import { IMembershipEntity } from "./IPuripara";
import ActionCable from "./ActionCable";
export default class Helper {
    static membershipsToChannelIds(memberships: IMembershipEntity[]): string[];
    static membershipsToChannelIdByChannelName(memberships: IMembershipEntity[], targetChannelName: string): string | undefined;
    static subscribeChatChannelByChannelIds(stream: ActionCable, channelIds: string[]): void;
}