import { RawQueryResult } from '@powersync/common';
import type { RawWaSqliteDatabaseOptions, RawWebResult } from '../wa-sqlite/RawSqliteConnection.js';
export interface WriteAheadBuffers {
    database: SharedArrayBuffer;
    writeAheadLog: SharedArrayBuffer;
}
export interface WriteAheadState {
    /**
     * Length of the main database file.
     */
    fileSize: number;
    walEnd: number;
    /**
     * A map of database position offsets to offsets in the WAL logs at which position contents of the page are stored.
     */
    overlay: Map<number, WalOverlayEntry>;
}
export interface WalOverlayEntry {
    logOffset: number;
    size: number;
}
export interface WalIndexChange {
    fileSize: number;
    walEnd: number;
    /**
     * New overlay entries to add, encoded as (key, value) pairs of {@link WriteAheadState.overlay}.
     */
    added: (number | WalOverlayEntry)[];
    /**
     * Whether to clear the overlay (meaning that we ran a checkpoint).
     */
    cleared: boolean;
}
export interface DatabaseServer {
    /**
     * Open a database connection from the given database and write-ahead log buffers.
     */
    open(buffers: WriteAheadBuffers, options: Partial<RawWaSqliteDatabaseOptions>): Promise<void>;
    /**
     * Push new wal changes to this worker.
     */
    updateWalState(overlay: WalIndexChange): Promise<void>;
    executeRaw(query: string, params?: any[] | undefined): Promise<RawQueryResult>;
    executeBatch(query: string, params?: any[][] | undefined): Promise<RawWebResult[]>;
    /**
     * Takes WAL changes made by this worker during its active write iteration.
     */
    takeWalChanges(): Promise<WalIndexChange>;
}
export declare function emptyWalState(): WriteAheadState;
export declare function applyWalChanges(state: WriteAheadState, changes: WalIndexChange): void;