import type { MessageResource } from '../types';
export interface PeopleSystemMessageResource extends MessageResource {
    systemTextFormat: 'people';
    systemTextParts: {
        names: string[];
        overflowCount: number;
        action: string;
    };
    personIdsForSystemEvent: number[];
}
export interface ActorSystemMessageResource extends MessageResource {
    systemTextFormat: 'actor';
    text: string;
}
export type SystemMessageResource = PeopleSystemMessageResource | ActorSystemMessageResource;
export declare const isSystemMessage: (message: MessageResource) => message is SystemMessageResource;
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