export interface Message<TPayload = unknown> {
    type: string;
    payload?: TPayload;
}
export type MessageHandler<TPayload = unknown, TResult = unknown> = (message: Message<TPayload>) => TResult;
export interface MessageBus {
    handlerCount: (type: string) => number;
    post: (message: Message) => Promise<unknown[]>;
    postAll: (message: Message[]) => Promise<unknown[]>;
    register: (type: string, handler: MessageHandler) => () => void;
    unregisterAll: (...types: string[]) => void;
}