WalWriter.Options);
    /**
     * The segment number currently being written to.
     */
    get currentSegment(): number;
    /**
     * Write a commit to the WAL, returning its commit ID and timestamp.
     */
    write(ops: WalOp[]): Promise<{
        id: WalCommitId;
        ts: number;
    }>;
    /**
     * Close the current file handle.
     */
    close(): Promise<void>;
}
export declare namespace WalWriter {
    interface Options {
        /** Storage name, used in file handle leak diagnostics. */
        name?: string;
        /** Maximum segment size in bytes before rotation. Default 16 MB. */
        maxSegmentSize?: number;
        /** Whether to fsync after each write. Default true. */
        fsync?: boolean;
        /** Called after a segment is rotated, with the closed segment number. */
        onRotate?: (closedSegment: number) => void;
    }
}
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