export interface WhatsAppTarget {
    kind: 'whatsapp';
    senderId: string;
    gatewayUrl: string;
    serverPath: string;
}
export interface WebchatTarget {
    kind: 'webchat';
    key: string;
    gatewayUrl: string;
    serverPath: string;
}
export type ChannelTarget = WhatsAppTarget | WebchatTarget;
/** Per-session bound targets, at most one per kind. */
export interface ChannelTargetSet {
    whatsapp?: WhatsAppTarget;
    webchat?: WebchatTarget;
}
/** Add (or replace) a target of its kind. Pure. */
export declare function mergeTarget(set: ChannelTargetSet, t: ChannelTarget): ChannelTargetSet;
/** The kinds currently bound, in no guaranteed order. */
export declare function targetKinds(set: ChannelTargetSet): Array<ChannelTarget['kind']>;
/** True when ≥2 distinct kinds are bound — the case that needs the unified
 *  server (one reply tool fanning to every target). */
export declare function isMultiTarget(set: ChannelTargetSet): boolean;
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