import { Letter } from '@actor-system/mail/internal';
import { Lookup, Register, Unregister, Subscribe } from '@actor-system/receptionist/command/internal';
export { $lookup, $register, $subscribe, $unregister, Lookup, Register, Subscribe, Unregister, isLookup, isRegister, isSubscribe, isUnregister, lookup, register, subscribe, unregister } from '@actor-system/receptionist/command/internal';
import { Path } from '../__bundle__/shared/dist/path.internal.js';
import { ClusterState } from '../types.internal.js';
import { ActorRegistryUpdate } from '../mail/command.internal.js';
export { $actorRegistryUpdate, actorRegistryUpdate, isActorRegistryUpdate } from '../mail/command.internal.js';

/** @internal */
declare const $clusterStateSync: unique symbol;
/** @internal */
interface ClusterStateSync extends Letter<typeof $clusterStateSync> {
    readonly source: Path.Hostname;
    readonly clusterState: ClusterState;
}
/** @internal */
declare const clusterStateSync: ({ source, clusterState, }: Letter.ExcludeLabel<ClusterStateSync>) => ClusterStateSync;
/** @internal */
declare const isClusterStateSync: (input: unknown) => input is ClusterStateSync;
declare const isCommand: {
    /** @internal */
    <T>(input: unknown): input is Command.Internal<T>;
    <T>(input: unknown): input is Command<T>;
};

type Command<T = unknown> = Lookup<T> | Register<T> | Unregister<T> | Subscribe<T>;
/** @internal */
declare namespace Command {
    /** @internal */
    type Internal<T = unknown> = Lookup<T> | Register<T> | Unregister<T> | Subscribe<T> | ActorRegistryUpdate | ClusterStateSync;
}

export { $clusterStateSync, ActorRegistryUpdate, Command, clusterStateSync, isClusterStateSync, isCommand };
export type { ClusterStateSync };