export interface RemoteSource {
    label?: string;
    type?: string;
    canName?: string;
    src?: string | number;
    talker?: string;
    [key: string]: unknown;
}
export interface RemoteUpdate {
    $source?: string;
    source?: RemoteSource;
    [key: string]: unknown;
}
/**
 * Decide whether a remote delta update already identifies its source
 * well enough for the local server to reuse that identity. Used to
 * decide whether we need to stamp a fallback $source.
 *
 * The goal is transport-agnostic device identity: a Maretron seen via
 * local YDEN02 and the same Maretron seen via a remote Signal K server
 * should resolve to the same CAN Name. If the remote preserves a
 * canName / src / talker / label in its source object, or ships a
 * $source string directly, we keep that intact.
 */
export declare function hasIdentifiableSource(update: RemoteUpdate): boolean;
/**
 * Stamp a fallback $source on each remote update that lacks identity,
 * leaving identified updates untouched.
 */
export declare function stampRemoteUpdates(updates: RemoteUpdate[], fallbackSourceRef: string): void;
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