import Database from "better-sqlite3";
import { BathymetrySource } from "../types.js";
import { Readable, Writable } from "stream";
import { ServerAPI } from "@signalk/server-api";
import { Temporal } from "@js-temporal/polyfill";
export declare function createSqliteSource(app: ServerAPI, db: Database.Database): BathymetrySource;
export interface SqliteReaderOptions {
    batchSize?: number;
    from?: Temporal.Instant;
    to?: Temporal.Instant;
}
export declare function createSqliteReader(db: Database.Database, options?: SqliteReaderOptions): Readable | undefined;
export declare function createSqliteWriter(db: Database.Database): Writable;
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