import type { SourceRef } from './deltas';
/**
 * Extract a normalised SourceRef string from a source object.
 *
 * Handles NMEA 2000 (canName / src), NMEA 0183 (talker), plain string
 * ($source), and missing-source cases.
 */
export declare function getSourceId(source: any): SourceRef;
/**
 * Set the identity field (mmsi, uuid, or url) on a vessel data object
 * based on the identity string format.
 */
export declare function fillIdentityField(vesselData: Record<string, any>, identity: string): void;
/**
 * Iterate all vessels in a full Signal K tree and set identity fields.
 */
export declare function fillIdentity(full: Record<string, any>): void;
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