类型别名 ConnectionEvents

type ConnectionEvents = {
    close(): void;
    clusterTimeReceived(clusterTime: BSON.Document): void;
    commandFailed(event: CommandFailedEvent): void;
    commandStarted(event: CommandStartedEvent): void;
    commandSucceeded(event: CommandSucceededEvent): void;
    message(message: any): void;
    pinned(pinType: string): void;
    unpinned(pinType: string): void;
}