import { SyncDataFlowStatus, SyncPriorityStatus, SyncProgress, SyncStatus, SyncStreamDescription, SyncStreamStatus } from '@powersync/common';
import { CoreSyncStatus } from '../../client/sync/stream/core-instruction.js';
/**
 * The {@link SyncStatus} subset not managed by the Rust client in {@link CoreSyncStatus}.
 *
 * This includes the upload state and JS errors.
 */
export interface JavaScriptSyncState {
    uploading?: boolean;
    downloadError?: Error;
    uploadError?: Error;
}
export declare class SyncStatusSnapshot implements SyncStatus {
    readonly core: CoreSyncStatus | null;
    readonly jsState: JavaScriptSyncState;
    constructor(core: CoreSyncStatus | null, jsState: JavaScriptSyncState);
    get connected(): boolean;
    get connecting(): boolean;
    get downloading(): boolean;
    get uploading(): boolean;
    get downloadError(): Error | undefined;
    get uploadError(): Error | undefined;
    get dataFlowStatus(): SyncDataFlowStatus;
    get lastSyncedAt(): Date | undefined;
    get hasSynced(): boolean | undefined;
    get syncStreams(): SyncStreamStatus[] | undefined;
    forStream(stream: SyncStreamDescription): SyncStreamStatus | undefined;
    get priorityStatusEntries(): SyncPriorityStatus[] | undefined;
    get downloadProgress(): SyncProgress | null;
    statusForPriority(priority: number): SyncPriorityStatus | undefined;
    isEqual(status: SyncStatus): boolean;
    getMessage(): string;
    /**
     * Serializes the SyncStatus instance to a plain object.
     *
     * @returns A plain object representation of the sync status
     */
    toJSON(): SyncStatusJson;
    /**
     * Not all errors are serializable over a MessagePort. E.g. some `DomExceptions` fail to be passed across workers.
     * This explicitly serializes errors in the SyncStatus.
     */
    serializeError(error?: Error): Error | undefined;
}
export interface SyncStatusJson {
    core: CoreSyncStatus | null;
    dataFlow: JavaScriptSyncState;
}