export declare function isRegisteredUserId(id: string | undefined): boolean;
export interface ImActor {
    /** Raw id on the messenger (telegram user id, discord snowflake, …). */
    imUserId: string;
    /** Registered Agim account, when this channel is bound. */
    registeredUserId: string | null;
}
/**
 * Parse an actor string. Accepts raw IM ids, `imId:usr_…`,
 * `platform:imId`, `platform:imId:usr_…`, and bare `usr_…`.
 */
export declare function parseImActor(platform: string | undefined, userId: string | undefined): ImActor;
/** Actor id stored on RouteContext / MessageContext after bind. */
export declare function composeImActor(imUserId: string, registeredUserId: string): string;
/** Full channel key: `telegram:12345:usr_ab12`. */
export declare function imChannelKey(platform: string, imUserId: string, registeredUserId: string): string;
/**
 * Stamp the registered user onto an IM identity when a binding exists.
 * Unbound IM stays the raw messenger id — Agim still works, no account to bill.
 * A client-supplied `:usr_…` suffix is ignored unless a binding confirms it.
 */
export declare function attachRegisteredIdentity(platform: string | undefined, userId: string | undefined): string | undefined;
/** Registered account to bill / scope. Null when this IM channel has no user. */
export declare function registeredUserIdOf(platform: string | undefined, userId: string | undefined): string | null;
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