import { EventEmitter } from 'events';
export interface SourceMetaEntry {
    lastSeen: number;
    pgnInstances?: Record<string, number[]>;
}
export declare class FullSignalK extends EventEmitter {
    root: Record<string, any>;
    self: Record<string, any> | undefined;
    sources: Record<string, any>;
    lastModifieds: Record<string, number>;
    /**
     * Per-source freshness data. Kept off the `sources` tree so that
     * `retrieve()` continues to satisfy the Signal K spec schema
     * (which bans unknown properties under `sources.*.*.n2k`).
     *
     * Key format: `${source.label}.${source.src}` for N2K,
     * `${source.label}.${source.talker || 'XX'}` for NMEA 0183, and
     * `${source.label}` for other sources.
     */
    sourceMeta: Record<string, SourceMetaEntry>;
    constructor(id?: string, _type?: string, defaults?: any);
    retrieve(): Record<string, any>;
    addDelta(delta: Record<string, any>): void;
    updateLastModified(contextKey: string): void;
    pruneContexts(seconds: number): void;
    deleteContext(contextKey: string): void;
    private addUpdates;
    private addUpdate;
    private updateDollarSource;
    private updateSource;
}
//# sourceMappingURL=fullsignalk.d.ts.map